271 lines
33 KiB
XML
271 lines
33 KiB
XML
<document id="44B6A99C436CA86831899261FBCC9777" ID-DOI="10.11646/zootaxa.4804.1.1" ID-ISSN="1175-5326" ID-Zenodo-Dep="3927094" ID-ZooBank="8C1C1703-9BBC-4B33-8045-78BDD9738F51" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.tables_requiresApprovalFor="existingObjects,plazi" IM.taxonomicNames_approvedBy="felipe" checkinTime="1593672611012" checkinUser="plazi" docAuthor="Westrop, Madison Armstrong Stephen R. & Eoff, Jennifer D." docDate="2020" docId="03F76D37FFA2FFC66BD2E024FCFC901D" docLanguage="en" docName="zootaxa.4804.1.1.pdf" docOrigin="Zootaxa 4804 (1)" docStyle="DocumentStyle:5EBBA59367AD13919D70D935FA04F6A3.14:Zootaxa.2013-.monograph" docStyleId="5EBBA59367AD13919D70D935FA04F6A3" docStyleName="Zootaxa.2013-.monograph" docStyleVersion="14" docTitle="Blountia gaspensis Rasetti 1946" docType="treatment" docVersion="3" lastPageNumber="15" masterDocId="FFCE154FFFAFFFC86B45E438FF8E9206" masterDocTitle="Systematics of a survivor: the Cambrian kingstoniid trilobite Blountia Walcott, 1916 across the Marjuman-Steptoean (Guzhangian-Paibian) extinction interval in Laurentian North America" masterLastPageNumber="79" masterPageNumber="1" pageNumber="14" updateTime="1698776919363" updateUser="plazi">
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<mods:title id="2978D4E45B8F92BEFEA5858C7F12FB50">Systematics of a survivor: the Cambrian kingstoniid trilobite Blountia Walcott, 1916 across the Marjuman-Steptoean (Guzhangian-Paibian) extinction interval in Laurentian North America</mods:title>
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<mods:namePart id="22E59E11110BF809F5D2F19C37065C4B">Westrop, Madison Armstrong Stephen R.</mods:namePart>
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<mods:namePart id="0E5A27696019D5A9FF3C10D6F36F4381">Eoff, Jennifer D.</mods:namePart>
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<mods:title id="B8A7F35EA333D720507B78281ADF8EF4">Zootaxa</mods:title>
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<mods:part id="B610C63107B24FF94AF75632649B127F">
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<mods:date id="FC7596BBB1661C00D6B3A5500BFE3DDA">2020</mods:date>
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<mods:number id="7BAC0FA1F2B9DF5DAA3E5AE889BF9875">2020-06-30</mods:number>
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<mods:number id="633FF168AE9F97CF33A9C76478FDCE65">4804</mods:number>
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<mods:classification id="B91F86970A219763A3D4D1317C7B02FC">journal article</mods:classification>
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<mods:identifier id="521715D016D506674448B59263EA5EFC" type="DOI">10.11646/zootaxa.4804.1.1</mods:identifier>
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<subSubSection id="C3448FAAFFA2FFC56BD2E024FDAB9630" box="[151,549,1052,1079]" pageId="13" pageNumber="14" type="nomenclature">
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<paragraph id="8BE1DC21FFA2FFC56BD2E024FDAB9630" blockId="13.[151,549,1052,1115]" box="[151,549,1052,1079]" pageId="13" pageNumber="14">
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<heading id="D0A96B4DFFA2FFC56BD2E024FDAB9630" bold="true" box="[151,549,1052,1079]" fontSize="11" level="1" pageId="13" pageNumber="14" reason="1">
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<taxonomicName id="4C5EA7A2FFA2FFC56BD2E024FDAB9630" authority="Rasetti, 1946" authorityName="Rasetti" authorityYear="1946" box="[151,549,1052,1079]" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="13" pageNumber="14" phylum="Arthropoda" rank="species" species="gaspensis">
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<emphasis id="B92A0033FFA2FFC56BD2E024FDAB9630" bold="true" box="[151,549,1052,1079]" pageId="13" pageNumber="14">
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<emphasis id="B92A0033FFA2FFC56BD2E024FEF29631" bold="true" box="[151,380,1052,1079]" italics="true" pageId="13" pageNumber="14">Blountia gaspensis</emphasis>
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<bibRefCitation id="EFCFA1D0FFA2FFC56AC1E024FDAB9630" author="Rasetti, F." box="[388,549,1052,1078]" pageId="13" pageNumber="14" pagination="442 - 446" refId="ref23810" refString="Rasetti, F. (1946) Early Upper Cambrian trilobites from western Gaspe. Journal of Paleontology, 20, 442 - 446." type="journal article" year="1946">Rasetti, 1946</bibRefCitation>
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</emphasis>
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</taxonomicName>
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</heading>
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</paragraph>
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</subSubSection>
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<subSubSection id="C3448FAAFFA2FFC56BD2E078FD6C969B" pageId="13" pageNumber="14" type="description">
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<paragraph id="8BE1DC21FFA2FFC56BD2E078FE4A965D" blockId="13.[151,549,1052,1115]" box="[151,452,1088,1115]" pageId="13" pageNumber="14">
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<figureCitation id="1365C0A4FFA2FFC56BD2E078FF7A965D" box="[151,244,1088,1115]" captionStart="PLATE 10" captionStartId="44.[151,234,1897,1922]" captionText="PLATE 10. Blountia gaspensis Rasetti, 1946, lower Grosses-Roches Formation, Grosse-Roches, Matane County, Gaspé Peninsula, eastern Quebec, boulder G-28. 1–3. Cranidium, paratype, GSC 140488 (LU 1004d), dorsal, lateral and anterior views, x8 (previously unillustrated). 4–6. Pygidium, paratype, GSC 140489 (LU 1004b), dorsal, lateral and posterior views, x6.5 (illustrated by Rasetti 1946, pl. 67, fig. 9). 7–9. Pygidium, paratype, GSC 140490 (LU 1004c), dorsal, posterior and lateral views, x6.5 (illustrated by Rasetti 1946, pl. 67, fig. 10)." pageId="13" pageNumber="14">Plate 10</figureCitation>
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,
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<figureCitation id="1365C0A4FFA2FFC56A45E078FED2965D" box="[256,348,1088,1115]" captionStart="PLATE 11" captionStartId="46.[151,234,1839,1864]" captionText="PLATE 11. Blountia gaspensis Rasetti, 1946, lower Grosses-Roches Formation, Grosse-Roches, Matane County, Gaspé Peninsula, eastern Quebec, boulder G-28. 1–3. Cranidium, holotype, GSC 140491 (LU 1004a), lateral, dorsal and anterior views, x10 (illustrated by Rasetti 1946, pl. 67, figs 7, 8). 4. Pygidium, paratype, GSC 140492 (LU 1004e), dorsal view, x6.5 (previously unillustrated). Blountia newfoundlandensis n. sp., Downes Point Member, Shallow Bay Formation, north shore of the Cow Head Peninsula, western Newfoundland, boulder CH 48. 5. Cranidium, paratype, GSC 140493, dorsal view, x19. 6, 7. Cranidium, paratype, GSC 140494, lateral and dorsal views, x20. 8–10. Cranidium, paratype, GSC 140495, dorsal, lateral and anterior views, x14." pageId="13" pageNumber="14">Plate 11</figureCitation>
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, figs 1–4
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</paragraph>
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<paragraph id="8BE1DC21FFA2FFC56BD2E0BCFD6C969B" blockId="13.[151,738,1156,1181]" box="[151,738,1156,1181]" pageId="13" pageNumber="14">
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1946
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<taxonomicName id="4C5EA7A2FFA2FFC56B95E0BDFE6E969B" authority="Rasetti" authorityName="Rasetti" authorityYear="1946" box="[208,480,1156,1181]" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="13" pageNumber="14" phylum="Arthropoda" rank="species" species="gaspensis">
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<emphasis id="B92A0033FFA2FFC56B95E0BDFE1F969A" box="[208,401,1157,1181]" italics="true" pageId="13" pageNumber="14">Blountia gaspensis</emphasis>
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Rasetti
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</taxonomicName>
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, p. 446, pl. 67, figs 7–10.
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</paragraph>
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</subSubSection>
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<subSubSection id="C3448FAAFFA2FFC56BD2E0F2FAEF979F" pageId="13" pageNumber="14" type="diagnosis">
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<paragraph id="8BE1DC21FFA2FFC56BD2E0F2FAEF979F" blockId="13.[151,1437,1226,2046]" pageId="13" pageNumber="14">
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<emphasis id="B92A0033FFA2FFC56BD2E0F2FE9C96E3" bold="true" box="[151,274,1226,1253]" pageId="13" pageNumber="14">Diagnosis.</emphasis>
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Gently rounded anterior cranidial margin. Frontal area occupies 28% of cranidial length; down-sloping preglabellar field and slightly shorter, nearly flat anterior border differentiated largely by change in slope. Anterior border furrow shallow but clearly defined. Facial sutures diverge conspicuously anteriorly from palpebral lobes. Subtrapezoidal glabella with well-rounded front. Pygidium with short border of even width equal to about one-fifth (19%; 17–21) pygidial length (sag); separated from pleural field by strongly incised border furrow. Internal mould expresses at least nine axial rings and terminal piece of two segments, and faint, straight interpleural furrows.
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</paragraph>
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||
</subSubSection>
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||
<subSubSection id="C3448FAAFFA2FFC56B82E19AFE5C9474" pageId="13" pageNumber="14" type="materials_examined">
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<paragraph id="8BE1DC21FFA2FFC56B82E19AFE28942F" blockId="13.[151,1437,1226,2046]" pageId="13" pageNumber="14">
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<emphasis id="B92A0033FFA2FFC56B82E19AFEB897BB" bold="true" box="[199,310,1442,1469]" pageId="13" pageNumber="14">Material.</emphasis>
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<materialsCitation id="3B36D67CFFA2FFC56A78E19BFE28942F" collectingDate="88-04-14" collectingDateMax="92-04-14" collectingDateMin="88-04-14" collectionCode="GSC" county="Matane County" location="Grosses-Roches" municipality="lower Grosses-Roches Formation" pageId="13" pageNumber="14" specimenCode="LU 1004" specimenCount="2" stateProvince="Quebec" typeStatus="holotype">
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<typeStatus id="54E56283FFA2FFC56A78E19BFE2B97BB" box="[317,421,1443,1469]" pageId="13" pageNumber="14" type="holotype">Holotype</typeStatus>
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cranidium (
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<collectionCode id="ED4F44E4FFA2FFC5696EE19BFDED97BB" box="[555,611,1443,1469]" country="Canada" httpUri="http://grbio.org/cool/52gs-z31g" name="Geological Survey of Canada" pageId="13" pageNumber="14">GSC</collectionCode>
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<date id="FFE0FAE1FFA2FFC5692CE19BFD3397BB" box="[617,701,1443,1469]" pageId="13" pageNumber="14" value="91-04-14">
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<collectingDate id="EFA40309FFA2FFC5692CE19BFD3397BB" box="[617,701,1443,1469]" pageId="13" pageNumber="14" value="91-04-14">140491</collectingDate>
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</date>
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[
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<specimenCode id="DBF8745AFFA2FFC5698FE19CFCBA97BB" box="[714,820,1442,1470]" collectionCode="LU" country="Russia" name="St. Petersburg University" pageId="13" pageNumber="14">LU 1004</specimenCode>
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a], Pl. 11, figs 1–3), a
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<typeStatus id="54E56283FFA2FFC56F61E19CFB0A97B8" box="[1060,1156,1444,1470]" pageId="13" pageNumber="14" type="paratype">paratype</typeStatus>
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cranidium (
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||
<collectionCode id="ED4F44E4FFA2FFC56E4FE19BFACC97BB" box="[1290,1346,1443,1469]" country="Canada" httpUri="http://grbio.org/cool/52gs-z31g" name="Geological Survey of Canada" pageId="13" pageNumber="14">GSC</collectionCode>
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||
<date id="FFE0FAE1FFA2FFC56E0DE19BFA1297BB" box="[1352,1436,1443,1469]" pageId="13" pageNumber="14" value="88-04-14">
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||
<collectingDate id="EFA40309FFA2FFC56E0DE19BFA1297BB" box="[1352,1436,1443,1469]" pageId="13" pageNumber="14" value="88-04-14">140488</collectingDate>
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||
</date>
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||
[
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||
<specimenCode id="DBF8745AFFA2FFC56BDBE1F0FE8697E7" box="[158,264,1478,1506]" collectionCode="LU" country="Russia" name="St. Petersburg University" pageId="13" pageNumber="14">LU 1004</specimenCode>
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d], Pl. 10, figs 1–3), and three pygidia (
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<collectionCode id="ED4F44E4FFA2FFC569FDE1FFFD7E97E7" box="[696,752,1479,1505]" country="Canada" httpUri="http://grbio.org/cool/52gs-z31g" name="Geological Survey of Canada" pageId="13" pageNumber="14">GSC</collectionCode>
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||
<date id="FFE0FAE1FFA2FFC569B2E1FFFCC597E7" box="[759,843,1479,1505]" pageId="13" pageNumber="14" value="89-04-14">
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||
<collectingDate id="EFA40309FFA2FFC569B2E1FFFCC597E7" box="[759,843,1479,1505]" pageId="13" pageNumber="14" value="89-04-14">140489</collectingDate>
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</date>
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||
[
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||
<specimenCode id="DBF8745AFFA2FFC5681DE1F0FC4D97E7" box="[856,963,1478,1506]" collectionCode="LU" country="Russia" name="St. Petersburg University" pageId="13" pageNumber="14">LU 1004</specimenCode>
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b],
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<collectionCode id="ED4F44E4FFA2FFC568A6E1FFFB9797E7" box="[995,1049,1479,1505]" country="Canada" httpUri="http://grbio.org/cool/52gs-z31g" name="Geological Survey of Canada" pageId="13" pageNumber="14">GSC</collectionCode>
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||
<date id="FFE0FAE1FFA2FFC56F65E1FFFBFA97E7" box="[1056,1140,1479,1505]" pageId="13" pageNumber="14" value="90-04-14">
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<collectingDate id="EFA40309FFA2FFC56F65E1FFFBFA97E7" box="[1056,1140,1479,1505]" pageId="13" pageNumber="14" value="90-04-14">140490</collectingDate>
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</date>
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||
[
|
||
<specimenCode id="DBF8745AFFA2FFC56FC4E1F0FB6397E7" box="[1153,1261,1478,1506]" collectionCode="LU" country="Russia" name="St. Petersburg University" pageId="13" pageNumber="14">LU 1004</specimenCode>
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c],
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<collectionCode id="ED4F44E4FFA2FFC56E4EE1FFFACF97E7" box="[1291,1345,1479,1505]" country="Canada" httpUri="http://grbio.org/cool/52gs-z31g" name="Geological Survey of Canada" pageId="13" pageNumber="14">GSC</collectionCode>
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||
<date id="FFE0FAE1FFA2FFC56E0DE1FFFA1297E7" box="[1352,1436,1479,1505]" pageId="13" pageNumber="14" value="92-04-14">
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<collectingDate id="EFA40309FFA2FFC56E0DE1FFFA1297E7" box="[1352,1436,1479,1505]" pageId="13" pageNumber="14" value="92-04-14">140492</collectingDate>
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</date>
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||
[
|
||
<specimenCode id="DBF8745AFFA2FFC56BDBE1D4FE899403" box="[158,263,1514,1542]" collectionCode="LU" country="Russia" name="St. Petersburg University" pageId="13" pageNumber="14">LU 1004</specimenCode>
|
||
e], Pl. 10, figs 4–9, Pl. 11, fig. 4) from
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||
<collectingMunicipality id="6B85465BFFA2FFC569ECE1D3FBAE9403" box="[681,1056,1515,1541]" pageId="13" pageNumber="14">lower Grosses-Roches Formation</collectingMunicipality>
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||
,
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||
<location id="8E818AFAFFA2FFC56F6FE1D3FB6F9403" LSID="urn:lsid:plazi:treatment:03F76D37FFA2FFC66BD2E024FCFC901D:8E818AFAFFA2FFC56F6FE1D3FB6F9403" box="[1066,1249,1515,1541]" county="Matane County" municipality="lower Grosses-Roches Formation" name="Grosses-Roches" pageId="13" pageNumber="14" stateProvince="Quebec">Grosses-Roches</location>
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||
,
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||
<collectingCounty id="6280A4ADFFA2FFC56FAEE1D4FA169403" box="[1259,1432,1515,1542]" pageId="13" pageNumber="14">Matane County</collectingCounty>
|
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,
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||
<location id="8E818AFAFFA2FFC56BD2E228FEB0942F" LSID="urn:lsid:plazi:treatment:03F76D37FFA2FFC66BD2E024FCFC901D:8E818AFAFFA2FFC56BD2E228FEB0942F" box="[151,318,1551,1578]" county="Matane County" municipality="lower Grosses-Roches Formation" name="western Gaspe" pageId="13" pageNumber="14" stateProvince="Quebec">western Gaspé</location>
|
||
,
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||
<collectingRegion id="499A12C3FFA2FFC56A0CE237FE2C942F" box="[329,418,1551,1577]" country="Canada" name="Quebec" pageId="13" pageNumber="14">Quebec</collectingRegion>
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||
.
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||
</materialsCitation>
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||
</paragraph>
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||
<paragraph id="8BE1DC21FFA2FFC56B82E20AFE5C9474" blockId="13.[151,1437,1226,2046]" pageId="13" pageNumber="14">
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||
<emphasis id="B92A0033FFA2FFC56B82E20AFED4944B" bold="true" box="[199,346,1586,1613]" pageId="13" pageNumber="14">Occurrence.</emphasis>
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||
<materialsCitation id="3B36D67CFFA2FFC56A21E20CFE439474" county="Matane County" location="western Gaspe" municipality="Lower Grosses-Roches Formation" pageId="13" pageNumber="14" specimenCount="1" stateProvince="Quebec">
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||
<collectingMunicipality id="6B85465BFFA2FFC56A21E20CFD7E944B" box="[356,752,1587,1614]" pageId="13" pageNumber="14">Lower Grosses-Roches Formation</collectingMunicipality>
|
||
, Grosses-Roches,
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||
<collectingCounty id="6280A4ADFFA2FFC56880E20CFBF9944B" box="[965,1143,1587,1614]" pageId="13" pageNumber="14">Matane County</collectingCounty>
|
||
,
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||
<location id="8E818AFAFFA2FFC56FC3E20CFABF944B" LSID="urn:lsid:plazi:treatment:03F76D37FFA2FFC66BD2E024FCFC901D:8E818AFAFFA2FFC56FC3E20CFABF944B" box="[1158,1329,1587,1614]" county="Matane County" municipality="Lower Grosses-Roches Formation" name="western Gaspe" pageId="13" pageNumber="14" stateProvince="Quebec">western Gaspé</location>
|
||
,
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||
<collectingRegion id="499A12C3FFA2FFC56E05E20BFA16944B" box="[1344,1432,1587,1613]" country="Canada" name="Quebec" pageId="13" pageNumber="14">Quebec</collectingRegion>
|
||
, boulder G28 (
|
||
<bibRefCitation id="EFCFA1D0FFA2FFC56A77E26FFE4B9474" author="Rasetti, F." box="[306,453,1623,1650]" pageId="13" pageNumber="14" pagination="442 - 446" refId="ref23810" refString="Rasetti, F. (1946) Early Upper Cambrian trilobites from western Gaspe. Journal of Paleontology, 20, 442 - 446." type="journal article" year="1946">Rasetti 1946</bibRefCitation>
|
||
)
|
||
</materialsCitation>
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||
.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="C3448FAAFFA2FFC66B82E242FCFC901D" lastPageId="14" lastPageNumber="15" pageId="13" pageNumber="14" type="discussion">
|
||
<paragraph id="8BE1DC21FFA2FFC56B82E242FAC195DF" blockId="13.[151,1437,1226,2046]" pageId="13" pageNumber="14">
|
||
<emphasis id="B92A0033FFA2FFC56B82E242FEC29493" bold="true" box="[199,332,1658,1685]" pageId="13" pageNumber="14">Discussion.</emphasis>
|
||
<bibRefCitation id="EFCFA1D0FFA2FFC56A17E244FE599493" author="Pratt, B. R." box="[338,471,1659,1686]" pageId="13" pageNumber="14" pagination="1 - 179" refId="ref23771" refString="Pratt, B. R. (1992) Trilobites of the Marjuman and Steptoean stages (Upper Cambrian), Rabbitkettle Formation, southern Mackenzie Mountains, northwest Canada. Palaeontographica Canadiana, 9, 1 - 179" type="journal article" year="1992">Pratt (1992)</bibRefCitation>
|
||
suggested that
|
||
<taxonomicName id="4C5EA7A2FFA2FFC569C5E243FCDD9493" authorityName="Rasetti" authorityYear="1946" box="[640,851,1659,1685]" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="13" pageNumber="14" phylum="Arthropoda" rank="species" species="gaspensis">
|
||
<emphasis id="B92A0033FFA2FFC569C5E243FCDD9493" box="[640,851,1659,1685]" italics="true" pageId="13" pageNumber="14">Blountia gaspensis</emphasis>
|
||
</taxonomicName>
|
||
is a junior synonym of
|
||
<taxonomicName id="4C5EA7A2FFA2FFC56F10E244FE0794BF" authority="Duncan, in Lochman & Duncan, 1944" authorityName="Duncan, in Lochman & Duncan" authorityYear="1944" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="13" pageNumber="14" phylum="Arthropoda" rank="species" species="beltensis">
|
||
<emphasis id="B92A0033FFA2FFC56F10E244FBE89493" box="[1109,1126,1660,1685]" italics="true" pageId="13" pageNumber="14">B</emphasis>
|
||
.
|
||
<emphasis id="B92A0033FFA2FFC56F36E243FB5B9493" box="[1139,1237,1659,1685]" italics="true" pageId="13" pageNumber="14">beltensis</emphasis>
|
||
Duncan, in
|
||
<bibRefCitation id="EFCFA1D0FFA2FFC56E1CE243FE0794BF" author="Lochman, C. & Duncan, D." pageId="13" pageNumber="14" pagination="1 - 172" refId="ref23573" refString="Lochman, C. & Duncan, D. (1944) Early Upper Cambrian faunas of Central Montana. Geological Society of America Special Papers, 54, 1 - 172. https: // doi. org / 10.1130 / SPE 54 - p 1" type="journal article" year="1944">Lochman & Duncan, 1944</bibRefCitation>
|
||
</taxonomicName>
|
||
, but there are clear differences between these species.
|
||
<typeStatus id="54E56283FFA2FFC568A3E298FBC694BC" box="[998,1096,1696,1722]" pageId="13" pageNumber="14" type="paratype">Paratype</typeStatus>
|
||
pygidia (
|
||
<bibRefCitation id="EFCFA1D0FFA2FFC56FF5E2A7FF5C94DB" author="Lochman, C. & Duncan, D." pageId="13" pageNumber="14" pagination="1 - 172" refId="ref23573" refString="Lochman, C. & Duncan, D. (1944) Early Upper Cambrian faunas of Central Montana. Geological Society of America Special Papers, 54, 1 - 172. https: // doi. org / 10.1130 / SPE 54 - p 1" type="journal article" year="1944">Lochman & Duncan, 1944</bibRefCitation>
|
||
, pl. 11, figs 20–22, 24) show that the border furrow of
|
||
<taxonomicName id="4C5EA7A2FFA2FFC5681FE2FCFC5094DB" authorityName="Duncan, in Lochman & Duncan" authorityYear="1944" box="[858,990,1731,1758]" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="13" pageNumber="14" phylum="Arthropoda" rank="species" species="beltensis">
|
||
<emphasis id="B92A0033FFA2FFC5681FE2FCFCE594DB" box="[858,875,1732,1757]" italics="true" pageId="13" pageNumber="14">B</emphasis>
|
||
.
|
||
<emphasis id="B92A0033FFA2FFC56839E2FBFC5094DB" box="[892,990,1731,1757]" italics="true" pageId="13" pageNumber="14">beltensis</emphasis>
|
||
</taxonomicName>
|
||
is effaced posteriorly even on internal moulds, and there is little change in slope in the lateral profile between the pleural field and border. In contrast,
|
||
<taxonomicName id="4C5EA7A2FFA2FFC56EC1E2D0FE8A9523" authorityName="Rasetti" authorityYear="1946" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="13" pageNumber="14" phylum="Arthropoda" rank="species" species="gaspensis">
|
||
<emphasis id="B92A0033FFA2FFC56EC1E2D0FA1B9507" box="[1412,1429,1768,1793]" italics="true" pageId="13" pageNumber="14">B</emphasis>
|
||
.
|
||
<emphasis id="B92A0033FFA2FFC56BD2E334FE8A9523" box="[151,260,1804,1829]" italics="true" pageId="13" pageNumber="14">gaspensis</emphasis>
|
||
</taxonomicName>
|
||
has a conspicuous, continuous pygidial border furrow marked in part by a sharp break in slope between the pleural field and the flatter posterior border (Pl. 10, figs 4–9). Cranidia of
|
||
<taxonomicName id="4C5EA7A2FFA2FFC568B6E308FBFD954F" authorityName="Duncan, in Lochman & Duncan" authorityYear="1944" box="[1011,1139,1839,1866]" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="13" pageNumber="14" phylum="Arthropoda" rank="species" species="beltensis">
|
||
<emphasis id="B92A0033FFA2FFC568B6E308FB8A954F" box="[1011,1028,1840,1865]" italics="true" pageId="13" pageNumber="14">B</emphasis>
|
||
.
|
||
<emphasis id="B92A0033FFA2FFC56F54E317FBFD954F" box="[1041,1139,1839,1865]" italics="true" pageId="13" pageNumber="14">beltensis</emphasis>
|
||
</taxonomicName>
|
||
appear to have a distinctly shorter preglabellar field that is roughly equal to (
|
||
<bibRefCitation id="EFCFA1D0FFA2FFC56995E36BFB8B956B" author="Lochman, C. & Duncan, D." box="[720,1029,1875,1902]" pageId="13" pageNumber="14" pagination="1 - 172" refId="ref23573" refString="Lochman, C. & Duncan, D. (1944) Early Upper Cambrian faunas of Central Montana. Geological Society of America Special Papers, 54, 1 - 172. https: // doi. org / 10.1130 / SPE 54 - p 1" type="journal article" year="1944">Lochman & Duncan, 1944</bibRefCitation>
|
||
, pl. 11, fig. 25), or less than (
|
||
<bibRefCitation id="EFCFA1D0FFA2FFC56E1DE36BFE059597" author="Lochman, C. & Duncan, D." pageId="13" pageNumber="14" pagination="1 - 172" refId="ref23573" refString="Lochman, C. & Duncan, D. (1944) Early Upper Cambrian faunas of Central Montana. Geological Society of America Special Papers, 54, 1 - 172. https: // doi. org / 10.1130 / SPE 54 - p 1" type="journal article" year="1944">Lochman & Duncan, 1944</bibRefCitation>
|
||
, pl. 11, fig. 26 [
|
||
<typeStatus id="54E56283FFA2FFC5697FE34EFD2B9597" box="[570,677,1910,1937]" pageId="13" pageNumber="14" type="holotype">holotype</typeStatus>
|
||
]), anterior border length. Cranidia from the Rabbittkettle Formation identified as
|
||
<taxonomicName id="4C5EA7A2FFA2FFC56A6FE3A4FE2295B3" authorityName="Duncan, in Lochman & Duncan" authorityYear="1944" box="[298,428,1947,1974]" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="13" pageNumber="14" phylum="Arthropoda" rank="species" species="beltensis">
|
||
<emphasis id="B92A0033FFA2FFC56A6FE3A4FEB595B3" box="[298,315,1948,1973]" italics="true" pageId="13" pageNumber="14">B</emphasis>
|
||
.
|
||
<emphasis id="B92A0033FFA2FFC56A0FE3A3FE2295B3" box="[330,428,1947,1973]" italics="true" pageId="13" pageNumber="14">beltensis</emphasis>
|
||
</taxonomicName>
|
||
by
|
||
<bibRefCitation id="EFCFA1D0FFA2FFC56A92E3A4FDD695B3" author="Pratt, B. R." box="[471,600,1947,1974]" pageId="13" pageNumber="14" pagination="1 - 179" refId="ref23771" refString="Pratt, B. R. (1992) Trilobites of the Marjuman and Steptoean stages (Upper Cambrian), Rabbitkettle Formation, southern Mackenzie Mountains, northwest Canada. Palaeontographica Canadiana, 9, 1 - 179" type="journal article" year="1992">Pratt (1992</bibRefCitation>
|
||
, pl. 24, figs 7–9, 12) also have shorter preglabellar fields, and the pygidia resemble the types in showing effacement of the border furrow posteriorly (e.g.,
|
||
<bibRefCitation id="EFCFA1D0FFA2FFC56F5AE3F8FB1395DF" author="Pratt, B. R." box="[1055,1181,1983,2010]" pageId="13" pageNumber="14" pagination="1 - 179" refId="ref23771" refString="Pratt, B. R. (1992) Trilobites of the Marjuman and Steptoean stages (Upper Cambrian), Rabbitkettle Formation, southern Mackenzie Mountains, northwest Canada. Palaeontographica Canadiana, 9, 1 - 179" type="journal article" year="1992">Pratt, 1992</bibRefCitation>
|
||
, pl. 24, fig. 10).
|
||
</paragraph>
|
||
<paragraph id="8BE1DC21FFA2FFC66B82E3DBFB11938D" blockId="13.[151,1437,1226,2046]" lastBlockId="14.[151,1437,152,539]" lastPageId="14" lastPageNumber="15" pageId="13" pageNumber="14">
|
||
Like
|
||
<taxonomicName id="4C5EA7A2FFA2FFC56A45E3DCFE6695FB" authorityName="Westrop & Eoff" authorityYear="2020" box="[256,488,2019,2045]" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="13" pageNumber="14" phylum="Arthropoda" rank="species" species="morgancreekensis">
|
||
<emphasis id="B92A0033FFA2FFC56A45E3DCFE6695FB" box="[256,488,2019,2045]" italics="true" pageId="13" pageNumber="14">B. morgancreekensis</emphasis>
|
||
</taxonomicName>
|
||
(Pl. 17, figs 1–11, Pl. 18) from the Riley Formation of central
|
||
<collectingRegion id="499A12C3FFA2FFC56FDDE3DCFB5295F8" box="[1176,1244,2020,2046]" country="United States of America" name="Texas" pageId="13" pageNumber="14">Texas</collectingRegion>
|
||
,
|
||
<taxonomicName id="4C5EA7A2FFA2FFC56FA3E3DCFAFF95FB" authorityName="Rasetti" authorityYear="1946" box="[1254,1393,2020,2046]" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="13" pageNumber="14" phylum="Arthropoda" rank="species" species="gaspensis">
|
||
<emphasis id="B92A0033FFA2FFC56FA3E3DCFB7995FB" box="[1254,1271,2020,2045]" italics="true" pageId="13" pageNumber="14">B</emphasis>
|
||
.
|
||
<emphasis id="B92A0033FFA2FFC56E41E3DCFAFF95FB" box="[1284,1393,2020,2045]" italics="true" pageId="13" pageNumber="14">gaspensis</emphasis>
|
||
</taxonomicName>
|
||
has a long frontal area (equal to 28% of cranidial length in both species), a glabella whose width is equal to 75% length, and divergent anterior branches of the facial sutures. However, the former differs by having a more rounded anterior cranidial margin, a shorter palpebral lobe (11% of cranidial length (sag.), versus 17% in
|
||
<taxonomicName id="4C5EA7A2FFA1FFC66F38E4DAFA8492FD" authorityName="Rasetti" authorityYear="1946" box="[1149,1290,225,251]" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="14" pageNumber="15" phylum="Arthropoda" rank="species" species="gaspensis">
|
||
<emphasis id="B92A0033FFA1FFC66F38E4DAFB0092FD" box="[1149,1166,226,251]" italics="true" pageId="14" pageNumber="15">B</emphasis>
|
||
.
|
||
<emphasis id="B92A0033FFA1FFC66FD8E4DAFA8492FD" box="[1181,1290,226,251]" italics="true" pageId="14" pageNumber="15">gaspensis</emphasis>
|
||
</taxonomicName>
|
||
), and a shallower anterior border furrow. The pygidia are similar in outline, and both species display a well-segmented axis on internal moulds. However, the pygidia of
|
||
<taxonomicName id="4C5EA7A2FFA1FFC6692AE512FD729345" authorityName="Rasetti" authorityYear="1946" box="[623,764,297,323]" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="14" pageNumber="15" phylum="Arthropoda" rank="species" species="gaspensis">
|
||
<emphasis id="B92A0033FFA1FFC6692AE512FD0E9345" box="[623,640,298,323]" italics="true" pageId="14" pageNumber="15">B</emphasis>
|
||
.
|
||
<emphasis id="B92A0033FFA1FFC669CAE512FD729345" box="[655,764,298,323]" italics="true" pageId="14" pageNumber="15">gaspensis</emphasis>
|
||
</taxonomicName>
|
||
have a more clearly defined border furrow. In addition, the sharp break in slope between the pleural field and the nearly flat border that contrasts with the more evenly downsloping border in
|
||
<taxonomicName id="4C5EA7A2FFA1FFC66A18E54AFDC9938D" authorityName="Westrop & Eoff" authorityYear="2020" box="[349,583,369,395]" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="14" pageNumber="15" phylum="Arthropoda" rank="species" species="morgancreekensis">
|
||
<emphasis id="B92A0033FFA1FFC66A18E54AFDC9938D" box="[349,583,369,395]" italics="true" pageId="14" pageNumber="15">B. morgancreekensis</emphasis>
|
||
</taxonomicName>
|
||
(compare Pl. 10, figs 6, 8 and Pl. 19, figs 3, 4, 9, 10).
|
||
</paragraph>
|
||
<paragraph id="8BE1DC21FFA1FFC66B82E5ADFCFC901D" blockId="14.[151,1437,152,539]" pageId="14" pageNumber="15">
|
||
Cranidia of
|
||
<taxonomicName id="4C5EA7A2FFA1FFC66A0EE5ADFD8593A9" authorityName="Westrop & Eoff" authorityYear="2020" box="[331,523,405,431]" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="14" pageNumber="15" phylum="Arthropoda" rank="species" species="angelae">
|
||
<emphasis id="B92A0033FFA1FFC66A0EE5ADFD8593A9" box="[331,523,405,431]" italics="true" pageId="14" pageNumber="15">Blountia angelae</emphasis>
|
||
</taxonomicName>
|
||
have similar proportions to
|
||
<taxonomicName id="4C5EA7A2FFA1FFC66801E5AEFC4193A9" authorityName="Rasetti" authorityYear="1946" box="[836,975,405,431]" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="14" pageNumber="15" phylum="Arthropoda" rank="species" species="gaspensis">
|
||
<emphasis id="B92A0033FFA1FFC66801E5AEFCDB93A9" box="[836,853,406,431]" italics="true" pageId="14" pageNumber="15">B</emphasis>
|
||
.
|
||
<emphasis id="B92A0033FFA1FFC66827E5AEFC4193A9" box="[866,975,406,431]" italics="true" pageId="14" pageNumber="15">gaspensis</emphasis>
|
||
</taxonomicName>
|
||
, although the anterior border is relatively longer, and the anterior cranidial margin is strongly rounded (compare Pl. 10, figs 1–3, Pl. 11, figs 1–3 with Pl. 15, figs 1–5). Like
|
||
<emphasis id="B92A0033FFA1FFC66A0DE5E6FDB793F1" box="[328,569,477,503]" italics="true" pageId="14" pageNumber="15">
|
||
<taxonomicName id="4C5EA7A2FFA1FFC66A0DE5E6FDBA93F1" authorityName="Westrop & Eoff" authorityYear="2020" box="[328,564,477,503]" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="14" pageNumber="15" phylum="Arthropoda" rank="species" species="morgancreekensis">B. morgancreekensis</taxonomicName>
|
||
,
|
||
</emphasis>
|
||
<taxonomicName id="4C5EA7A2FFA1FFC66904E5E6FD3593F1" authorityName="Westrop & Eoff" authorityYear="2020" box="[577,699,477,503]" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="14" pageNumber="15" phylum="Arthropoda" rank="species" species="angelae">
|
||
<emphasis id="B92A0033FFA1FFC66904E5E6FDDC93F1" box="[577,594,478,503]" italics="true" pageId="14" pageNumber="15">B</emphasis>
|
||
.
|
||
<emphasis id="B92A0033FFA1FFC66927E5E5FD3593F1" box="[610,699,477,503]" italics="true" pageId="14" pageNumber="15">angelae</emphasis>
|
||
</taxonomicName>
|
||
has a more evenly down-sloping border (Pl. 15, figs 6–9) that is quite different from the topography of the border in
|
||
<taxonomicName id="4C5EA7A2FFA1FFC6699AE63AFCE5901D" authorityName="Rasetti" authorityYear="1946" box="[735,875,513,539]" class="Trilobita" family="Kingstoniidae" genus="Blountia" higherTaxonomySource="GBIF,CoL" kingdom="Animalia" order="Ptychopariida" pageId="14" pageNumber="15" phylum="Arthropoda" rank="species" species="gaspensis">
|
||
<emphasis id="B92A0033FFA1FFC6699AE63AFD7E901D" box="[735,752,514,539]" italics="true" pageId="14" pageNumber="15">B</emphasis>
|
||
.
|
||
<emphasis id="B92A0033FFA1FFC669BBE63AFCE5901D" box="[766,875,514,539]" italics="true" pageId="14" pageNumber="15">gaspensis</emphasis>
|
||
</taxonomicName>
|
||
.
|
||
</paragraph>
|
||
</subSubSection>
|
||
</treatment>
|
||
</document> |