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<document ID-DOI="10.1093/zoolinnean/zlac016" ID-GBIF-Dataset="c84845b6-8c32-41c3-bfb5-b7c203812353" ID-ISSN="0024-4082" ID-Zenodo-Dep="7323790" ID-ZooBank="FAC815A5-0D0B-4F5B-A012-DC59DD4E6AD5" checkinTime="1668420766006" checkinUser="plazi" docAuthor="Pardiñas, Ulyses F. J., Tinoco, Nicolás, Barbière, Franck, Ronez, Christophe, Cañón, Carola, Lessa, Gisele, Koch, Claudia &amp; Brito, Jorge" docDate="2022" docId="836387C5FFCC95738161FA22FACAFA1E" docLanguage="en" docName="zlac016.pdf" docOrigin="Zoological Journal of the Linnean Society 196" docSource="https://doi.org/10.1093/zoolinnean/zlac016" docStyle="DocumentStyle:36B3BD6A90C22AB4F7F465C853188CC8.7:ZoolJLinnSoc.2017-.journal_article" docStyleId="36B3BD6A90C22AB4F7F465C853188CC8" docStyleName="ZoolJLinnSoc.2017-.journal_article" docStyleVersion="7" docTitle="Rhagomyini Pardiñas &amp; Tinoco &amp; Barbière &amp; Ronez &amp; Cañón &amp; Lessa &amp; Koch &amp; Brito 2022, TRIB. NOV." docType="treatment" docVersion="2" lastPageNumber="1028" masterDocId="7F5AFFBDFFC7957C8023FFE0FFC5FFC1" masterDocTitle="Morphological disparity in a hyperdiverse mammal clade: a new morphotype and tribe of Neotropical cricetids" masterLastPageNumber="1038" masterPageNumber="1013" pageNumber="1024" updateTime="1668523345043" updateUser="ExternalLinkService">
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<mods:title>Morphological disparity in a hyperdiverse mammal clade: a new morphotype and tribe of Neotropical cricetids</mods:title>
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<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Pardiñas, Ulyses F. J.</mods:namePart>
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<mods:namePart>Tinoco, Nicolás</mods:namePart>
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<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Barbière, Franck</mods:namePart>
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<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Ronez, Christophe</mods:namePart>
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<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Cañón, Carola</mods:namePart>
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<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Lessa, Gisele</mods:namePart>
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<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Koch, Claudia</mods:namePart>
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<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Brito, Jorge</mods:namePart>
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<mods:title>Zoological Journal of the Linnean Society</mods:title>
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<mods:date>2022</mods:date>
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<mods:number>2022-04-29</mods:number>
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<heading box="[322,619,1474,1498]" centered="true" fontSize="9" level="2" pageId="11" pageNumber="1024" reason="3">
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<taxonomicName authority="Pardiñas &amp; Tinoco &amp; Barbière &amp; Ronez &amp; Cañón &amp; Lessa &amp; Koch &amp; Brito, 2022" authorityName="Pardiñas &amp; Tinoco &amp; Barbière &amp; Ronez &amp; Cañón &amp; Lessa &amp; Koch &amp; Brito" authorityYear="2022" box="[322,479,1474,1498]" class="Mammalia" family="Cricetidae" kingdom="Animalia" order="Rodentia" pageId="11" pageNumber="1024" phylum="Chordata" rank="tribe" status="TRIB. NOV." tribe="Rhagomyini">RHAGOMYINI</taxonomicName>
,
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<taxonomicNameLabel box="[493,619,1474,1498]" pageId="11" pageNumber="1024" rank="tribe">TRIB. NOV.</taxonomicNameLabel>
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<subSubSection pageId="11" pageNumber="1024" type="description">
<paragraph blockId="11.[390,551,1513,1538]" box="[390,551,1513,1538]" pageId="11" pageNumber="1024">
(
<figureCitation box="[399,501,1513,1538]" captionStart-0="Figure 2" captionStart-1="Figure 3" captionStart-2="Figure 4" captionStart-3="Figure 5" captionStart-4="Figure 6" captionStart-5="Figure 7" captionStart-6="Figure 8" captionStart-7="Figure 9" captionStartId-0="5.[164,242,1790,1812]" captionStartId-1="6.[145,226,1163,1185]" captionStartId-2="7.[164,242,1008,1030]" captionStartId-3="9.[163,247,1249,1271]" captionStartId-4="10.[145,225,745,767]" captionStartId-5="11.[164,246,1132,1154]" captionStartId-6="12.[142,221,859,881]" captionStartId-7="13.[163,242,1158,1180]" captionTargetBox-0="[164,1425,1076,1751]" captionTargetBox-1="[146,1416,196,1123]" captionTargetBox-2="[324,1282,196,967]" captionTargetBox-3="[324,1283,196,1209]" captionTargetBox-4="[145,1425,195,705]" captionTargetBox-5="[165,1444,197,1091]" captionTargetBox-6="[305,1265,195,819]" captionTargetBox-7="[280,1330,204,1115]" captionTargetId-0="figure-470@5.[163,1443,1065,1751]" captionTargetId-1="figure-256@6.[145,1425,195,1123]" captionTargetId-2="figure-390@7.[323,1283,195,968]" captionTargetId-3="figure-256@9.[323,1283,195,1210]" captionTargetId-4="figure-533@10.[145,1425,195,705]" captionTargetId-5="figure-274@11.[163,1446,195,1093]" captionTargetId-6="figure-531@12.[305,1265,195,819]" captionTargetId-7="figure-328@13.[264,1342,195,1118]" captionTargetPageId-0="5" captionTargetPageId-1="6" captionTargetPageId-2="7" captionTargetPageId-3="9" captionTargetPageId-4="10" captionTargetPageId-5="11" captionTargetPageId-6="12" captionTargetPageId-7="13" captionText-0="Figure 2. Selected features of the external morphology of Rhagomys: A, tail basally furred (f) of R. septentrionalis (MEPN 10898, holotype; dry skin in dorsal view); B, C, halluctal nails of R. rufescens (B; MZUFV-CM 3706) and R. septentrionalis (C; MECN 6172); D, frontal view of manal digit calluses of R. septentrionalis (MECN 6172); E, F, ventral view of right fore (E) and hind foot (F) of R. septentrionalis (MECN 6172). Abbreviations: dg, transverse digit grooves; h, hallux; p, pollex." captionText-1="Figure 3. Selected anatomical traits and regions in the cranium of Rhagomys: A, lateral left view of the cranium of R. septentrionalis (MEPN 10898): note the position of the mastoid (mc) well above the basal plane (indicated by the yellow horizontal line); B, lateral view of the left otic region of R. rufescens (MZUFV-CM 3706); C, ventral view of basicranial region of R. septentrionalis (MECN 6172); D, dorsal view (roofing bones of braincase removed) of basicranial region of R. septentrionalis (MEPN 10898); E, cross-section of the cranium of R. septentrionalis (MEPN 10898) at the frontal sinuses plane. Abbreviations: bs, basisphenoid; bo, basioccipital; f, fontanelle; fo, foramen ovale; m, foramen magnum; etI, ethmoturbinal I; etII, ethmoturbinal II; etIII, ethmoturbinal III; ft1, frontoturbinal 1; ft2, frontoturbinal 2; it, interturbinal; ls, lamina semicircularis; ps, presphenoid. Except for B the pictures are three-dimensional reconstructions based on micro-CT data." captionText-2="Figure 4. Mandible morphology of Rhagomys: A, external view of the left hemimandible of R. longilingua (FMNH 170687): note the chin process (c) and the straight inner border (b); B, external view of the left hemimandible of R. septentrionalis (MECN 6172); C, medial view of the left hemimandible of R. septentrionalis (MECN 6172); D, dorsolateral view of the retromolar fossa in the left hemimandible of R. septentrionalis (MECN 6172); E, lingual dorsolateral view of the retromolar fossa in the left hemimandible of R. rufescens (MZUFV-CM 3706): note the elevated bony ridge (mi) forming the caudad close of the fossa. Except for A and E the pictures are three-dimensional reconstructions based on micro-CT data." captionText-3="Figure 5. Incisor external appearance and morphology of Rhagomys: A, labial view of the left lower incisor of R. septentrionalis (MECN 6172): note the thick band of enamel (e) compared to dentine (d); B, ventral view of the left lower incisor of R. septentrionalis (MECN 6172): note the tenues groove (g); C, frontal view of both upper incisors of R. rufescens (MZUFV-CM 3706): note the inverted v shape of the cutting edge (broken line) and the flattened anterior faces medially inclined (arrows); DF, ventral view of the left lower incisor of R. rufescens (MZUFV-CM 3706): note the textured surface. A and B are three-dimensional reconstructions based on micro-CT data." captionText-4="Figure 6. Unique tubercular hypsodonty in Rhagomys exemplified by R. septentrionalis (MECN 6172): right upper (A, C) and lower (B, D) molar series viewed from behind (A, B) and the labial side (C, D). The pictures are three-dimensional reconstructions based on micro-CT data." captionText-5="Figure 7. ICAMER system applied on the right first upper (upper row) and lower (lower row) molar of Rhagomys rufescens (MZUFV-CM 3706). Schematic cuspal units employed differential colours to highlight component structures (arms and projections). Abbreviations: upper molar: alb, anterolabial conule; alg, anterolingual conule; am, anterior mure; anf, anteromedian flexus; ant, anteroloph; hyf, hypoflexus; hyp, hypocone; mef, metaflexus; met, metacone; mm, median mure; msf, mesoflexus; msp, mesoloph; paf, paraflexus; pal, paraloph; par, paracone; pof, posteroflexus; pol, posteroloph; prf, protoflexus; pro, protocone. Lower molar: amd, anterior murid; cg, anterolabial cingulum; enfd, entoflexid; ent, entoconid; entl, entolophid; hyfd, hypoflexid; lgd, anterolingual conulid; med, metaconid; mefd, metaflexid; metl, metalophid; mmd, median murid; msd, mesolophid; msfd, mesoflexid; pod, posterolophid; pofd, posteroflexid; prd, protoconid." captionText-6="Figure 8. Topological comparison of the left first molar of A, Rhagomys (R. rufescens; MZUFV-CM 3706); B, Thomasomys (T.aureus; CNP 6471); C, Wilfredomys (W.oenax; CNP 2378) and the left second molar of D, Delomys (D.sublineatus; UFSC711)." captionText-7="Figure 9. Selected soft anatomical traits of Rhagomys: A, dorsal view of the tongue in R. septentrionalis (MEPN 12715); B, caecal portion of the intestine in R. rufescens (MZUFV-CM 3706); C, soft palate in R. septentrionalis (MECN 6172); D, external (left) and internal (right) view of the stomach in R. rufescens (MZUFV-CM 3706); E, frontal view of the rhinarium in R. rufescens (right panel; MZUSP 33890) and R. septentrionalis (left panel; MECN 6172). Abbreviations: a, alanasi; ce, caecum; co, colon; cv, circumvallate papilla; d, diastemal ridge; es, esophagus; i, interdental ridge; il, ileum; n, nasal pad; p, basal fold; ph, philtrum; py, pylorous." figureDoi-0="http://doi.org/10.5281/zenodo.7323794" figureDoi-1="http://doi.org/10.5281/zenodo.7323796" figureDoi-2="http://doi.org/10.5281/zenodo.7323800" figureDoi-3="http://doi.org/10.5281/zenodo.7323802" figureDoi-4="http://doi.org/10.5281/zenodo.7323804" figureDoi-5="http://doi.org/10.5281/zenodo.7323806" figureDoi-6="http://doi.org/10.5281/zenodo.7323810" figureDoi-7="http://doi.org/10.5281/zenodo.7323812" httpUri-0="https://zenodo.org/record/7323794/files/figure.png" httpUri-1="https://zenodo.org/record/7323796/files/figure.png" httpUri-2="https://zenodo.org/record/7323800/files/figure.png" httpUri-3="https://zenodo.org/record/7323802/files/figure.png" httpUri-4="https://zenodo.org/record/7323804/files/figure.png" httpUri-5="https://zenodo.org/record/7323806/files/figure.png" httpUri-6="https://zenodo.org/record/7323810/files/figure.png" httpUri-7="https://zenodo.org/record/7323812/files/figure.png" pageId="11" pageNumber="1024">FIGS 29</figureCitation>
,
<figureCitation box="[515,543,1513,1538]" captionStart="Figure 11" captionStartId="15.[162,240,1174,1196]" captionTargetBox="[323,1281,197,1133]" captionTargetId="figure-264@15.[322,1282,196,1134]" captionTargetPageId="15" captionText="Figure 11. Selected cranial details in Rhagomys rufescens (all based on MZUFV-CM 3706): A, laterodorsal view of the left temporal region showing the alisphenoid strut (as); B, lateral view of the anterior part of the cranium to show the broad zygomatic plate (note also the staggered incisor profile highlighted by an arrow); C, left zygomatic plate ventrally viewed to put in evidence the thick posterior border (pb) transversally oriented and the point (marked with an arrow) where the shaft twist; D, lateroventral view of the occipital region showing a large foramen magnum (fm), the left mastoid capsule (mc) and the ventral appearance of a prominent petrosal (pe)." figureDoi="http://doi.org/10.5281/zenodo.7323816" httpUri="https://zenodo.org/record/7323816/files/figure.png" pageId="11" pageNumber="1024">11</figureCitation>
)
</paragraph>
<paragraph blockId="11.[163,780,1553,1606]" pageId="11" pageNumber="1024">
<emphasis box="[163,496,1553,1575]" italics="true" pageId="11" pageNumber="1024">Z o o b a n k r e g i s t r a t i o n:</emphasis>
u r n: l s i d: z o o b a n k. org:act:
<uuid box="[239,765,1584,1606]" pageId="11" pageNumber="1024">BFA3F94-5A18-4AAF-AD22-3A466DDB5005</uuid>
.
</paragraph>
</subSubSection>
<subSubSection box="[163,596,1647,1669]" pageId="11" pageNumber="1024" type="type_taxon">
<paragraph blockId="11.[163,596,1647,1669]" box="[163,596,1647,1669]" pageId="11" pageNumber="1024">
<emphasis box="[163,295,1647,1668]" italics="true" pageId="11" pageNumber="1024">
<typeStatus box="[163,216,1647,1668]" pageId="11" pageNumber="1024">Type</typeStatus>
genus:
</emphasis>
<taxonomicName authority="Thomas, 1917" authorityName="Thomas" authorityYear="1917" box="[307,589,1647,1669]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="11" pageNumber="1024" phylum="Chordata" rank="genus">
<emphasis box="[307,425,1647,1668]" italics="true" pageId="11" pageNumber="1024">Rhagomys</emphasis>
<bibRefCitation author="Thomas O" box="[431,589,1647,1669]" pageId="11" pageNumber="1024" pagination="192 - 198" refId="ref19299" refString="Thomas O. 1917. On the arrangement of the South American rats allied to Oryzomys and Rhipidomys. Annals and Magazine of Natural History; Zoology, Botany, and Geology 20: 192 - 198." type="journal article" year="1917">Thomas, 1917</bibRefCitation>
</taxonomicName>
.
</paragraph>
</subSubSection>
<subSubSection lastPageId="12" lastPageNumber="1025" pageId="11" pageNumber="1024" type="diagnosis">
<paragraph blockId="11.[163,779,1707,1882]" lastBlockId="12.[145,762,949,1124]" lastPageId="12" lastPageNumber="1025" pageId="11" pageNumber="1024">
<emphasis box="[163,287,1707,1728]" italics="true" pageId="11" pageNumber="1024">Diagnosis:</emphasis>
A tribe of the subfamily
<taxonomicName authorityName="WAGNER" authorityYear="1843" box="[595,774,1707,1729]" class="Mammalia" family="Cricetidae" kingdom="Animalia" order="Rodentia" pageId="11" pageNumber="1024" phylum="Chordata" rank="subFamily" subFamily="Sigmodontinae">Sigmodontinae</taxonomicName>
, clade Oryzomyalia, grouping small-sized cricetids (head and body length ~
<quantity box="[464,636,1768,1789]" metricMagnitude="-2" metricUnit="m" metricValue="9.5" metricValueMax="10.0" metricValueMin="9.0" pageId="11" pageNumber="1024" unit="mm" value="95.0" valueMax="100.0" valueMin="90.0">90 to 100 mm</quantity>
; body mass ~
<quantity box="[177,305,1798,1820]" metricMagnitude="-2" metricUnit="kg" metricValue="2.75" metricValueMax="3.5" metricValueMin="2.0" pageId="11" pageNumber="1024" unit="g" value="27.5" valueMax="35.0" valueMin="20.0">20 to 35 g</quantity>
) uniquely diagnosed by the following traits: all digits with deep, transverse grooves; tips of manual digits callused and having a crescent-shaped depression appearing heart-shaped in dorsal view with embedded minute claws; nail (as opposed to a claw) on the hallux; elongated pedal digit V, which reaches the middle of the second phalanx of digit IV; cranium with marked basicranial flexure involving a low emplacement of the mastoid bulla; true fossa occupying the retromolar region developed laterally to m2-m3; completely planed ventral surface to the dentary; pro-odont, smoothly grooved lower incisor showing faintly textured enamel; molars with conspicuous persistently enamelled and conical main cusps connected by thin ridges; anteroconid of m1 composed of a single conulid (as opposed to two conulids) connected to the protoconid and with direct connection between protoconid and hypoconid; tongue unusually long, narrow and cylindrical, lacking both the torus linguae and the sulcus semilunaris (the latter two features presumed in
<taxonomicName baseAuthorityName="Thomas" baseAuthorityYear="1886" box="[517,654,979,1001]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="12" pageNumber="1025" phylum="Chordata" rank="species" species="rufescens">
<emphasis box="[517,654,979,1001]" italics="true" pageId="12" pageNumber="1025">R. rufescens</emphasis>
</taxonomicName>
); filiform caecum with the external diameter equal to that of the adjacent portion of the colon (after
<bibRefCitation author="Thomas O" box="[595,754,1041,1063]" pageId="12" pageNumber="1025" pagination="192 - 198" refId="ref19299" refString="Thomas O. 1917. On the arrangement of the South American rats allied to Oryzomys and Rhipidomys. Annals and Magazine of Natural History; Zoology, Botany, and Geology 20: 192 - 198." type="journal article" year="1917">Thomas, 1917</bibRefCitation>
;
<bibRefCitation author="Luna L &amp; Patterson BD" box="[145,415,1072,1093]" pageId="12" pageNumber="1025" pagination="1 - 24" refId="ref16780" refString="Luna L, Patterson BD. 2003. A remarkable new mouse (Muridae: Sigmodontinae) from southeastern Peru: with comments on the affinities of Rhagomys rufescens (Thomas, 1886). Fieldiana Zoology 101: 1 - 24." type="journal article" year="2003">Luna &amp; Patterson, 2003</bibRefCitation>
;
<bibRefCitation author="Percequillo AR &amp; Goncalves PR &amp; de Oliveira JA" box="[427,682,1071,1093]" pageId="12" pageNumber="1025" pagination="238 - 257" refId="ref17903" refString="Percequillo AR, Goncalves PR, de Oliveira JA. 2004. The rediscovery of Rhagomys rufescens (Thomas, 1886), with a morphological redescription and comments on its systematic relationships based on morphological and molecular (cytochrome b) characters. Mammalian Biology 69: 238 - 257." type="journal article" year="2004">
Percequillo
<emphasis box="[560,616,1071,1093]" italics="true" pageId="12" pageNumber="1025">et al.</emphasis>
, 2004
</bibRefCitation>
;
<bibRefCitation author="Luna L" pageId="12" pageNumber="1025" pagination="580 - 583" refId="ref16734" refString="Luna L. 2015. Genus Rhagomys Thomas, 1886. In: Patton JL, Pardinas UFJ, D'Elia G, eds. Mammals of South America, Vol. 2. Rodents. Chicago: University of Chicago Press, 580 - 583." type="book chapter" year="2015">Luna, 2015</bibRefCitation>
; this paper).
</paragraph>
</subSubSection>
<caption ID-DOI="http://doi.org/10.5281/zenodo.7323810" ID-Zenodo-Dep="7323810" httpUri="https://zenodo.org/record/7323810/files/figure.png" pageId="12" pageNumber="1025" startId="12.[142,221,859,881]" targetBox="[305,1265,195,819]" targetPageId="12">
<paragraph blockId="12.[142,1427,859,911]" pageId="12" pageNumber="1025">
<emphasis bold="true" box="[142,247,859,881]" pageId="12" pageNumber="1025">Figure 8.</emphasis>
Topological comparison of the left first molar of A,
<taxonomicName authorityName="Thomas" authorityYear="1917" box="[794,903,859,881]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="12" pageNumber="1025" phylum="Chordata" rank="genus">
<emphasis box="[794,903,859,881]" italics="true" pageId="12" pageNumber="1025">Rhagomys</emphasis>
</taxonomicName>
(
<taxonomicName baseAuthorityName="Thomas" baseAuthorityYear="1886" box="[917,1042,859,881]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="12" pageNumber="1025" phylum="Chordata" rank="species" species="rufescens">
<emphasis box="[917,1042,859,881]" italics="true" pageId="12" pageNumber="1025">R. rufescens</emphasis>
</taxonomicName>
; MZUFV-CM 3706); B,
<taxonomicName authorityName="Coues" authorityYear="1884" box="[1288,1425,859,881]" class="Mammalia" family="Cricetidae" genus="Thomasomys" kingdom="Animalia" order="Rodentia" pageId="12" pageNumber="1025" phylum="Chordata" rank="genus">
<emphasis box="[1288,1425,859,881]" italics="true" pageId="12" pageNumber="1025">Thomasomys</emphasis>
</taxonomicName>
(
<taxonomicName baseAuthorityName="Tomes" baseAuthorityYear="1860" box="[152,245,889,910]" class="Mammalia" family="Cricetidae" genus="Thomasomys" kingdom="Animalia" order="Rodentia" pageId="12" pageNumber="1025" phylum="Chordata" rank="species" species="aureus">
<emphasis box="[152,245,889,910]" italics="true" pageId="12" pageNumber="1025">T. aureus</emphasis>
</taxonomicName>
; CNP 6471); C,
<taxonomicName authorityName="Avila-Pires" authorityYear="1960" box="[400,528,889,911]" class="Mammalia" family="Cricetidae" genus="Wilfredomys" kingdom="Animalia" order="Rodentia" pageId="12" pageNumber="1025" phylum="Chordata" rank="genus">
<emphasis box="[400,528,889,911]" italics="true" pageId="12" pageNumber="1025">Wilfredomys</emphasis>
</taxonomicName>
(
<taxonomicName baseAuthorityName="CNP" baseAuthorityYear="2378" box="[540,626,889,910]" class="Mammalia" family="Cricetidae" genus="Wilfredomys" kingdom="Animalia" order="Rodentia" pageId="12" pageNumber="1025" phylum="Chordata" rank="species" species="oenax">
<emphasis box="[540,626,889,910]" italics="true" pageId="12" pageNumber="1025">W. oenax</emphasis>
</taxonomicName>
; CNP 2378) and the left second molar of D,
<taxonomicName authorityName="Thomas" authorityYear="1917" box="[1059,1146,889,911]" class="Mammalia" family="Cricetidae" genus="Delomys" kingdom="Animalia" order="Rodentia" pageId="12" pageNumber="1025" phylum="Chordata" rank="genus">
<emphasis box="[1059,1146,889,911]" italics="true" pageId="12" pageNumber="1025">Delomys</emphasis>
</taxonomicName>
(
<taxonomicName baseAuthorityName="Thomas" baseAuthorityYear="1903" box="[1158,1302,889,911]" class="Mammalia" family="Cricetidae" genus="Delomys" kingdom="Animalia" order="Rodentia" pageId="12" pageNumber="1025" phylum="Chordata" rank="species" species="sublineatus">
<emphasis box="[1158,1302,889,911]" italics="true" pageId="12" pageNumber="1025">D. sublineatus</emphasis>
</taxonomicName>
; UFSC711).
</paragraph>
</caption>
<subSubSection pageId="12" pageNumber="1025" type="discussion">
<paragraph blockId="12.[145,762,1165,1217]" pageId="12" pageNumber="1025">
<emphasis box="[145,246,1165,1186]" italics="true" pageId="12" pageNumber="1025">Content:</emphasis>
A single genus,
<taxonomicName authority="Thomas, 1917: 192" authorityName="Thomas" authorityPageNumber="192" authorityYear="1917" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="12" pageNumber="1025" phylum="Chordata" rank="genus">
<emphasis box="[454,578,1165,1186]" italics="true" pageId="12" pageNumber="1025">Rhagomys</emphasis>
<bibRefCitation author="Thomas O" pageId="12" pageNumber="1025" pagination="192 - 198" refId="ref19299" refString="Thomas O. 1917. On the arrangement of the South American rats allied to Oryzomys and Rhipidomys. Annals and Magazine of Natural History; Zoology, Botany, and Geology 20: 192 - 198." type="journal article" year="1917">Thomas, 1917: 192</bibRefCitation>
</taxonomicName>
.
</paragraph>
</subSubSection>
<subSubSection pageId="12" pageNumber="1025" type="distribution">
<paragraph blockId="12.[145,761,1258,1556]" pageId="12" pageNumber="1025">
<emphasis box="[145,448,1258,1279]" italics="true" pageId="12" pageNumber="1025">Geographic distribution:</emphasis>
<taxonomicName authority="Pardiñas &amp; Tinoco &amp; Barbière &amp; Ronez &amp; Cañón &amp; Lessa &amp; Koch &amp; Brito, 2022" authorityName="Pardiñas &amp; Tinoco &amp; Barbière &amp; Ronez &amp; Cañón &amp; Lessa &amp; Koch &amp; Brito" authorityYear="2022" box="[462,609,1258,1280]" class="Mammalia" family="Cricetidae" kingdom="Animalia" order="Rodentia" pageId="12" pageNumber="1024" phylum="Chordata" rank="tribe" status="TRIB. NOV." tribe="Rhagomyini">Rhagomyini</taxonomicName>
rodents are distributed extensively in tropical South America in two main cores divided by the Arid Diagonal [see map provided by
<bibRefCitation author="Moreno Cardenas PA &amp; Tinoco N &amp; Albuja L &amp; Patterson BD" box="[371,753,1350,1372]" pageId="12" pageNumber="1025" pagination="123 - 138" refId="ref17035" refString="Moreno Cardenas PA, Tinoco N, Albuja L, Patterson BD. 2021. A new species of Rhagomys (Rodentia, Sigmodontinae) from southeastern Ecuador. Journal of Mammalogy 102: 123 - 138." type="journal article" year="2021">
Moreno Cárdenas
<emphasis box="[607,672,1350,1372]" italics="true" pageId="12" pageNumber="1025">et al.</emphasis>
(2021
</bibRefCitation>
: fig. 1) for details]: eastern Andean montane forests, typically above
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a.s.l., from southern
<collectingCountry box="[659,756,1411,1433]" name="Ecuador" pageId="12" pageNumber="1025">Ecuador</collectingCountry>
, through
<collectingCountry box="[246,301,1443,1464]" name="Peru" pageId="12" pageNumber="1025">Peru</collectingCountry>
to northern
<collectingCountry box="[449,531,1442,1464]" name="Bolivia" pageId="12" pageNumber="1025">Bolivia</collectingCountry>
and in the Atlantic Interior Forest in
<collectingCountry box="[357,431,1473,1495]" name="Brazil" pageId="12" pageNumber="1025">Brazil</collectingCountry>
. Two isolated records in the Amazonian basin south of the Amazon River in
<collectingCountry box="[691,761,1503,1525]" name="Brazil" pageId="12" pageNumber="1025">Brazil</collectingCountry>
are also known (
<figureCitation box="[332,408,1534,1556]" captionStart="Figure 10" captionStartId="14.[145,227,1058,1080]" captionTargetBox="[148,756,197,1017]" captionTargetId="figure-717@14.[147,758,195,1018]" captionTargetPageId="14" captionText="Figure 10. Rhagomyini: current schematic geographic range in South America." figureDoi="http://doi.org/10.5281/zenodo.7323814" httpUri="https://zenodo.org/record/7323814/files/figure.png" pageId="12" pageNumber="1025">Fig. 10</figureCitation>
).
</paragraph>
</subSubSection>
<subSubSection box="[145,762,1597,1619]" pageId="12" pageNumber="1025" type="description">
<paragraph blockId="12.[145,762,1597,1619]" box="[145,762,1597,1619]" pageId="12" pageNumber="1025">
<heading box="[145,762,1597,1619]" centered="true" fontSize="9" level="2" pageId="12" pageNumber="1025" reason="2">
<emphasis box="[145,254,1597,1618]" italics="true" pageId="12" pageNumber="1025">Biochron:</emphasis>
Recent in
<collectingCountry box="[378,460,1597,1619]" name="Bolivia" pageId="12" pageNumber="1025">Bolivia</collectingCountry>
,
<collectingCountry box="[470,542,1597,1619]" name="Brazil" pageId="12" pageNumber="1025">Brazil</collectingCountry>
,
<collectingCountry box="[552,647,1597,1619]" name="Ecuador" pageId="12" pageNumber="1025">Ecuador</collectingCountry>
and
<collectingCountry box="[701,758,1597,1618]" name="Peru" pageId="12" pageNumber="1025">Peru</collectingCountry>
.
</heading>
</paragraph>
</subSubSection>
<subSubSection lastPageId="15" lastPageNumber="1028" pageId="12" pageNumber="1025" type="discussion">
<paragraph blockId="12.[145,761,1659,1896]" lastBlockId="12.[809,1426,949,1890]" pageId="12" pageNumber="1025">
<emphasis box="[145,475,1659,1681]" italics="true" pageId="12" pageNumber="1025">Other morphological traits:</emphasis>
Taxonomic uniqueness promoted a detailed morphological description in
<taxonomicName authorityName="Thomas" authorityYear="1917" box="[145,267,1721,1742]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="12" pageNumber="1025" phylum="Chordata" rank="genus">
<emphasis box="[145,267,1721,1742]" italics="true" pageId="12" pageNumber="1025">Rhagomys</emphasis>
</taxonomicName>
, paradoxically surpassing in this respect most of the other members of the subfamily. Although hampered by the scarcity of available specimens, which produces an inevitable poor control on trait variability, most of the anatomical fields traditionally scrutinized have been reviewed for this rodent (e.g.
<bibRefCitation author="Luna L &amp; Patterson BD" box="[809,1081,949,970]" pageId="12" pageNumber="1025" pagination="1 - 24" refId="ref16780" refString="Luna L, Patterson BD. 2003. A remarkable new mouse (Muridae: Sigmodontinae) from southeastern Peru: with comments on the affinities of Rhagomys rufescens (Thomas, 1886). Fieldiana Zoology 101: 1 - 24." type="journal article" year="2003">Luna &amp; Patterson, 2003</bibRefCitation>
;
<bibRefCitation author="Percequillo AR &amp; Goncalves PR &amp; de Oliveira JA" box="[1094,1351,949,971]" pageId="12" pageNumber="1025" pagination="238 - 257" refId="ref17903" refString="Percequillo AR, Goncalves PR, de Oliveira JA. 2004. The rediscovery of Rhagomys rufescens (Thomas, 1886), with a morphological redescription and comments on its systematic relationships based on morphological and molecular (cytochrome b) characters. Mammalian Biology 69: 238 - 257." type="journal article" year="2004">
Percequillo
<emphasis box="[1228,1276,949,970]" italics="true" pageId="12" pageNumber="1025">et al</emphasis>
., 2004
</bibRefCitation>
,
<bibRefCitation author="Percequillo AR &amp; Dalapicolla J &amp; Abreu-Junior EF &amp; Roth PRO &amp; Ferraz KMPMB &amp; Chiquito EA" box="[1364,1419,949,970]" pageId="12" pageNumber="1025" pagination="4071" refId="ref18003" refString="Percequillo AR, Dalapicolla J, Abreu-Junior EF, Roth PRO, Ferraz KMPMB, Chiquito EA. 2017. How many species of mammals are there in Brazil? New records of rare rodents (Rodentia: Cricetidae: Sigmodontinae) from Amazonia raise the current known diversity. PeerJ 5: e 4071." type="journal article" year="2017">2017</bibRefCitation>
;
<bibRefCitation author="Pinheiro PS &amp; Hartmann PA &amp; Geise L" box="[809,1061,979,1001]" pageId="12" pageNumber="1025" pagination="1 - 11" refId="ref18162" refString="Pinheiro PS, Hartmann PA, Geise L. 2004. New record of Rhagomys rufescens (Thomas 1886) (Rodentia: Muridae: Sigmodontinae) in the Atlantic forest of southeastern Brazil. Zootaxa 431: 1 - 11." type="journal article" year="2004">
Pinheiro
<emphasis box="[924,986,979,1001]" italics="true" pageId="12" pageNumber="1025">et al.</emphasis>
, 2004
</bibRefCitation>
;
<bibRefCitation author="de Abreu-Junior EF &amp; Percequillo AR" pageId="12" pageNumber="1025" pagination="1 - 116" refId="ref14713" refString="de Abreu-Junior EF, Percequillo AR. 2019. Small mammals of the Estacao Ecologica de Bananal, southeastern Atlantic Forest, Brazil, with description of a new species of Brucepattersonius (Rodentia, Sigmodontinae). Arquivos de Zoologia 50: 1 - 116." type="journal article" year="2019">Abreu-Júnior &amp; Percequillo, 2019</bibRefCitation>
).
</paragraph>
<paragraph blockId="12.[809,1426,949,1890]" lastBlockId="13.[827,1444,1365,1908]" lastPageId="13" lastPageNumber="1026" pageId="12" pageNumber="1025">
From external morphology, almost nothing can be added to the general knowledge of the genus. According to published measurements, the ratio of head and body length to tail length is nearly
<quantity box="[1171,1216,1133,1155]" metricMagnitude="-2" metricUnit="m" metricValue="2.54" pageId="12" pageNumber="1025" unit="in" value="1.0">1 in</quantity>
adult specimens; rarely does the caudal length exceed the body length by more than
<quantity box="[966,1044,1194,1215]" metricMagnitude="-2" metricUnit="m" metricValue="1.0" pageId="12" pageNumber="1025" unit="mm" value="10.0">10 mm</quantity>
and in some specimens the latter is slightly longer than the former. Not unexpectedly, some juveniles show markedly longer tails (
<bibRefCitation author="Medina CE &amp; Diaz DR &amp; Pino K &amp; Pari A &amp; Zeballos H" pageId="12" pageNumber="1025" pagination="21361 - 21367" refId="ref16915" refString="Medina CE, Diaz DR, Pino K, Pari A, Zeballos H. 2017. New locality records of Rhagomys longilingua Luna &amp; Patterson, 2003 (Rodentia: Cricetidae) in Peru. Check List 13: 21361 - 21367." type="journal article" year="2017">
Medina
<emphasis box="[809,870,1286,1308]" italics="true" pageId="12" pageNumber="1025">et al.</emphasis>
, 2017
</bibRefCitation>
: table 1), although we suspect that the values reported by
<bibRefCitation author="Passamani M &amp; Serpa Cerboncini RA &amp; de Oliveira JE" box="[1034,1356,1317,1339]" pageId="12" pageNumber="1025" pagination="827 - 831" refId="ref17718" refString="Passamani M, Serpa Cerboncini RA, de Oliveira JE. 2011. Distribution extension of Phaenomys ferrugineus (Thomas, 1894), and new data on Abrawayaomys ruschii Cunha and Cruz, 1979 and Rhagomys rufescens (Thomas, 1886), three rare species of rodents (Rodentia: Cricetidae) in Minas Gerais, Brazil. Check List 7: 827 - 831." type="journal article" year="2011">
Passamani
<emphasis box="[1168,1226,1317,1338]" italics="true" pageId="12" pageNumber="1025">et al.</emphasis>
(2011: 829
</bibRefCitation>
; head and body length =
<quantity box="[1028,1110,1347,1369]" metricMagnitude="-2" metricUnit="m" metricValue="6.5" pageId="12" pageNumber="1025" unit="mm" value="65.0">65 mm</quantity>
, tail length =
<quantity box="[1275,1371,1347,1369]" metricMagnitude="-1" metricUnit="m" metricValue="1.05" pageId="12" pageNumber="1025" unit="mm" value="105.0">105 mm</quantity>
) are incorrect, based on our examination of the published image (
<bibRefCitation author="Passamani M &amp; Serpa Cerboncini RA &amp; de Oliveira JE" box="[897,1163,1409,1431]" pageId="12" pageNumber="1025" pagination="827 - 831" refId="ref17718" refString="Passamani M, Serpa Cerboncini RA, de Oliveira JE. 2011. Distribution extension of Phaenomys ferrugineus (Thomas, 1894), and new data on Abrawayaomys ruschii Cunha and Cruz, 1979 and Rhagomys rufescens (Thomas, 1886), three rare species of rodents (Rodentia: Cricetidae) in Minas Gerais, Brazil. Check List 7: 827 - 831." type="journal article" year="2011">
Passamani
<emphasis box="[1033,1092,1409,1430]" italics="true" pageId="12" pageNumber="1025">et al.</emphasis>
, 2011
</bibRefCitation>
: fig. 6; ratio head and body length to tail length ~0.8). Photographs of live
<taxonomicName authorityName="Thomas" authorityYear="1917" box="[809,927,1470,1491]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="12" pageNumber="1025" phylum="Chordata" rank="genus">
<emphasis box="[809,927,1470,1491]" italics="true" pageId="12" pageNumber="1025">Rhagomys</emphasis>
</taxonomicName>
(e.g.
<bibRefCitation author="Luna L &amp; Patterson BD" box="[986,1258,1470,1491]" pageId="12" pageNumber="1025" pagination="1 - 24" refId="ref16780" refString="Luna L, Patterson BD. 2003. A remarkable new mouse (Muridae: Sigmodontinae) from southeastern Peru: with comments on the affinities of Rhagomys rufescens (Thomas, 1886). Fieldiana Zoology 101: 1 - 24." type="journal article" year="2003">Luna &amp; Patterson, 2003</bibRefCitation>
: fig. 2;
<bibRefCitation author="Medina CE &amp; Diaz DR &amp; Pino K &amp; Pari A &amp; Zeballos H" pageId="12" pageNumber="1025" pagination="21361 - 21367" refId="ref16915" refString="Medina CE, Diaz DR, Pino K, Pari A, Zeballos H. 2017. New locality records of Rhagomys longilingua Luna &amp; Patterson, 2003 (Rodentia: Cricetidae) in Peru. Check List 13: 21361 - 21367." type="journal article" year="2017">
Medina
<emphasis box="[809,867,1501,1522]" italics="true" pageId="12" pageNumber="1025">et al.</emphasis>
, 2017
</bibRefCitation>
: fig. 1; Supporting Information, Appendix S3) allow the size of the eyeballs to be judged as conspicuous. No direct data of the eyeball axial length are available for
<taxonomicName authorityName="Thomas" authorityYear="1917" box="[1004,1123,1593,1614]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="12" pageNumber="1025" phylum="Chordata" rank="genus">
<emphasis box="[1004,1123,1593,1614]" italics="true" pageId="12" pageNumber="1025">Rhagomys</emphasis>
</taxonomicName>
, hampering any confident quantitative approach. However, based on the detailed picture provided by
<bibRefCitation author="Medina CE &amp; Diaz DR &amp; Pino K &amp; Pari A &amp; Zeballos H" box="[1055,1290,1654,1676]" pageId="12" pageNumber="1025" pagination="21361 - 21367" refId="ref16915" refString="Medina CE, Diaz DR, Pino K, Pari A, Zeballos H. 2017. New locality records of Rhagomys longilingua Luna &amp; Patterson, 2003 (Rodentia: Cricetidae) in Peru. Check List 13: 21361 - 21367." type="journal article" year="2017">
Medina
<emphasis box="[1154,1215,1654,1676]" italics="true" pageId="12" pageNumber="1025">et al.</emphasis>
(2017
</bibRefCitation>
: fig. 1), we estimated an eyeball axial length of
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for the illustrated adult specimen of
<taxonomicName baseAuthorityName="Luna &amp; Patterson" baseAuthorityYear="2003" box="[1176,1351,1715,1737]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="12" pageNumber="1025" phylum="Chordata" rank="species" species="longilingua">
<emphasis box="[1176,1351,1715,1737]" italics="true" pageId="12" pageNumber="1025">R. longilingua</emphasis>
</taxonomicName>
(with a body mass of
<quantity box="[1002,1055,1746,1767]" metricMagnitude="-2" metricUnit="kg" metricValue="2.4" pageId="12" pageNumber="1025" unit="g" value="24.0">24 g</quantity>
;
<bibRefCitation author="Medina CE &amp; Diaz DR &amp; Pino K &amp; Pari A &amp; Zeballos H" box="[1070,1308,1746,1768]" pageId="12" pageNumber="1025" pagination="21361 - 21367" refId="ref16915" refString="Medina CE, Diaz DR, Pino K, Pari A, Zeballos H. 2017. New locality records of Rhagomys longilingua Luna &amp; Patterson, 2003 (Rodentia: Cricetidae) in Peru. Check List 13: 21361 - 21367." type="journal article" year="2017">
Medina
<emphasis box="[1171,1233,1746,1768]" italics="true" pageId="12" pageNumber="1025">et al.</emphasis>
, 2017
</bibRefCitation>
: table 1). According to the equation of
<bibRefCitation author="Howland HC &amp; Merola S &amp; Basarab JR" box="[1133,1375,1776,1798]" pageId="12" pageNumber="1025" pagination="2043 - 2065" refId="ref16438" refString="Howland HC, Merola S, Basarab JR. 2004. The allometry and scaling of the size of vertebrate eyes. Vision Research 44: 2043 - 2065." type="journal article" year="2004">
Howland
<emphasis box="[1242,1298,1776,1798]" italics="true" pageId="12" pageNumber="1025">et al.</emphasis>
(2004)
</bibRefCitation>
, the expected eyeball axial length for a mammal of
<quantity box="[1349,1397,1807,1829]" metricMagnitude="-2" metricUnit="kg" metricValue="2.4" pageId="12" pageNumber="1025" unit="g" value="24.0">24 g</quantity>
is
<quantity box="[809,908,1838,1859]" metricMagnitude="-3" metricUnit="m" metricValue="3.72" pageId="12" pageNumber="1025" unit="mm" value="3.72">3.72 mm</quantity>
; employing the equation restricted for rodents (
<bibRefCitation author="Panyutina AA &amp; Kuznetsov AN &amp; Volodin IA &amp; Abramov AV &amp; Soldatova IB" box="[817,1110,1868,1890]" pageId="12" pageNumber="1025" pagination="172 - 184" refId="ref17353" refString="Panyutina AA, Kuznetsov AN, Volodin IA, Abramov AV, Soldatova IB. 2017. A blind climber: the first evidence of ultrasonic echolocation in arboreal mammals. Integrative Zoology 12: 172 - 184." type="journal article" year="2017">
Panyutina
<emphasis box="[940,993,1868,1890]" italics="true" pageId="12" pageNumber="1025">et al.</emphasis>
, 2017: 174
</bibRefCitation>
), this value is
<quantity box="[1264,1362,1868,1890]" metricMagnitude="-3" metricUnit="m" metricValue="3.75" pageId="12" pageNumber="1025" unit="mm" value="3.75">3.75 mm</quantity>
. Both are well below our crude value of
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, suggesting that the subjective perception that
<taxonomicName authorityName="Thomas" authorityYear="1917" box="[585,707,1396,1417]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="13" pageNumber="1026" phylum="Chordata" rank="genus">
<emphasis box="[585,707,1396,1417]" italics="true" pageId="13" pageNumber="1026">Rhagomys</emphasis>
</taxonomicName>
has a large eye can be supported quantitatively. To connect this eye size with an improved nocturnal vision seems plausible, but also the possibility of an enhanced ability to visually detect small food items, such as insects, invites further experimental research. The rhinarium in
<taxonomicName authorityName="Thomas" authorityYear="1917" box="[197,323,1580,1601]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="13" pageNumber="1026" phylum="Chordata" rank="genus">
<emphasis box="[197,323,1580,1601]" italics="true" pageId="13" pageNumber="1026">Rhagomys</emphasis>
</taxonomicName>
remains undescribed. Based on
<specimenCount pageId="13" pageNumber="1026" type="generic">two specimens</specimenCount>
of
<taxonomicName baseAuthorityName="Thomas" baseAuthorityYear="1886" box="[309,441,1610,1632]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="13" pageNumber="1026" phylum="Chordata" rank="species" species="rufescens">
<emphasis box="[309,441,1610,1632]" italics="true" pageId="13" pageNumber="1026">R. rufescens</emphasis>
</taxonomicName>
and one of
<taxonomicName box="[561,758,1610,1632]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="13" pageNumber="1026" phylum="Chordata" rank="species" species="septentrionalis">
<emphasis box="[561,758,1610,1632]" italics="true" pageId="13" pageNumber="1026">R. septentrionalis</emphasis>
</taxonomicName>
it seems similar in western and eastern species (
<figureCitation box="[685,764,1641,1663]" captionStart="Figure 9" captionStartId="13.[163,242,1158,1180]" captionTargetBox="[280,1330,204,1115]" captionTargetId="figure-328@13.[264,1342,195,1118]" captionTargetPageId="13" captionText="Figure 9. Selected soft anatomical traits of Rhagomys: A, dorsal view of the tongue in R. septentrionalis (MEPN 12715); B, caecal portion of the intestine in R. rufescens (MZUFV-CM 3706); C, soft palate in R. septentrionalis (MECN 6172); D, external (left) and internal (right) view of the stomach in R. rufescens (MZUFV-CM 3706); E, frontal view of the rhinarium in R. rufescens (right panel; MZUSP 33890) and R. septentrionalis (left panel; MECN 6172). Abbreviations: a, alanasi; ce, caecum; co, colon; cv, circumvallate papilla; d, diastemal ridge; es, esophagus; i, interdental ridge; il, ileum; n, nasal pad; p, basal fold; ph, philtrum; py, pylorous." figureDoi="http://doi.org/10.5281/zenodo.7323812" httpUri="https://zenodo.org/record/7323812/files/figure.png" pageId="13" pageNumber="1026">Fig. 9E</figureCitation>
): furred suprarhinarial region, moderate in size and embellished with two finely sculptured and rounded narial pads (or tubercles;
<bibRefCitation author="Hill WOC" box="[459,571,1733,1755]" pageId="13" pageNumber="1026" pagination="276 - 277" refId="ref16418" refString="Hill WOC. 1948. An undescribed structure in the rodent rhinarium. Nature 161: 276 - 277." type="journal article" year="1948">Hill, 1948</bibRefCitation>
) positioned below the nostril line. While the dorsal integumental fold appears scarcely developed, the ventral integumental fold has a dominant role in the lateral expression of the rhinarium. Nasal openings, internally flanked by folds (parts of dorsal integumental fold?), are dorsally divided by tegumental promontories that produce rounded internal atrioturbinates. The entire rhinarium is medially dissected by the sulcus medianus, a continuation of the philtrum, which divides well-haired, upper lips (
<figureCitation box="[967,1054,1488,1510]" captionStart="Figure 9" captionStartId="13.[163,242,1158,1180]" captionTargetBox="[280,1330,204,1115]" captionTargetId="figure-328@13.[264,1342,195,1118]" captionTargetPageId="13" captionText="Figure 9. Selected soft anatomical traits of Rhagomys: A, dorsal view of the tongue in R. septentrionalis (MEPN 12715); B, caecal portion of the intestine in R. rufescens (MZUFV-CM 3706); C, soft palate in R. septentrionalis (MECN 6172); D, external (left) and internal (right) view of the stomach in R. rufescens (MZUFV-CM 3706); E, frontal view of the rhinarium in R. rufescens (right panel; MZUSP 33890) and R. septentrionalis (left panel; MECN 6172). Abbreviations: a, alanasi; ce, caecum; co, colon; cv, circumvallate papilla; d, diastemal ridge; es, esophagus; i, interdental ridge; il, ileum; n, nasal pad; p, basal fold; ph, philtrum; py, pylorous." figureDoi="http://doi.org/10.5281/zenodo.7323812" httpUri="https://zenodo.org/record/7323812/files/figure.png" pageId="13" pageNumber="1026">Fig. 9E</figureCitation>
). Almost nothing was described about the ears in
<taxonomicName authorityName="Thomas" authorityYear="1917" box="[1034,1154,1518,1539]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="13" pageNumber="1026" phylum="Chordata" rank="genus">
<emphasis box="[1034,1154,1518,1539]" italics="true" pageId="13" pageNumber="1026">Rhagomys</emphasis>
</taxonomicName>
beyond pilosity and size (e.g.
<bibRefCitation author="Luna L &amp; Patterson BD" box="[878,1173,1549,1571]" pageId="13" pageNumber="1026" pagination="1 - 24" refId="ref16780" refString="Luna L, Patterson BD. 2003. A remarkable new mouse (Muridae: Sigmodontinae) from southeastern Peru: with comments on the affinities of Rhagomys rufescens (Thomas, 1886). Fieldiana Zoology 101: 1 - 24." type="journal article" year="2003">Luna &amp; Patterson, 2003: 5</bibRefCitation>
;
<bibRefCitation author="Percequillo AR &amp; Goncalves PR &amp; de Oliveira JA" pageId="13" pageNumber="1026" pagination="238 - 257" refId="ref17903" refString="Percequillo AR, Goncalves PR, de Oliveira JA. 2004. The rediscovery of Rhagomys rufescens (Thomas, 1886), with a morphological redescription and comments on its systematic relationships based on morphological and molecular (cytochrome b) characters. Mammalian Biology 69: 238 - 257." type="journal article" year="2004">
Percequillo
<emphasis box="[1316,1370,1549,1571]" italics="true" pageId="13" pageNumber="1026">et al.</emphasis>
, 2004: 242
</bibRefCitation>
). The specimen MECN 6172 (
<taxonomicName box="[1226,1433,1580,1601]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="13" pageNumber="1026" phylum="Chordata" rank="species" species="septentrionalis">
<emphasis box="[1226,1433,1580,1601]" italics="true" pageId="13" pageNumber="1026">R. septentrionalis</emphasis>
</taxonomicName>
) has a rounded auricular pinna, which is concealed basally by head fur and the internal surface of which is covered with delicate hairs. The striking feature of this apparently simple ear is the deep, well recessed concha (Supporting Information, Appendix S12). To our best understanding, this condition could be linked to the internal flexure of the basicranial region and its effect on the several related structures.
</paragraph>
<caption ID-DOI="http://doi.org/10.5281/zenodo.7323812" ID-Zenodo-Dep="7323812" httpUri="https://zenodo.org/record/7323812/files/figure.png" pageId="13" pageNumber="1026" startId="13.[163,242,1158,1180]" targetBox="[280,1330,204,1115]" targetPageId="13">
<paragraph blockId="13.[163,1443,1158,1327]" pageId="13" pageNumber="1026">
<emphasis bold="true" box="[163,268,1158,1180]" pageId="13" pageNumber="1026">Figure 9.</emphasis>
Selected soft anatomical traits of
<taxonomicName authorityName="Thomas" authorityYear="1917" box="[636,746,1158,1180]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="13" pageNumber="1026" phylum="Chordata" rank="genus">
<emphasis box="[636,746,1158,1180]" italics="true" pageId="13" pageNumber="1026">Rhagomys</emphasis>
</taxonomicName>
: A, dorsal view of the tongue in
<taxonomicName box="[1088,1273,1158,1180]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="13" pageNumber="1026" phylum="Chordata" rank="species" species="septentrionalis">
<emphasis box="[1088,1273,1158,1180]" italics="true" pageId="13" pageNumber="1026">R. septentrionalis</emphasis>
</taxonomicName>
(MEPN 12715); B, caecal portion of the intestine in
<taxonomicName baseAuthorityName="Thomas" baseAuthorityYear="1886" box="[543,670,1187,1209]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="13" pageNumber="1026" phylum="Chordata" rank="species" species="rufescens">
<emphasis box="[543,670,1187,1209]" italics="true" pageId="13" pageNumber="1026">R. rufescens</emphasis>
</taxonomicName>
(MZUFV-CM 3706); C, soft palate in
<taxonomicName box="[1068,1254,1187,1209]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="13" pageNumber="1026" phylum="Chordata" rank="species" species="septentrionalis">
<emphasis box="[1068,1254,1187,1209]" italics="true" pageId="13" pageNumber="1026">R. septentrionalis</emphasis>
</taxonomicName>
(MECN 6172); D, external (left) and internal (right) view of the stomach in
<taxonomicName baseAuthorityName="Thomas" baseAuthorityYear="1886" box="[765,889,1217,1239]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="13" pageNumber="1026" phylum="Chordata" rank="species" species="rufescens">
<emphasis box="[765,889,1217,1239]" italics="true" pageId="13" pageNumber="1026">R. rufescens</emphasis>
</taxonomicName>
(MZUFV-CM 3706); E, frontal view of the rhinarium in
<taxonomicName baseAuthorityName="Thomas" baseAuthorityYear="1886" box="[191,317,1246,1268]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="13" pageNumber="1026" phylum="Chordata" rank="species" species="rufescens">
<emphasis box="[191,317,1246,1268]" italics="true" pageId="13" pageNumber="1026">R. rufescens</emphasis>
</taxonomicName>
(right panel; MZUSP 33890) and
<taxonomicName box="[677,863,1246,1268]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="13" pageNumber="1026" phylum="Chordata" rank="species" species="septentrionalis">
<emphasis box="[677,863,1246,1268]" italics="true" pageId="13" pageNumber="1026">R. septentrionalis</emphasis>
</taxonomicName>
(left panel; MECN 6172). Abbreviations: a, alanasi; ce, caecum; co, colon; cv, circumvallate papilla; d, diastemal ridge; es, esophagus; i, interdental ridge; il, ileum; n, nasal pad; p, basal fold; ph, philtrum; py, pylorous.
</paragraph>
</caption>
<paragraph blockId="13.[827,1444,1365,1908]" lastBlockId="14.[809,1426,197,1905]" lastPageId="14" lastPageNumber="1027" pageId="13" pageNumber="1026">
Minor cranial details worthy of comment are the reported absence of an alisphenoid strut and the narrow condition indicated for the zygomatic plate of
<taxonomicName authority="(Abreu-Junior &amp; Percequillo, 2019)" baseAuthorityName="Abreu-Junior &amp; Percequillo" baseAuthorityYear="2019" box="[145,714,1178,1200]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="species" species="rufescens">
<emphasis box="[145,286,1178,1200]" italics="true" pageId="14" pageNumber="1027">R. rufescens</emphasis>
(
<bibRefCitation author="de Abreu-Junior EF &amp; Percequillo AR" box="[304,703,1178,1200]" pageId="14" pageNumber="1027" pagination="1 - 116" refId="ref14713" refString="de Abreu-Junior EF, Percequillo AR. 2019. Small mammals of the Estacao Ecologica de Bananal, southeastern Atlantic Forest, Brazil, with description of a new species of Brucepattersonius (Rodentia, Sigmodontinae). Arquivos de Zoologia 50: 1 - 116." type="journal article" year="2019">Abreu-Júnior &amp; Percequillo, 2019</bibRefCitation>
)
</taxonomicName>
. All specimens of this species studied here have a thick alisphenoid strut on both sides of the cranium (
<figureCitation box="[656,746,1239,1261]" captionStart="Figure 11" captionStartId="15.[162,240,1174,1196]" captionTargetBox="[323,1281,197,1133]" captionTargetId="figure-264@15.[322,1282,196,1134]" captionTargetPageId="15" captionText="Figure 11. Selected cranial details in Rhagomys rufescens (all based on MZUFV-CM 3706): A, laterodorsal view of the left temporal region showing the alisphenoid strut (as); B, lateral view of the anterior part of the cranium to show the broad zygomatic plate (note also the staggered incisor profile highlighted by an arrow); C, left zygomatic plate ventrally viewed to put in evidence the thick posterior border (pb) transversally oriented and the point (marked with an arrow) where the shaft twist; D, lateroventral view of the occipital region showing a large foramen magnum (fm), the left mastoid capsule (mc) and the ventral appearance of a prominent petrosal (pe)." figureDoi="http://doi.org/10.5281/zenodo.7323816" httpUri="https://zenodo.org/record/7323816/files/figure.png" pageId="14" pageNumber="1027">Fig.11A</figureCitation>
), and the same has been reported previously (e.g.
<bibRefCitation author="Percequillo AR &amp; Goncalves PR &amp; de Oliveira JA" box="[145,469,1301,1323]" pageId="14" pageNumber="1027" pagination="238 - 257" refId="ref17903" refString="Percequillo AR, Goncalves PR, de Oliveira JA. 2004. The rediscovery of Rhagomys rufescens (Thomas, 1886), with a morphological redescription and comments on its systematic relationships based on morphological and molecular (cytochrome b) characters. Mammalian Biology 69: 238 - 257." type="journal article" year="2004">
Percequillo
<emphasis box="[283,341,1301,1323]" italics="true" pageId="14" pageNumber="1027">et al.</emphasis>
, 2004: 244
</bibRefCitation>
;
<bibRefCitation author="Pinheiro PS &amp; Hartmann PA &amp; Geise L" box="[481,746,1301,1323]" pageId="14" pageNumber="1027" pagination="1 - 11" refId="ref18162" refString="Pinheiro PS, Hartmann PA, Geise L. 2004. New record of Rhagomys rufescens (Thomas 1886) (Rodentia: Muridae: Sigmodontinae) in the Atlantic forest of southeastern Brazil. Zootaxa 431: 1 - 11." type="journal article" year="2004">
Pinheiro
<emphasis box="[590,648,1301,1323]" italics="true" pageId="14" pageNumber="1027">et al.</emphasis>
, 2004: 5
</bibRefCitation>
); we suspect that the absence highlighted by AbreuJúnior &amp; Percequillo (2019: 77) is an error. In addition, the zygomatic plate in
<taxonomicName authorityName="Thomas" authorityYear="1917" box="[401,519,1393,1414]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="genus">
<emphasis box="[401,519,1393,1414]" italics="true" pageId="14" pageNumber="1027">Rhagomys</emphasis>
</taxonomicName>
can hardly be judged as narrow; on the contrary, it is a broad structure (
<figureCitation box="[153,252,1454,1476]" captionStart="Figure 11" captionStartId="15.[162,240,1174,1196]" captionTargetBox="[323,1281,197,1133]" captionTargetId="figure-264@15.[322,1282,196,1134]" captionTargetPageId="15" captionText="Figure 11. Selected cranial details in Rhagomys rufescens (all based on MZUFV-CM 3706): A, laterodorsal view of the left temporal region showing the alisphenoid strut (as); B, lateral view of the anterior part of the cranium to show the broad zygomatic plate (note also the staggered incisor profile highlighted by an arrow); C, left zygomatic plate ventrally viewed to put in evidence the thick posterior border (pb) transversally oriented and the point (marked with an arrow) where the shaft twist; D, lateroventral view of the occipital region showing a large foramen magnum (fm), the left mastoid capsule (mc) and the ventral appearance of a prominent petrosal (pe)." figureDoi="http://doi.org/10.5281/zenodo.7323816" httpUri="https://zenodo.org/record/7323816/files/figure.png" pageId="14" pageNumber="1027">Fig. 11B</figureCitation>
). However, when examined superficially, it seems narrow because the external shaft is arcuate, giving its posterior border a transverse orientation; in addition, the upper free border shows a marked twist, and the plate is basally broadened (
<figureCitation box="[647,746,1577,1599]" captionStart="Figure 11" captionStartId="15.[162,240,1174,1196]" captionTargetBox="[323,1281,197,1133]" captionTargetId="figure-264@15.[322,1282,196,1134]" captionTargetPageId="15" captionText="Figure 11. Selected cranial details in Rhagomys rufescens (all based on MZUFV-CM 3706): A, laterodorsal view of the left temporal region showing the alisphenoid strut (as); B, lateral view of the anterior part of the cranium to show the broad zygomatic plate (note also the staggered incisor profile highlighted by an arrow); C, left zygomatic plate ventrally viewed to put in evidence the thick posterior border (pb) transversally oriented and the point (marked with an arrow) where the shaft twist; D, lateroventral view of the occipital region showing a large foramen magnum (fm), the left mastoid capsule (mc) and the ventral appearance of a prominent petrosal (pe)." figureDoi="http://doi.org/10.5281/zenodo.7323816" httpUri="https://zenodo.org/record/7323816/files/figure.png" pageId="14" pageNumber="1027">Fig. 11C</figureCitation>
). As mirrored by several bony structures of the cranium of
<taxonomicName authorityName="Thomas" authorityYear="1917" box="[173,292,1638,1659]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="genus">
<emphasis box="[173,292,1638,1659]" italics="true" pageId="14" pageNumber="1027">Rhagomys</emphasis>
</taxonomicName>
, well-developed musculature is probably implied behind this configuration. Even working with damaged material,
<bibRefCitation author="Thomas O" box="[379,616,1699,1721]" pageId="14" pageNumber="1027" pagination="250 - 251" refId="ref19091" refString="Thomas O. 1886. Description of a new Brazilian species of Hesperomys. Annals and Magazine of Natural History; Zoology, Botany, and Geology 17: 250 - 251." type="journal article" year="1886">Thomas (1886: 250)</bibRefCitation>
was able to observe a skull with the cranial portion very large characterizing
<taxonomicName authorityName="Thomas" authorityYear="1917" box="[315,433,1761,1782]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="genus">
<emphasis box="[315,433,1761,1782]" italics="true" pageId="14" pageNumber="1027">Rhagomys</emphasis>
</taxonomicName>
(see also:
<bibRefCitation author="Luna L &amp; Patterson BD" pageId="14" pageNumber="1027" pagination="1 - 24" refId="ref16780" refString="Luna L, Patterson BD. 2003. A remarkable new mouse (Muridae: Sigmodontinae) from southeastern Peru: with comments on the affinities of Rhagomys rufescens (Thomas, 1886). Fieldiana Zoology 101: 1 - 24." type="journal article" year="2003">Luna &amp; Patterson, 2003</bibRefCitation>
;
<bibRefCitation author="Percequillo AR &amp; Goncalves PR &amp; de Oliveira JA" box="[215,483,1791,1813]" pageId="14" pageNumber="1027" pagination="238 - 257" refId="ref17903" refString="Percequillo AR, Goncalves PR, de Oliveira JA. 2004. The rediscovery of Rhagomys rufescens (Thomas, 1886), with a morphological redescription and comments on its systematic relationships based on morphological and molecular (cytochrome b) characters. Mammalian Biology 69: 238 - 257." type="journal article" year="2004">
Percequillo
<emphasis box="[354,413,1791,1813]" italics="true" pageId="14" pageNumber="1027">et al.</emphasis>
, 2004
</bibRefCitation>
). The dominance of the braincase is accompanied by a large foramen magnum oriented posteroventrally (
<figureCitation box="[442,535,1853,1875]" captionStart="Figure 11" captionStartId="15.[162,240,1174,1196]" captionTargetBox="[323,1281,197,1133]" captionTargetId="figure-264@15.[322,1282,196,1134]" captionTargetPageId="15" captionText="Figure 11. Selected cranial details in Rhagomys rufescens (all based on MZUFV-CM 3706): A, laterodorsal view of the left temporal region showing the alisphenoid strut (as); B, lateral view of the anterior part of the cranium to show the broad zygomatic plate (note also the staggered incisor profile highlighted by an arrow); C, left zygomatic plate ventrally viewed to put in evidence the thick posterior border (pb) transversally oriented and the point (marked with an arrow) where the shaft twist; D, lateroventral view of the occipital region showing a large foramen magnum (fm), the left mastoid capsule (mc) and the ventral appearance of a prominent petrosal (pe)." figureDoi="http://doi.org/10.5281/zenodo.7323816" httpUri="https://zenodo.org/record/7323816/files/figure.png" pageId="14" pageNumber="1027">Fig. 11D</figureCitation>
). The latter is better appreciated when viewed from inside, including also the caudal downward orientation of the basioccipital, the middle lacerate foramina present as slits [but not absent, as was stated by
<bibRefCitation author="Percequillo AR &amp; Goncalves PR &amp; de Oliveira JA" pageId="14" pageNumber="1027" pagination="238 - 257" refId="ref17903" refString="Percequillo AR, Goncalves PR, de Oliveira JA. 2004. The rediscovery of Rhagomys rufescens (Thomas, 1886), with a morphological redescription and comments on its systematic relationships based on morphological and molecular (cytochrome b) characters. Mammalian Biology 69: 238 - 257." type="journal article" year="2004">
Percequillo
<emphasis box="[1288,1346,258,280]" italics="true" pageId="14" pageNumber="1027">et al.</emphasis>
(2004: 245)
</bibRefCitation>
] and a long presphenoid (
<figureCitation box="[1161,1245,289,311]" captionStart="Figure 3" captionStartId="6.[145,226,1163,1185]" captionTargetBox="[146,1416,196,1123]" captionTargetId="figure-256@6.[145,1425,195,1123]" captionTargetPageId="6" captionText="Figure 3. Selected anatomical traits and regions in the cranium of Rhagomys: A, lateral left view of the cranium of R. septentrionalis (MEPN 10898): note the position of the mastoid (mc) well above the basal plane (indicated by the yellow horizontal line); B, lateral view of the left otic region of R. rufescens (MZUFV-CM 3706); C, ventral view of basicranial region of R. septentrionalis (MECN 6172); D, dorsal view (roofing bones of braincase removed) of basicranial region of R. septentrionalis (MEPN 10898); E, cross-section of the cranium of R. septentrionalis (MEPN 10898) at the frontal sinuses plane. Abbreviations: bs, basisphenoid; bo, basioccipital; f, fontanelle; fo, foramen ovale; m, foramen magnum; etI, ethmoturbinal I; etII, ethmoturbinal II; etIII, ethmoturbinal III; ft1, frontoturbinal 1; ft2, frontoturbinal 2; it, interturbinal; ls, lamina semicircularis; ps, presphenoid. Except for B the pictures are three-dimensional reconstructions based on micro-CT data." figureDoi="http://doi.org/10.5281/zenodo.7323796" httpUri="https://zenodo.org/record/7323796/files/figure.png" pageId="14" pageNumber="1027">Fig. 3D</figureCitation>
). Turbinals are comparatively complex (
<figureCitation box="[1103,1188,320,342]" captionStart="Figure 3" captionStartId="6.[145,226,1163,1185]" captionTargetBox="[146,1416,196,1123]" captionTargetId="figure-256@6.[145,1425,195,1123]" captionTargetPageId="6" captionText="Figure 3. Selected anatomical traits and regions in the cranium of Rhagomys: A, lateral left view of the cranium of R. septentrionalis (MEPN 10898): note the position of the mastoid (mc) well above the basal plane (indicated by the yellow horizontal line); B, lateral view of the left otic region of R. rufescens (MZUFV-CM 3706); C, ventral view of basicranial region of R. septentrionalis (MECN 6172); D, dorsal view (roofing bones of braincase removed) of basicranial region of R. septentrionalis (MEPN 10898); E, cross-section of the cranium of R. septentrionalis (MEPN 10898) at the frontal sinuses plane. Abbreviations: bs, basisphenoid; bo, basioccipital; f, fontanelle; fo, foramen ovale; m, foramen magnum; etI, ethmoturbinal I; etII, ethmoturbinal II; etIII, ethmoturbinal III; ft1, frontoturbinal 1; ft2, frontoturbinal 2; it, interturbinal; ls, lamina semicircularis; ps, presphenoid. Except for B the pictures are three-dimensional reconstructions based on micro-CT data." figureDoi="http://doi.org/10.5281/zenodo.7323796" httpUri="https://zenodo.org/record/7323796/files/figure.png" pageId="14" pageNumber="1027">Fig. 3E</figureCitation>
; cf.
<bibRefCitation author="Martinez Q &amp; Lebrun R &amp; Achmadi AS &amp; Esselstyn JA &amp; Evans AR &amp; Heaney LR &amp; Portela Miguez R &amp; Rowe KC &amp; Fabre PH" pageId="14" pageNumber="1027" pagination="17806" refId="ref16844" refString="Martinez Q, Lebrun R, Achmadi AS, Esselstyn JA, Evans AR, Heaney LR, Portela Miguez R, Rowe KC, Fabre PH. 2018. Convergent evolution of an extreme dietary specialisation, the olfactory system of worm-eating rodents. Scientific Reports 8: 17806." type="journal article" year="2018">
Martinez
<emphasis box="[1358,1418,320,341]" italics="true" pageId="14" pageNumber="1027">et al.</emphasis>
, 2018
</bibRefCitation>
). Interesting to note, although the tegmen tympani abuts, to some degree, a small suspensory process of the squamosal in adults, this condition is not evident in juveniles (Supporting Information, Appendix S13). Special features of the dentary in
<taxonomicName authorityName="Thomas" authorityYear="1917" box="[1211,1332,473,494]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="genus">
<emphasis box="[1211,1332,473,494]" italics="true" pageId="14" pageNumber="1027">Rhagomys</emphasis>
</taxonomicName>
include a large mandibular foramen ventrally flanked by an unusually bulging and, in cross-section, rounded crista mandibulae (Supporting Information, Appendix S14). While the former indicates a thick mandibular (trigeminal) nerve, the latter reflects the enlarged development of the incisor.
</paragraph>
<paragraph blockId="14.[809,1426,197,1905]" pageId="14" pageNumber="1027">
<bibRefCitation author="Thomas O" box="[833,1066,688,710]" pageId="14" pageNumber="1027" pagination="192 - 198" refId="ref19299" refString="Thomas O. 1917. On the arrangement of the South American rats allied to Oryzomys and Rhipidomys. Annals and Magazine of Natural History; Zoology, Botany, and Geology 20: 192 - 198." type="journal article" year="1917">Thomas (1917: 193)</bibRefCitation>
emphasized the upper incisor features in
<taxonomicName authorityName="Thomas" authorityYear="1917" box="[954,1079,718,739]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="genus">
<emphasis box="[954,1079,718,739]" italics="true" pageId="14" pageNumber="1027">Rhagomys</emphasis>
</taxonomicName>
indicating ‘… front surface flattened and inclined inwards, so that the resulting relations of the two teeth and the shapes of their tips are about as in the Dormice [
<taxonomicName authorityName="Muirhead" authorityYear="1819" box="[1151,1253,810,832]" class="Mammalia" family="Gliridae" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="family">Gliridae</taxonomicName>
], not as in any of the genera above mentioned [
<taxonomicName authorityName="Thomas" authorityYear="1906" box="[1171,1270,841,862]" class="Mammalia" family="Cricetidae" genus="Oecomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="genus">
<emphasis box="[1171,1270,841,862]" italics="true" pageId="14" pageNumber="1027">Oecomys</emphasis>
</taxonomicName>
,
<taxonomicName authorityName="Tschudi" authorityYear="1845" box="[1282,1419,841,862]" class="Mammalia" family="Cricetidae" genus="Rhipidomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="genus">
<emphasis box="[1282,1419,841,862]" italics="true" pageId="14" pageNumber="1027">Rhipidomys</emphasis>
</taxonomicName>
, etc.]. Our inspection reinforces the occurrence of this peculiar kind of incisor frontal surface condition and orientation (
<figureCitation box="[1006,1090,933,955]" captionStart="Figure 5" captionStartId="9.[163,247,1249,1271]" captionTargetBox="[324,1283,196,1209]" captionTargetId="figure-256@9.[323,1283,195,1210]" captionTargetPageId="9" captionText="Figure 5. Incisor external appearance and morphology of Rhagomys: A, labial view of the left lower incisor of R. septentrionalis (MECN 6172): note the thick band of enamel (e) compared to dentine (d); B, ventral view of the left lower incisor of R. septentrionalis (MECN 6172): note the tenues groove (g); C, frontal view of both upper incisors of R. rufescens (MZUFV-CM 3706): note the inverted v shape of the cutting edge (broken line) and the flattened anterior faces medially inclined (arrows); DF, ventral view of the left lower incisor of R. rufescens (MZUFV-CM 3706): note the textured surface. A and B are three-dimensional reconstructions based on micro-CT data." figureDoi="http://doi.org/10.5281/zenodo.7323802" httpUri="https://zenodo.org/record/7323802/files/figure.png" pageId="14" pageNumber="1027">Fig. 5C</figureCitation>
), probably associated with a particular feeding strategy (see below). In addition, at least for
<taxonomicName baseAuthorityName="Abreu-Junior &amp; Percequillo" baseAuthorityYear="2019" box="[969,1124,994,1016]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="species" species="rufescens">
<emphasis box="[969,1124,994,1016]" italics="true" pageId="14" pageNumber="1027">R. rufescens</emphasis>
</taxonomicName>
, the dentine profile is staggered when the incisor is viewed labially (
<figureCitation captionStart="Figure 11" captionStartId="15.[162,240,1174,1196]" captionTargetBox="[323,1281,197,1133]" captionTargetId="figure-264@15.[322,1282,196,1134]" captionTargetPageId="15" captionText="Figure 11. Selected cranial details in Rhagomys rufescens (all based on MZUFV-CM 3706): A, laterodorsal view of the left temporal region showing the alisphenoid strut (as); B, lateral view of the anterior part of the cranium to show the broad zygomatic plate (note also the staggered incisor profile highlighted by an arrow); C, left zygomatic plate ventrally viewed to put in evidence the thick posterior border (pb) transversally oriented and the point (marked with an arrow) where the shaft twist; D, lateroventral view of the occipital region showing a large foramen magnum (fm), the left mastoid capsule (mc) and the ventral appearance of a prominent petrosal (pe)." figureDoi="http://doi.org/10.5281/zenodo.7323816" httpUri="https://zenodo.org/record/7323816/files/figure.png" pageId="14" pageNumber="1027">Fig. 11B</figureCitation>
). The number of molar roots remains unreported for
<taxonomicName authorityName="Thomas" authorityYear="1917" box="[850,972,1086,1107]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="genus">
<emphasis box="[850,972,1086,1107]" italics="true" pageId="14" pageNumber="1027">Rhagomys</emphasis>
</taxonomicName>
. According to the 3D-images, at least
<taxonomicName box="[809,1020,1117,1139]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="species" species="septentrionalis">
<emphasis box="[809,1020,1117,1139]" italics="true" pageId="14" pageNumber="1027">R. septentrionalis</emphasis>
</taxonomicName>
has the M1/m1 anchored by four roots, while the M2-M3 are each three-rooted; all lower molars are two-rooted, a widespread condition in sigmodontines (Supporting Information, Appendix S15).
<bibRefCitation author="Gyldenstolpe N" box="[875,1098,1239,1261]" pageId="14" pageNumber="1027" pagination="1 - 164" refId="ref16116" refString="Gyldenstolpe N. 1932. A manual of Neotropical sigmodont rodents. Kunglia Svenska Vetenskapsakademiens Handlingar, Stockholm (Series 3) 11: 1 - 164." type="journal article" year="1932">Gyldenstolpe (1932</bibRefCitation>
: pl. III, fig. 4a) illustrated a four-rooted M1 and a three-rooted M
<quantity box="[1233,1275,1270,1292]" metricMagnitude="-2" metricUnit="m" metricValue="7.62" pageId="14" pageNumber="1027" unit="in" value="3.0">3 in</quantity>
the
<typeStatus box="[1327,1424,1270,1292]" pageId="14" pageNumber="1027">holotype</typeStatus>
of
<taxonomicName baseAuthorityName="Abreu-Junior &amp; Percequillo" baseAuthorityYear="2019" box="[836,971,1301,1322]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="species" species="rufescens">
<emphasis box="[836,971,1301,1322]" italics="true" pageId="14" pageNumber="1027">R. rufescens</emphasis>
</taxonomicName>
.
</paragraph>
<caption ID-DOI="http://doi.org/10.5281/zenodo.7323814" ID-Zenodo-Dep="7323814" httpUri="https://zenodo.org/record/7323814/files/figure.png" pageId="14" pageNumber="1027" startId="14.[145,227,1058,1080]" targetBox="[148,756,197,1017]" targetPageId="14">
<paragraph blockId="14.[145,759,1058,1109]" pageId="14" pageNumber="1027">
<emphasis bold="true" box="[145,270,1058,1080]" pageId="14" pageNumber="1027">Figure 10.</emphasis>
<taxonomicName authority="Pardiñas &amp; Tinoco &amp; Barbière &amp; Ronez &amp; Cañón &amp; Lessa &amp; Koch &amp; Brito, 2022" authorityName="Pardiñas &amp; Tinoco &amp; Barbière &amp; Ronez &amp; Cañón &amp; Lessa &amp; Koch &amp; Brito" authorityYear="2022" box="[282,418,1058,1080]" class="Mammalia" family="Cricetidae" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1024" phylum="Chordata" rank="tribe" status="TRIB. NOV." tribe="Rhagomyini">Rhagomyini</taxonomicName>
: current schematic geographic range in South America.
</paragraph>
</caption>
<paragraph blockId="14.[809,1426,197,1905]" pageId="14" pageNumber="1027">
Although mentioned by
<bibRefCitation author="Thomas O" box="[1106,1275,1331,1353]" pageId="14" pageNumber="1027" pagination="250 - 251" refId="ref19091" refString="Thomas O. 1886. Description of a new Brazilian species of Hesperomys. Annals and Magazine of Natural History; Zoology, Botany, and Geology 17: 250 - 251." type="journal article" year="1886">Thomas (1886)</bibRefCitation>
long ago, the soft palate of
<taxonomicName authorityName="Thomas" authorityYear="1917" box="[967,1087,1362,1383]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="genus">
<emphasis box="[967,1087,1362,1383]" italics="true" pageId="14" pageNumber="1027">Rhagomys</emphasis>
</taxonomicName>
has never been described. In our examination of
<taxonomicName box="[1024,1221,1393,1414]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="species" species="septentrionalis">
<emphasis box="[1024,1221,1393,1414]" italics="true" pageId="14" pageNumber="1027">R. septentrionalis</emphasis>
</taxonomicName>
, the configuration of diastemal and interdental ridges included three and four rugae, respectively. While the former are highly marked and broadened at their midpoints, the latter appear flattened, the first three well directed backwards and leaving an ample medial space (
<figureCitation box="[1332,1410,1546,1568]" captionStart="Figure 9" captionStartId="13.[163,242,1158,1180]" captionTargetBox="[280,1330,204,1115]" captionTargetId="figure-328@13.[264,1342,195,1118]" captionTargetPageId="13" captionText="Figure 9. Selected soft anatomical traits of Rhagomys: A, dorsal view of the tongue in R. septentrionalis (MEPN 12715); B, caecal portion of the intestine in R. rufescens (MZUFV-CM 3706); C, soft palate in R. septentrionalis (MECN 6172); D, external (left) and internal (right) view of the stomach in R. rufescens (MZUFV-CM 3706); E, frontal view of the rhinarium in R. rufescens (right panel; MZUSP 33890) and R. septentrionalis (left panel; MECN 6172). Abbreviations: a, alanasi; ce, caecum; co, colon; cv, circumvallate papilla; d, diastemal ridge; es, esophagus; i, interdental ridge; il, ileum; n, nasal pad; p, basal fold; ph, philtrum; py, pylorous." figureDoi="http://doi.org/10.5281/zenodo.7323812" httpUri="https://zenodo.org/record/7323812/files/figure.png" pageId="14" pageNumber="1027">Fig. 9C</figureCitation>
). The overall morphology of the soft interdental palate appears to facilitate rapid passage of food items more than any action associated with retention or chewing.
</paragraph>
<paragraph blockId="14.[809,1426,197,1905]" lastBlockId="15.[163,780,1387,1684]" lastPageId="15" lastPageNumber="1028" pageId="14" pageNumber="1027">
Gross morphology of the stomach is unilocularhemiglandular, first described and illustrated for
<taxonomicName baseAuthorityName="Luna &amp; Patterson" baseAuthorityYear="2003" box="[809,977,1730,1752]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="species" species="longilingua">
<emphasis box="[809,977,1730,1752]" italics="true" pageId="14" pageNumber="1027">R. longilingua</emphasis>
</taxonomicName>
(
<bibRefCitation author="Luna L &amp; Patterson BD" box="[994,1277,1730,1752]" pageId="14" pageNumber="1027" pagination="1 - 24" refId="ref16780" refString="Luna L, Patterson BD. 2003. A remarkable new mouse (Muridae: Sigmodontinae) from southeastern Peru: with comments on the affinities of Rhagomys rufescens (Thomas, 1886). Fieldiana Zoology 101: 1 - 24." type="journal article" year="2003">Luna &amp; Patterson, 2003</bibRefCitation>
: fig. 11) and subsequently mentioned for
<taxonomicName authority="(Pinheiro et al., 2004: 7)" baseAuthorityName="Pinheiro" baseAuthorityPageNumber="7" baseAuthorityYear="2004" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="species" species="rufescens">
<emphasis box="[1158,1303,1761,1782]" italics="true" pageId="14" pageNumber="1027">R. rufescens</emphasis>
(
<bibRefCitation author="Pinheiro PS &amp; Hartmann PA &amp; Geise L" pageId="14" pageNumber="1027" pagination="1 - 11" refId="ref18162" refString="Pinheiro PS, Hartmann PA, Geise L. 2004. New record of Rhagomys rufescens (Thomas 1886) (Rodentia: Muridae: Sigmodontinae) in the Atlantic forest of southeastern Brazil. Zootaxa 431: 1 - 11." type="journal article" year="2004">
Pinheiro
<emphasis box="[809,867,1791,1813]" italics="true" pageId="14" pageNumber="1027">et al.</emphasis>
, 2004: 7
</bibRefCitation>
)
</taxonomicName>
. Our examination of single specimens each of
<taxonomicName box="[896,1032,1822,1844]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="species" species="rufescens">
<emphasis box="[896,1032,1822,1844]" italics="true" pageId="14" pageNumber="1027">R. rufescens</emphasis>
</taxonomicName>
and of
<taxonomicName box="[1118,1318,1822,1844]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="14" pageNumber="1027" phylum="Chordata" rank="species" species="septentrionalis">
<emphasis box="[1118,1318,1822,1844]" italics="true" pageId="14" pageNumber="1027">R. septentrionalis</emphasis>
</taxonomicName>
confirms this generic pattern, which includes a heart-outlined organ with roughly subequal, cornified and glandular epithelia, a bordering fold not protruding to the left of the oesophageal opening (but directed posteriorly toward the greater curvature), a shallow
<emphasis box="[561,778,1448,1470]" italics="true" pageId="15" pageNumber="1028">incisura angularis</emphasis>
and a scarcely differentiated prepyloric part (
<figureCitation box="[689,772,1479,1501]" captionStart="Figure 9" captionStartId="13.[163,242,1158,1180]" captionTargetBox="[280,1330,204,1115]" captionTargetId="figure-328@13.[264,1342,195,1118]" captionTargetPageId="13" captionText="Figure 9. Selected soft anatomical traits of Rhagomys: A, dorsal view of the tongue in R. septentrionalis (MEPN 12715); B, caecal portion of the intestine in R. rufescens (MZUFV-CM 3706); C, soft palate in R. septentrionalis (MECN 6172); D, external (left) and internal (right) view of the stomach in R. rufescens (MZUFV-CM 3706); E, frontal view of the rhinarium in R. rufescens (right panel; MZUSP 33890) and R. septentrionalis (left panel; MECN 6172). Abbreviations: a, alanasi; ce, caecum; co, colon; cv, circumvallate papilla; d, diastemal ridge; es, esophagus; i, interdental ridge; il, ileum; n, nasal pad; p, basal fold; ph, philtrum; py, pylorous." figureDoi="http://doi.org/10.5281/zenodo.7323812" httpUri="https://zenodo.org/record/7323812/files/figure.png" pageId="15" pageNumber="1028">Fig. 9D</figureCitation>
; Supporting Information, Appendix S16). Finally, the gall bladder was reported as absent in
<taxonomicName authority="(Luna &amp; Patterson, 2003: 12)" baseAuthorityName="Luna &amp; Patterson" baseAuthorityPageNumber="12" baseAuthorityYear="2003" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="15" pageNumber="1028" phylum="Chordata" rank="species" species="longilingua">
<emphasis box="[546,705,1540,1562]" italics="true" pageId="15" pageNumber="1028">R. longilingua</emphasis>
(
<bibRefCitation author="Luna L &amp; Patterson BD" pageId="15" pageNumber="1028" pagination="1 - 24" refId="ref16780" refString="Luna L, Patterson BD. 2003. A remarkable new mouse (Muridae: Sigmodontinae) from southeastern Peru: with comments on the affinities of Rhagomys rufescens (Thomas, 1886). Fieldiana Zoology 101: 1 - 24." type="journal article" year="2003">Luna &amp; Patterson, 2003: 12</bibRefCitation>
)
</taxonomicName>
, and the same condition can be asserted for the other species of the genus based on the specimens we dissected (
<taxonomicName authority=", MZUFV-CM" authorityName="MZUFV-CM" box="[490,779,1632,1654]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="15" pageNumber="1028" phylum="Chordata" rank="species" species="rufescens">
<emphasis box="[490,626,1632,1654]" italics="true" pageId="15" pageNumber="1028">R. rufescens</emphasis>
, MZUFV-CM
</taxonomicName>
3706;
<taxonomicName authority=", MECN" authorityName="MECN" box="[229,513,1663,1684]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="15" pageNumber="1028" phylum="Chordata" rank="species" species="septentrionalis">
<emphasis box="[229,423,1663,1684]" italics="true" pageId="15" pageNumber="1028">R. septentrionalis</emphasis>
, MECN
</taxonomicName>
6172).
</paragraph>
<caption ID-DOI="http://doi.org/10.5281/zenodo.7323816" ID-Zenodo-Dep="7323816" httpUri="https://zenodo.org/record/7323816/files/figure.png" pageId="15" pageNumber="1028" startId="15.[162,240,1174,1196]" targetBox="[323,1281,197,1133]" targetPageId="15">
<paragraph blockId="15.[162,1443,1174,1342]" pageId="15" pageNumber="1028">
<emphasis bold="true" box="[162,279,1174,1196]" pageId="15" pageNumber="1028">Figure 11.</emphasis>
Selected cranial details in
<taxonomicName box="[568,779,1174,1196]" class="Mammalia" family="Cricetidae" genus="Rhagomys" kingdom="Animalia" order="Rodentia" pageId="15" pageNumber="1028" phylum="Chordata" rank="species" species="rufescens">
<emphasis box="[568,779,1174,1196]" italics="true" pageId="15" pageNumber="1028">Rhagomys rufescens</emphasis>
</taxonomicName>
(all based on MZUFV-CM 3706): A, laterodorsal view of the left temporal region showing the alisphenoid strut (as); B, lateral view of the anterior part of the cranium to show the broad zygomatic plate (note also the staggered incisor profile highlighted by an arrow); C, left zygomatic plate ventrally viewed to put in evidence the thick posterior border (pb) transversally oriented and the point (marked with an arrow) where the shaft twist; D, lateroventral view of the occipital region showing a large foramen magnum (fm), the left mastoid capsule (mc) and the ventral appearance of a prominent petrosal (pe).
</paragraph>
</caption>
<paragraph blockId="15.[163,456,1741,1765]" box="[163,456,1741,1765]" pageId="15" pageNumber="1028">
<heading box="[163,456,1741,1765]" centered="true" fontSize="9" level="2" pageId="15" pageNumber="1028" reason="2">
<emphasis box="[163,456,1741,1765]" italics="true" pageId="15" pageNumber="1028">Nomenclatural remarks</emphasis>
</heading>
</paragraph>
<paragraph blockId="15.[163,779,1781,1895]" lastBlockId="15.[827,1442,1389,1503]" pageId="15" pageNumber="1028">
The genus name is probably derived from Ancient Greek ῥαγόω = rhagóō, literally to crack (Supporting Information, Appendix S17) and µυς, mouse. Although not mentioned by
<bibRefCitation author="Thomas O" box="[373,546,1873,1895]" pageId="15" pageNumber="1028" pagination="192 - 198" refId="ref19299" refString="Thomas O. 1917. On the arrangement of the South American rats allied to Oryzomys and Rhipidomys. Annals and Magazine of Natural History; Zoology, Botany, and Geology 20: 192 - 198." type="journal article" year="1917">Thomas (1917)</bibRefCitation>
, this name possibly refers to the fact that the soles of the hind and forefeet are dissected by pronounced transverse grooves. The name of the tribe is derived from the addition of the tribal ending -ini, therefore,
<taxonomicName authority="Pardiñas &amp; Tinoco &amp; Barbière &amp; Ronez &amp; Cañón &amp; Lessa &amp; Koch &amp; Brito, 2022" authorityName="Pardiñas &amp; Tinoco &amp; Barbière &amp; Ronez &amp; Cañón &amp; Lessa &amp; Koch &amp; Brito" authorityYear="2022" box="[1150,1292,1481,1503]" class="Mammalia" family="Cricetidae" kingdom="Animalia" order="Rodentia" pageId="15" pageNumber="1024" phylum="Chordata" rank="tribe" status="TRIB. NOV." tribe="Rhagomyini">Rhagomyini</taxonomicName>
.
</paragraph>
</subSubSection>
</treatment>
</document>