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<document id="0EAA30A55A64C4F200D45603386ECBB3" ID-DOI="10.5281/zenodo.277069" ID-GBIF-Dataset="ec532910-dec5-4ca9-9814-f6d1c02ced77" ID-ISSN="1175-5326" ID-Zenodo-Dep="277069" IM.metadata_approvedBy="felipe" IM.taxonomicNames_approvedBy="felipe" checkinTime="1460268741560" checkinUser="plazi" docAuthor="Neves, Antonio Carlos Da S. A. &amp; Pessôa, Leila Maria" docDate="2011" docId="039A87FEFFCEFFD97C8F71F4FE79F9BC" docLanguage="en" docName="zt02804p024.pdf" docOrigin="Zootaxa 2804" docStyle="DocumentStyle:890A69B780ED73D6DB8551B71C8AC79E.4:Zootaxa.2009-2012.journal_article" docStyleId="890A69B780ED73D6DB8551B71C8AC79E" docStyleName="Zootaxa.2009-2012.journal_article" docStyleVersion="4" docTitle="Thrichomys pachyurus" docType="treatment" docVersion="7" lastPageNumber="18" masterDocId="FFA3FF86FFCDFFDA7C187323FFD2FFCE" masterDocTitle="Morphological distinction of species of Thrichomys (Rodentia: Echimyidae) through ontogeny of cranial and dental characters" masterLastPageNumber="24" masterPageNumber="15" pageNumber="18" updateTime="1698246228798" updateUser="plazi">
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<mods:title id="A76569AE37A147B85C9D4A0FBEAAA75F">Morphological distinction of species of Thrichomys (Rodentia: Echimyidae) through ontogeny of cranial and dental characters</mods:title>
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<mods:namePart id="0895B29BEE92290F35CAB8845655A146">Neves, Antonio Carlos Da S. A.</mods:namePart>
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<mods:namePart id="BCFAA319F0DFD8727A5986370813E7DE">Pessôa, Leila Maria</mods:namePart>
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<mods:date id="23703E888ABA7BC3D3AE15621A43F387">2011</mods:date>
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<mods:number id="5653BA100A15D2EE0786367264E5D989">2804</mods:number>
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<mods:identifier id="6570F69469A2A1C239F6B48FFF156114" type="DOI">10.5281/zenodo.277069</mods:identifier>
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<mods:identifier id="E46EA9CF449860EBDCFF54A322CB3544" type="ISSN">1175-5326</mods:identifier>
<mods:identifier id="E7708343BDFE9D4CD9679D0D33AD70F3" type="Zenodo-Dep">277069</mods:identifier>
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<treatment id="039A87FEFFCEFFD97C8F71F4FE79F9BC" ID-DOI="http://doi.org/10.5281/zenodo.6189812" ID-GBIF-Taxon="119394618" ID-Zenodo-Dep="6189812" LSID="urn:lsid:plazi:treatment:039A87FEFFCEFFD97C8F71F4FE79F9BC" httpUri="http://treatment.plazi.org/id/039A87FEFFCEFFD97C8F71F4FE79F9BC" lastPageNumber="18" pageId="3" pageNumber="18">
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<paragraph id="8B8C36E8FFCEFFD97C8F71F4FE7CFD3F" blockId="3.[151,430,727,753]" box="[151,430,727,753]" pageId="3" pageNumber="18">
<heading id="D0C48184FFCEFFD97C8F71F4FE7CFD3F" bold="true" box="[151,430,727,753]" fontSize="11" level="1" pageId="3" pageNumber="18" reason="1">
<taxonomicName id="4C334D6BFFCEFFD97C8F71F4FE7CFD3F" ID-CoL="56LT4" box="[151,430,727,753]" class="Mammalia" family="Echimyidae" genus="Thrichomys" kingdom="Animalia" order="Rodentia" pageId="3" pageNumber="18" phylum="Chordata" rank="species" species="pachyurus">
<emphasis id="B947EAFAFFCEFFD97C8F71F4FE7CFD3F" bold="true" box="[151,430,727,753]" italics="true" pageId="3" pageNumber="18">Thrichomys pachyurus</emphasis>
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<paragraph id="8B8C36E8FFCEFFD97C8F703DFE79F9BC" blockId="3.[151,1437,798,1650]" pageId="3" pageNumber="18">
Eight ages were described for sample from Barão de Melgaço, identified as
<taxonomicName id="4C334D6BFFCEFFD97FFF7003FBA5FCF8" box="[999,1143,798,823]" class="Mammalia" family="Echimyidae" genus="Thrichomys" kingdom="Animalia" order="Rodentia" pageId="3" pageNumber="18" phylum="Chordata" rank="species" species="pachyurus">
<emphasis id="B947EAFAFFCEFFD97FFF7003FBA5FCF8" box="[999,1143,798,823]" italics="true" pageId="3" pageNumber="18">T. pachyurus</emphasis>
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(
<figureCitation id="13082A6DFFCEFFD9789D703DFB13FCF8" box="[1157,1217,798,822]" captionStart="FIGURE 2" captionStartId="4.[151,250,1898,1921]" captionTargetBox="[261,1307,879,1825]" captionTargetId="figure@4.[261,1307,879,1825]" captionTargetPageId="4" captionText="FIGURE 2. Wear pattern of superior cheekteeth of Thrichomys pachyurus in the sequence of age groups described from younger (A) to older (H). Scale bar is 1 mm." httpUri="https://zenodo.org/record/277071/files/figure.png" pageId="3" pageNumber="18">Fig 2</figureCitation>
.A–H). The level of wear of cheekteeth varies according to age. The pre-molar and first molar are already erupted with occlusal surfaces completely formed at age 1 (
<figureCitation id="13082A6DFFCEFFD97E0F7045FD87FCB0" box="[535,597,870,894]" captionStart="FIGURE 2" captionStartId="4.[151,250,1898,1921]" captionTargetBox="[261,1307,879,1825]" captionTargetId="figure@4.[261,1307,879,1825]" captionTargetPageId="4" captionText="FIGURE 2. Wear pattern of superior cheekteeth of Thrichomys pachyurus in the sequence of age groups described from younger (A) to older (H). Scale bar is 1 mm." httpUri="https://zenodo.org/record/277071/files/figure.png" pageId="3" pageNumber="18">Fig 2</figureCitation>
.A). The second molar starts to erupt at age 2, but its occlusal surface is not completely formed (
<figureCitation id="13082A6DFFCEFFD97D6670A9FE6FFC6C" box="[382,445,906,930]" captionStart="FIGURE 2" captionStartId="4.[151,250,1898,1921]" captionTargetBox="[261,1307,879,1825]" captionTargetId="figure@4.[261,1307,879,1825]" captionTargetPageId="4" captionText="FIGURE 2. Wear pattern of superior cheekteeth of Thrichomys pachyurus in the sequence of age groups described from younger (A) to older (H). Scale bar is 1 mm." httpUri="https://zenodo.org/record/277071/files/figure.png" pageId="3" pageNumber="18">Fig 2</figureCitation>
.B). Until age 3, the specimens are grouped in Juvenile category. The sub-adults specimens at ages 4, 5 and 6 shows the third molar erupted and first signals of wear in the occlusal surface of both first and second molars (
<figureCitation id="13082A6DFFCEFFD97D6170F1FE65FC24" box="[377,439,978,1002]" captionStart="FIGURE 2" captionStartId="4.[151,250,1898,1921]" captionTargetBox="[261,1307,879,1825]" captionTargetId="figure@4.[261,1307,879,1825]" captionTargetPageId="4" captionText="FIGURE 2. Wear pattern of superior cheekteeth of Thrichomys pachyurus in the sequence of age groups described from younger (A) to older (H). Scale bar is 1 mm." httpUri="https://zenodo.org/record/277071/files/figure.png" pageId="3" pageNumber="18">Fig 2</figureCitation>
.E). The first flexi of pre-molar has the format of island only at age 6 (
<figureCitation id="13082A6DFFCEFFD978CB70F1FAC0FC24" box="[1235,1298,978,1002]" captionStart="FIGURE 2" captionStartId="4.[151,250,1898,1921]" captionTargetBox="[261,1307,879,1825]" captionTargetId="figure@4.[261,1307,879,1825]" captionTargetPageId="4" captionText="FIGURE 2. Wear pattern of superior cheekteeth of Thrichomys pachyurus in the sequence of age groups described from younger (A) to older (H). Scale bar is 1 mm." httpUri="https://zenodo.org/record/277071/files/figure.png" pageId="3" pageNumber="18">Fig 2</figureCitation>
.F). At same age, the first flexus of second and third molar are isolated from hipoflexus. The adults at age 7, which shows the basisphenoid-basiocciptal suture obliterated, have only second flexus of third molar opened to margin (
<figureCitation id="13082A6DFFCEFFD9790B7739FA82FBFC" box="[1299,1360,1050,1074]" captionStart="FIGURE 2" captionStartId="4.[151,250,1898,1921]" captionTargetBox="[261,1307,879,1825]" captionTargetId="figure@4.[261,1307,879,1825]" captionTargetPageId="4" captionText="FIGURE 2. Wear pattern of superior cheekteeth of Thrichomys pachyurus in the sequence of age groups described from younger (A) to older (H). Scale bar is 1 mm." httpUri="https://zenodo.org/record/277071/files/figure.png" pageId="3" pageNumber="18">Fig 2</figureCitation>
.G). At age 8, all flexi are enamel island, even as the hipoflexus of pre-molar (
<figureCitation id="13082A6DFFCEFFD97FB4771DFC38FB98" box="[940,1002,1086,1110]" captionStart="FIGURE 2" captionStartId="4.[151,250,1898,1921]" captionTargetBox="[261,1307,879,1825]" captionTargetId="figure@4.[261,1307,879,1825]" captionTargetPageId="4" captionText="FIGURE 2. Wear pattern of superior cheekteeth of Thrichomys pachyurus in the sequence of age groups described from younger (A) to older (H). Scale bar is 1 mm." httpUri="https://zenodo.org/record/277071/files/figure.png" pageId="3" pageNumber="18">Fig 2</figureCitation>
.H). The most cranial characters examined also vary through ontogeny, but some of them are stabilized throughout ontogeny, such as jugal, which were always dorsum-ventrally wide and with transverse ridges along its entire length. The supra-orbital edge always has a crest shape. The vomer is visible in ventral view. The interpremaxilar foramen of
<taxonomicName id="4C334D6BFFCEFFD9785B778FFB06FB0D" box="[1091,1236,1195,1219]" class="Mammalia" family="Echimyidae" genus="Thrichomys" kingdom="Animalia" order="Rodentia" pageId="3" pageNumber="18" phylum="Chordata" rank="species" species="pachyurus">
<emphasis id="B947EAFAFFCEFFD9785B778FFB06FB0D" box="[1091,1236,1195,1219]" italics="true" pageId="3" pageNumber="18">T. pachyurus</emphasis>
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is oval, short and narrow. The incisive foramen of
<taxonomicName id="4C334D6BFFCEFFD97E0977F3FD71FB28" box="[529,675,1230,1255]" class="Mammalia" family="Echimyidae" genus="Thrichomys" kingdom="Animalia" order="Rodentia" pageId="3" pageNumber="18" phylum="Chordata" rank="species" species="pachyurus">
<emphasis id="B947EAFAFFCEFFD97E0977F3FD71FB28" box="[529,675,1230,1255]" italics="true" pageId="3" pageNumber="18">T. pachyurus</emphasis>
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has a strong contrition in the suture between the maxilla and premaxilla (
<figureCitation id="13082A6DFFCEFFD97CE177D1FEEAFAC4" box="[249,312,1266,1290]" captionStart="FIGURE 4" captionStartId="6.[151,250,680,703]" captionTargetBox="[203,1383,193,658]" captionTargetId="figure@6.[203,1383,193,659]" captionTargetPageId="6" captionText="FIGURE 4. The shapes of interpremaxilar foramina (above) and incisive foramina of: (A) Thrichomys laurentius, (B) T. pachyurus and (C) T. inermis. Scale bar is 5 mm." httpUri="https://zenodo.org/record/277073/files/figure.png" pageId="3" pageNumber="18">Fig 4</figureCitation>
.B). The ventral crest of the infra-orbital foramen, poorly developed, is located above the edge of the infra-orbital foramen. The hamular process is large in tip and keeps a rectangular shape (
<figureCitation id="13082A6DFFCEFFD9786C7635FB63FAE0" box="[1140,1201,1302,1326]" captionStart="FIGURE 5" captionStartId="6.[151,250,1288,1311]" captionTargetBox="[270,1316,783,1267]" captionTargetId="figure@6.[270,1316,783,1267]" captionTargetPageId="6" captionText="FIGURE 5. The shapes of the hamular processes of: (A) Thrichomys laurentius, (B) T. pachyurus and (C) T. inermis. Scale bar is 1 mm." httpUri="https://zenodo.org/record/277074/files/figure.png" pageId="3" pageNumber="18">Fig 5</figureCitation>
.B). The anterior palatal foramens, separated by the well developed median crest of the palate, are located above the pre-molars, near to incisive foramen. The mesopterygoid fossa has a &quot;U&quot;-shape. The nasal bones reach the posterior limit of pre-maxilla at ages 2, 7 and 8. Only at age 1 the supra-orbital crest does not extend to suture between frontal and squamosal. The post-orbital process of zygomatic arch is formed mainly by squamosal in the most ages, but at ages 8 and 4 the participation of jugal is equal to squamosal. At age 6 only jugal forms that process. Juveniles show the pre-maxillary portion of septum of incisive foramen longer than half of length of foramen. In sub-adults and adults this is half the length of the incisive foramen. The palate reaches or exceeds the posterior margin of the last molar. The posterior palatal foramens are located at posterior limit of palate. The mesopterygoid fossa extends to medial portion of the last molar.
</paragraph>
</subSubSection>
</treatment>
</document>
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