265 lines
39 KiB
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265 lines
39 KiB
XML
<document ID-DOI="10.1098/rsos.210664" ID-GBIF-Dataset="5a8f8839-a6dd-48ce-845d-97253564f5f5" ID-PMC="PMC8424305" ID-PubMed="34527273" ID-Zenodo-Dep="5501429" approvedBy="diego" checkinTime="1631278894277" checkinUser="diego" docAuthor="Caron, J. - B. & Moysiuk, J." docDate="2021" docId="E95253443C28D54CFF4C961EFE79FCF7" docLanguage="en" docName="rsos.210664.pdf" docOrigin="Royal Society Open Science 8 (9)" docSource="http://dx.doi.org/10.1098/rsos.210664" docTitle="Pahvantia hastata" docType="treatment" docVersion="5" lastPageNumber="12" masterDocId="156B2B3C3C21D547FFD89567FFB0FFD0" masterDocTitle="A giant nektobenthic radiodont from the Burgess Shale and the significance of hurdiid carapace diversity" masterLastPageNumber="210664" masterPageNumber="210664" pageNumber="10" updateTime="1668144133123" updateUser="ExternalLinkService" zenodo-license-document="CC-BY-4.0">
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<mods:title>A giant nektobenthic radiodont from the Burgess Shale and the significance of hurdiid carapace diversity</mods:title>
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<mods:namePart>Caron, J. - B.</mods:namePart>
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<mods:namePart>Moysiuk, J.</mods:namePart>
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<mods:date>2021</mods:date>
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<mods:number>2021-09-08</mods:number>
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<treatment ID-DOI="http://doi.org/10.5281/zenodo.5500182" ID-GBIF-Taxon="187726594" ID-Zenodo-Dep="5500182" LSID="urn:lsid:plazi:treatment:E95253443C28D54CFF4C961EFE79FCF7" httpUri="http://treatment.plazi.org/id/E95253443C28D54CFF4C961EFE79FCF7" lastPageId="11" lastPageNumber="12" pageId="9" pageNumber="10">
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<subSubSection box="[148,809,889,922]" pageId="9" pageNumber="10" type="nomenclature">
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<paragraph blockId="9.[148,809,889,922]" box="[148,809,889,922]" pageId="9" pageNumber="10">
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<heading bold="true" box="[148,809,889,922]" fontSize="14" level="2" pageId="9" pageNumber="10" reason="0">
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<emphasis bold="true" box="[148,588,889,922]" pageId="9" pageNumber="10">3.2. Morphological reinterpretation of</emphasis>
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<taxonomicName authority="Lerosey-Aubril & Pates, 2018" box="[601,809,889,922]" class="Dinocaridida" family="Hurdiidae" genus="Pahvantia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="9" pageNumber="10" phylum="Arthropoda" rank="species" species="hastata">
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<emphasis box="[601,809,889,922]" italics="true" pageId="9" pageNumber="10">Pahvantia hastata</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 lastPageId="11" lastPageNumber="12" pageId="9" pageNumber="10" type="discussion">
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<paragraph blockId="9.[148,1244,945,1960]" pageId="9" pageNumber="10">
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Lerosey-Aubril and Pates [
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<bibRefCitation author="Lerosey-Aubril R & Pates S." box="[419,446,945,967]" journalOrPublisher="Nat. Commun." pageId="9" pageNumber="10" pagination="3774" part="9" refId="ref11196" refString="22. Lerosey-Aubril R, Pates S. 2018 New suspension-feeding radiodont suggests evolution of microplanktivory in Cambrian macronekton. Nat. Commun. 9, 3774. (doi: 10. 1038 / s 41467 - 018 - 06229 - 7)" title="New suspension-feeding radiodont suggests evolution of microplanktivory in Cambrian macronekton" type="journal article" year="2018">22</bibRefCitation>
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] recently described a fossil assemblage of
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<taxonomicName box="[878,973,946,967]" class="Dinocaridida" family="Hurdiidae" genus="Pahvantia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="9" pageNumber="10" phylum="Arthropoda" rank="genus">
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<emphasis box="[878,973,946,967]" italics="true" pageId="9" pageNumber="10">Pahvantia</emphasis>
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</taxonomicName>
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(KUMIP 314089) showing a well-preserved tripartite carapace complex, identifying it as a radiodont, as well as what they interpreted as an unusual
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<typeStatus box="[304,350,1010,1031]" pageId="9" pageNumber="10">type</typeStatus>
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of appendage with extremely long setose endites (their
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<figureCitation box="[943,1056,1010,1032]" captionStart="Figure 3" captionStartId="6.[148,206,1530,1554]" captionTargetBox="[155,1236,116,1506]" captionTargetId="figure-1@6.[158,1238,113,1509]" captionTargetPageId="6" captionText="Figure 3. Assemblage of Titanokorys gainesi gen. et sp. nov., holotype ROMIP 65415. (a) Overview of slab, with boxed regions indicating close-ups in other panels, note associated agnostids (Peronopsis cf. columbiensis) possibly feeding on the remains or encrusting biofilms [27]; (b,c) original obliquely preserved H-element, with arrows showing the direction of deformation and dashes indicating sagittal axis of symmetry (b) and hypothetical undeformed version (c) using distort mode in Adobe Photoshop version 21.2.2 (based on the length-width proportions of ROMIP 65168). (d) Close-up of P-element spine; (e) closeup of P-element showing ridges; (f) close-up of bands of gill lamellae; (g,h) appendages and oral cone photographed using different low-angle light orientations to emphasize different details; (i,j) overall view (i) and close-up (j) of the frontal appendage of Cambroraster falcatus, ROMIP 65084, showing comparatively shorter spiniform distal endites and shorter secondary spines on more proximal endites. (k) Line drawing of appendages and oral cone of T. gainesi (from g,h); (l–n) close-ups of frontal appendages using different low-angle light orientations (l, close-up of g; m, close-up of h). Bu; burrow; Gb, gill blade; Ig, individual gill filament; In, Indeterminate; Oc, oral cone; Pc, Peronopsis cf. columbiensis; Pd, peduncle (podomere 1); Pe, P-element; PoX, podomere no. X; Ps, P-element spine; other abbreviations see figures 1 and 2. Scale bars: (a–c) = 50 mm; (e,g–i,k–n) = 10 mm; (d,f,j) = 5 mm." figureDoi="http://doi.org/10.5281/zenodo.5501435" httpUri="https://zenodo.org/record/5501435/files/figure.png" pageId="9" pageNumber="10">
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figure 3
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<emphasis box="[1024,1056,1010,1032]" italics="true" pageId="9" pageNumber="10">a–c</emphasis>
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</figureCitation>
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). This appendage was interpreted as having seven endites divided into two broadly different
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<typeStatus box="[973,1029,1042,1063]" pageId="9" pageNumber="10">types</typeStatus>
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and sizes. The two proximal endites they identified were short with about seven strong auxiliary spines each, with the second endite being about three times wider compared with the first endite. The five distal endites were long—up to four times the size of the proximal endites—and had up to 50–60 setae.
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</paragraph>
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<paragraph blockId="9.[148,1244,945,1960]" pageId="9" pageNumber="10">
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There are a number of issues with the interpretation of the putative appendage in this specimen [
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<bibRefCitation author="Moysiuk J & Caron J-B." box="[1190,1205,1169,1191]" journalOrPublisher="Proc. R. Soc. B" pageId="9" pageNumber="10" pagination="20191079" part="286" refId="ref10285" refString="2. Moysiuk J, Caron J-B. 2019 A new hurdiid radiodont from the Burgess Shale evinces the exploitation of Cambrian infaunal food sources. Proc. R. Soc. B 286, 20191079. (doi: 10.1098 / rspb. 2019. 1079)" title="A new hurdiid radiodont from the Burgess Shale evinces the exploitation of Cambrian infaunal food sources" type="book" year="2019">2</bibRefCitation>
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]. In particular, there is no evidence of podomeres associated with the elongate setose ‘endites’, and these ‘endites’ are irregularly bent, curving to varying degrees along their lengths, suggesting they were highly flexible. Endites are well sclerotized in other hurdiids and are therefore not typically deformed in this way [2,5]. Hurdiid endites generally exhibit a smooth mesial curvature [
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<bibRefCitation author="Moysiuk J & Caron J-B." box="[1040,1055,1297,1319]" journalOrPublisher="Proc. R. Soc. B" pageId="9" pageNumber="10" pagination="20191079" part="286" refId="ref10285" refString="2. Moysiuk J, Caron J-B. 2019 A new hurdiid radiodont from the Burgess Shale evinces the exploitation of Cambrian infaunal food sources. Proc. R. Soc. B 286, 20191079. (doi: 10.1098 / rspb. 2019. 1079)" title="A new hurdiid radiodont from the Burgess Shale evinces the exploitation of Cambrian infaunal food sources" type="book" year="2019">2</bibRefCitation>
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], contrary to the sharp bends seen in the
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<taxonomicName box="[437,534,1330,1351]" class="Dinocaridida" family="Hurdiidae" genus="Pahvantia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="9" pageNumber="10" phylum="Arthropoda" rank="genus">
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<emphasis box="[437,534,1330,1351]" italics="true" pageId="9" pageNumber="10">Pahvantia</emphasis>
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</taxonomicName>
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specimen. In addition, no hurdiid shows endites with clearly differentiated secondary spines and secondary setae in the same appendage. One possible exception is
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<taxonomicName authorityName="Van Roy, Daley & Briggs" authorityYear="2015" box="[148,267,1394,1415]" class="Dinocaridida" family="Hurdiidae" genus="Aegirocassis" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="9" pageNumber="10" phylum="Arthropoda" rank="genus">
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<emphasis box="[148,267,1394,1415]" italics="true" pageId="9" pageNumber="10">Aegirocassis</emphasis>
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</taxonomicName>
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which might have secondary spines on the peduncular endite, but these are not clearly preserved in the figured material (
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<figureCitation box="[521,635,1426,1448]" captionStart="Figure 2" captionStartId="5.[148,206,1372,1396]" captionTargetBox="[173,1228,116,1347]" captionTargetId="figure-172@5.[171,1230,113,1350]" captionTargetPageId="5" captionText="Figure 2. Assemblage of Titanokorys gainesi gen. et sp. nov., paratype ROMIP 65741. (a) Overview of slab, showing close association of H-element and partial appendage with an assemblage of Cambroraster falcatus consisting of an H-element and pair of appendages; (b) detail of T. gainesi; (c) close-up of endites from frontal appendage; (d) close-up of endites from frontal appendage of C. falcatus; (e) close-up of anterior margin of H-element, showing ornamentation. Ap, anterolateral processes; EnX, endite no. X; He, H-element; He-C, H-element of C. falcatus; Fa, frontal appendage; Fa-C, frontal appendage of C. falcatus; Ri, ridges associated with a reticulated pattern; Sa, sagittal spine; Se, secondary spines on endites; Sp, spiniform distal endites; Ts, Terminal spine; Tu, tubercles. Scale bars, (a,b) = 20 mm; (c–e) = 5 mm." figureDoi="http://doi.org/10.5281/zenodo.5501433" httpUri="https://zenodo.org/record/5501433/files/figure.png" pageId="9" pageNumber="10">
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figure 2
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<emphasis box="[607,617,1427,1448]" italics="true" pageId="9" pageNumber="10">a</emphasis>
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,
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<emphasis box="[624,635,1426,1447]" italics="true" pageId="9" pageNumber="10">b</emphasis>
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</figureCitation>
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in [
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<bibRefCitation author="Van Roy P & Daley AC & Briggs DEG." box="[681,695,1425,1448]" journalOrPublisher="Nature" pageId="9" pageNumber="10" pagination="77 - 80" part="522" refId="ref10425" refString="5. Van Roy P, Daley AC, Briggs DEG. 2015 Anomalocaridid trunk limb homology revealed by a giant filter-feeder with paired flaps. Nature 522, 77 - 80. (doi: 10.1038 / nature 14256)" title="Anomalocaridid trunk limb homology revealed by a giant filter-feeder with paired flaps" type="journal article" year="2015">5</bibRefCitation>
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]). Finally, the presence of two rather than a single peduncular endite as well as their small relative size is unprecedented [
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<bibRefCitation author="Pates S & Daley AC & Butterfield NJ" box="[911,940,1457,1479]" journalOrPublisher="Zool. Lett." pageId="9" pageNumber="10" pagination="18" part="5" refId="ref11963" refString="42. Pates S, Daley AC, Butterfield NJ. 2019 First report of paired ventral endites in a hurdiid radiodont. Zool. Lett. 5, 18. (doi: 10.1186 / s 40851 - 019 - 0132 - 4)" title="First report of paired ventral endites in a hurdiid radiodont" type="journal article" year="2019">42</bibRefCitation>
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].
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</paragraph>
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<paragraph blockId="9.[148,1244,945,1960]" lastBlockId="11.[148,1245,114,808]" lastPageId="11" lastPageNumber="12" pageId="9" pageNumber="10">
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As is typical with Burgess Shale-type preservation, KUMIP 314089 is preserved as a part and a counterpart, with the split going through various superimposed layers of the fossilized tissues in such a way that different structures may be visible on each. The part is the best preserved; however, the counterpart shows some remnants of structures missing on the part (
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<figureCitation box="[923,1038,1586,1608]" captionStart="Figure 6" captionStartId="10.[148,206,1509,1533]" captionTargetBox="[173,1228,115,1485]" captionTargetId="figure-63@10.[171,1230,113,1487]" captionTargetPageId="10" captionText="Figure 6. Comparative morphology of Pahvantia hastata. (a–c), P. hastata KUMIP 314089; (a), the part showing distal ends of broken endites to the left of the gill blades; (b) part and counterpart superposed to show the nearly complete appendage partly overlying the gill blades, lower inset showing complete counterpart with carapace elements, upper inset showing a close-up of partial appendage and gills on counterpart; (c) counterpart superposed on line drawing of part; (d) appendage of Hurdia for comparison, ROMIP 59259; (e–h), disarticulated Hurdia assemblages, showing groups of connected gill blades associated with other body parts; (e,f), ROMIP 60031; (g,h), ROMIP 60041. Scale bars: (a–c) = 2 mm; (b); upper inset, 5 mm; lower inset, 10 mm; (d–h) = 10 mm. Ds, dorsal spine; Ot, Ottoia prolifica; PEn, peduncular endite, other abbreviations see figures 1 and 3. (a–c) Images courtesy Rudy Lerosey-Aubril." figureDoi="http://doi.org/10.5281/zenodo.5501441" httpUri="https://zenodo.org/record/5501441/files/figure.png" pageId="9" pageNumber="10">
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figure 6
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<emphasis box="[1011,1022,1586,1607]" italics="true" pageId="9" pageNumber="10">b</emphasis>
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,
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<emphasis box="[1028,1038,1587,1608]" italics="true" pageId="9" pageNumber="10">c</emphasis>
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</figureCitation>
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). When images of both part and counterpart are superposed, the stacked image shows clearly the presence of a distinct appendage,
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<emphasis box="[279,299,1650,1671]" italics="true" pageId="9" pageNumber="10">ca</emphasis>
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<quantity box="[308,380,1650,1671]" metricMagnitude="-2" metricUnit="m" metricValue="1.0" pageId="9" pageNumber="10" unit="mm" value="10.0">10 mm</quantity>
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in height, partly overlapping a larger array of ribbon-like structures (
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<figureCitation box="[1134,1230,1650,1672]" captionStart="Figure 6" captionStartId="10.[148,206,1509,1533]" captionTargetBox="[173,1228,115,1485]" captionTargetId="figure-63@10.[171,1230,113,1487]" captionTargetPageId="10" captionText="Figure 6. Comparative morphology of Pahvantia hastata. (a–c), P. hastata KUMIP 314089; (a), the part showing distal ends of broken endites to the left of the gill blades; (b) part and counterpart superposed to show the nearly complete appendage partly overlying the gill blades, lower inset showing complete counterpart with carapace elements, upper inset showing a close-up of partial appendage and gills on counterpart; (c) counterpart superposed on line drawing of part; (d) appendage of Hurdia for comparison, ROMIP 59259; (e–h), disarticulated Hurdia assemblages, showing groups of connected gill blades associated with other body parts; (e,f), ROMIP 60031; (g,h), ROMIP 60041. Scale bars: (a–c) = 2 mm; (b); upper inset, 5 mm; lower inset, 10 mm; (d–h) = 10 mm. Ds, dorsal spine; Ot, Ottoia prolifica; PEn, peduncular endite, other abbreviations see figures 1 and 3. (a–c) Images courtesy Rudy Lerosey-Aubril." figureDoi="http://doi.org/10.5281/zenodo.5501441" httpUri="https://zenodo.org/record/5501441/files/figure.png" pageId="9" pageNumber="10">
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figure 6
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<emphasis box="[1219,1230,1650,1671]" italics="true" pageId="9" pageNumber="10">b</emphasis>
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</figureCitation>
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). The appendage bears five endites of similar lengths, each probably bearing seven to eight robust, hooked secondary spines and terminating distally in a similar hooked spine. These structures were partially described by Lerosey-Aubril and Pates [
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<bibRefCitation author="Lerosey-Aubril R & Pates S." box="[684,711,1745,1767]" journalOrPublisher="Nat. Commun." pageId="9" pageNumber="10" pagination="3774" part="9" refId="ref11196" refString="22. Lerosey-Aubril R, Pates S. 2018 New suspension-feeding radiodont suggests evolution of microplanktivory in Cambrian macronekton. Nat. Commun. 9, 3774. (doi: 10. 1038 / s 41467 - 018 - 06229 - 7)" title="New suspension-feeding radiodont suggests evolution of microplanktivory in Cambrian macronekton" type="journal article" year="2018">22</bibRefCitation>
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] who interpreted them as two proximal endites, but we consider their ‘second endite’ to actually consist of three partially stacked endites with visible posterior margins. The most distal elongate endite (number six) was overlooked and is mostly preserved on the counterpart (only its tip is visible on the part) together with the dorsal sections of the podomeres, which are not preserved on the part. Asemicircular structure proximal to the enditebearing podomeres can be identified as the peduncle. Triangular projections dorsal and ventral to the peduncle might represent a dorsal spine and the remnants of a peduncular or shaft endite [
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<bibRefCitation author="Pates S & Daley AC & Butterfield NJ" box="[1205,1234,1937,1959]" journalOrPublisher="Zool. Lett." pageId="9" pageNumber="10" pagination="18" part="5" refId="ref11963" refString="42. Pates S, Daley AC, Butterfield NJ. 2019 First report of paired ventral endites in a hurdiid radiodont. Zool. Lett. 5, 18. (doi: 10.1186 / s 40851 - 019 - 0132 - 4)" title="First report of paired ventral endites in a hurdiid radiodont" type="journal article" year="2019">42</bibRefCitation>
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], respectively. Additional possible dorsal spines are present more distally. Overall, the newly recognized appendage is about half the maximum dimension of the structure previously described by Lerosey-Aubril and Pates [
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<bibRefCitation author="Lerosey-Aubril R & Pates S." box="[349,378,1905,1927]" journalOrPublisher="Nat. Commun." pageId="10" pageNumber="11" pagination="3774" part="9" refId="ref11196" refString="22. Lerosey-Aubril R, Pates S. 2018 New suspension-feeding radiodont suggests evolution of microplanktivory in Cambrian macronekton. Nat. Commun. 9, 3774. (doi: 10. 1038 / s 41467 - 018 - 06229 - 7)" title="New suspension-feeding radiodont suggests evolution of microplanktivory in Cambrian macronekton" type="journal article" year="2018">22</bibRefCitation>
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]. The appendage, from the distal tips of its endites to the outer margin of the podomeres, also represents less than one-third of the length of the associated H-element on the same slab, which would make it more consistent with the carapace/appendage size ratio observed in other hurdiid assemblages such as
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<taxonomicName authorityName="Walcott" authorityYear="1912" box="[461,531,146,167]" class="Dinocaridida" family="Hurdiidae" genus="Hurdia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="11" pageNumber="12" phylum="Arthropoda" rank="genus">
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<emphasis box="[461,531,146,167]" italics="true" pageId="11" pageNumber="12">Hurdia</emphasis>
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</taxonomicName>
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[
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<bibRefCitation author="Daley A & Budd G & Caron J-B." box="[545,559,145,167]" journalOrPublisher="J. Syst. Paleontol." pageId="11" pageNumber="12" pagination="743 - 787" part="11" refId="ref10383" refString="4. Daley A, Budd G, Caron J-B. 2013 Morphology and systematics of the anomalocaridid arthropod Hurdia from the Middle Cambrian of British Columbia and Utah. J. Syst. Paleontol. 11, 743 - 787." title="Morphology and systematics of the anomalocaridid arthropod Hurdia from the Middle Cambrian of British Columbia and Utah" type="journal article" year="2013">4</bibRefCitation>
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] and
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<taxonomicName authorityName="Moysiuk & Caron" authorityYear="2019" box="[622,751,146,167]" class="Dinocaridida" family="Hurdiidae" genus="Cambroraster" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="11" pageNumber="12" phylum="Arthropoda" rank="genus">
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<emphasis box="[622,751,146,167]" italics="true" pageId="11" pageNumber="12">Cambroraster</emphasis>
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</taxonomicName>
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[
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<bibRefCitation author="Moysiuk J & Caron J-B." box="[767,782,145,167]" journalOrPublisher="Proc. R. Soc. B" pageId="11" pageNumber="12" pagination="20191079" part="286" refId="ref10285" refString="2. Moysiuk J, Caron J-B. 2019 A new hurdiid radiodont from the Burgess Shale evinces the exploitation of Cambrian infaunal food sources. Proc. R. Soc. B 286, 20191079. (doi: 10.1098 / rspb. 2019. 1079)" title="A new hurdiid radiodont from the Burgess Shale evinces the exploitation of Cambrian infaunal food sources" type="book" year="2019">2</bibRefCitation>
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].
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</paragraph>
|
||
<caption ID-DOI="http://doi.org/10.5281/zenodo.5501441" ID-Zenodo-Dep="5501441" httpUri="https://zenodo.org/record/5501441/files/figure.png" pageId="10" pageNumber="11" startId="10.[148,206,1509,1533]" targetBox="[173,1228,115,1485]" targetPageId="10">
|
||
<paragraph blockId="10.[148,1245,1509,1758]" pageId="10" pageNumber="11">
|
||
<emphasis bold="true" box="[148,474,1509,1534]" pageId="10" pageNumber="11">Figure 6. Comparative morphology of</emphasis>
|
||
<taxonomicName box="[483,633,1510,1534]" class="Dinocaridida" family="Hurdiidae" genus="Pahvantia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="10" pageNumber="11" phylum="Arthropoda" rank="genus">
|
||
<emphasis box="[483,633,1510,1534]" italics="true" pageId="10" pageNumber="11">Pahvantia hastata</emphasis>
|
||
</taxonomicName>
|
||
.
|
||
<emphasis bold="true" box="[647,654,1510,1534]" pageId="10" pageNumber="11">(</emphasis>
|
||
<emphasis box="[653,684,1509,1534]" italics="true" pageId="10" pageNumber="11">a–c</emphasis>
|
||
<emphasis bold="true" box="[684,696,1510,1534]" pageId="10" pageNumber="11">),</emphasis>
|
||
<emphasis box="[705,787,1510,1534]" italics="true" pageId="10" pageNumber="11">P. hastata</emphasis>
|
||
<emphasis bold="true" box="[797,942,1510,1534]" pageId="10" pageNumber="11">KUMIP 314089; (</emphasis>
|
||
<emphasis box="[941,951,1510,1534]" italics="true" pageId="10" pageNumber="11">a</emphasis>
|
||
<emphasis bold="true" pageId="10" pageNumber="11">), the part showing distal ends of broken endites to the left of the gill blades; (</emphasis>
|
||
<emphasis box="[564,574,1542,1566]" italics="true" pageId="10" pageNumber="11">b</emphasis>
|
||
<emphasis bold="true" pageId="10" pageNumber="11">) part and counterpart superposed to show the nearly complete appendage partly overlying the gill blades, lower inset showing complete counterpart with carapace elements, upper inset showing a close-up of partial appendage and gills on counterpart; (</emphasis>
|
||
<emphasis box="[643,650,1606,1630]" italics="true" pageId="10" pageNumber="11">c</emphasis>
|
||
<emphasis bold="true" box="[650,1099,1606,1630]" pageId="10" pageNumber="11">) counterpart superposed on line drawing of part; (</emphasis>
|
||
<emphasis box="[1099,1109,1606,1630]" italics="true" pageId="10" pageNumber="11">d</emphasis>
|
||
<emphasis bold="true" box="[1111,1244,1606,1630]" pageId="10" pageNumber="11">) appendage of</emphasis>
|
||
<taxonomicName authorityName="Walcott" authorityYear="1912" box="[148,202,1638,1662]" class="Dinocaridida" family="Hurdiidae" genus="Hurdia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="10" pageNumber="11" phylum="Arthropoda" rank="genus">
|
||
<emphasis box="[148,202,1638,1662]" italics="true" pageId="10" pageNumber="11">Hurdia</emphasis>
|
||
</taxonomicName>
|
||
<emphasis bold="true" box="[215,506,1638,1662]" pageId="10" pageNumber="11">for comparison, ROMIP 59259; (</emphasis>
|
||
<emphasis box="[505,538,1637,1662]" italics="true" pageId="10" pageNumber="11">e–h</emphasis>
|
||
<emphasis bold="true" box="[538,672,1638,1662]" pageId="10" pageNumber="11">), disarticulated</emphasis>
|
||
<taxonomicName authorityName="Walcott" authorityYear="1912" box="[686,740,1638,1662]" class="Dinocaridida" family="Hurdiidae" genus="Hurdia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="10" pageNumber="11" phylum="Arthropoda" rank="genus">
|
||
<emphasis box="[686,740,1638,1662]" italics="true" pageId="10" pageNumber="11">Hurdia</emphasis>
|
||
</taxonomicName>
|
||
<emphasis bold="true" pageId="10" pageNumber="11">assemblages, showing groups of connected gill blades associated with other body parts; (</emphasis>
|
||
<emphasis box="[451,460,1670,1694]" italics="true" pageId="10" pageNumber="11">e</emphasis>
|
||
,
|
||
<emphasis box="[465,471,1670,1694]" italics="true" pageId="10" pageNumber="11">f</emphasis>
|
||
<emphasis bold="true" box="[475,631,1670,1694]" pageId="10" pageNumber="11">), ROMIP 60031; (</emphasis>
|
||
<emphasis box="[632,642,1670,1694]" italics="true" pageId="10" pageNumber="11">g</emphasis>
|
||
,
|
||
<emphasis box="[647,657,1670,1694]" italics="true" pageId="10" pageNumber="11">h</emphasis>
|
||
<emphasis bold="true" box="[658,913,1670,1694]" pageId="10" pageNumber="11">), ROMIP 60041. Scale bars: (</emphasis>
|
||
<emphasis box="[913,943,1669,1694]" italics="true" pageId="10" pageNumber="11">a–c</emphasis>
|
||
<emphasis bold="true" box="[944,1048,1670,1694]" pageId="10" pageNumber="11">) = 2 mm; (</emphasis>
|
||
<emphasis box="[1048,1058,1670,1694]" italics="true" pageId="10" pageNumber="11">b</emphasis>
|
||
<emphasis bold="true" pageId="10" pageNumber="11">); upper inset, 5 mm; lower inset, 10 mm; (</emphasis>
|
||
<emphasis box="[345,378,1701,1726]" italics="true" pageId="10" pageNumber="11">d–h</emphasis>
|
||
<emphasis bold="true" box="[378,670,1702,1726]" pageId="10" pageNumber="11">) = 10 mm. Ds, dorsal spine; Ot,</emphasis>
|
||
<emphasis box="[682,806,1702,1726]" italics="true" pageId="10" pageNumber="11">
|
||
<taxonomicName authorityName="Walcott" authorityYear="1911" box="[682,731,1702,1726]" class="Palaeoscolecida" family="Ottoiidae" genus="Ottoia" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="10" pageNumber="11" phylum="Priapula" rank="genus">Ottoia</taxonomicName>
|
||
prolifica
|
||
</emphasis>
|
||
;
|
||
<emphasis bold="true" pageId="10" pageNumber="11">PEn, peduncular endite, other abbreviations see figures 1 and 3. (</emphasis>
|
||
<emphasis box="[300,331,1733,1758]" italics="true" pageId="10" pageNumber="11">a–c</emphasis>
|
||
) Images courtesy Rudy Lerosey-Aubril.
|
||
</paragraph>
|
||
</caption>
|
||
<paragraph blockId="11.[148,1245,114,808]" pageId="11" pageNumber="12">
|
||
The putative setose endites described by Lerosey-Aubril and Pates [
|
||
<bibRefCitation author="Lerosey-Aubril R & Pates S." box="[937,964,177,199]" journalOrPublisher="Nat. Commun." pageId="11" pageNumber="12" pagination="3774" part="9" refId="ref11196" refString="22. Lerosey-Aubril R, Pates S. 2018 New suspension-feeding radiodont suggests evolution of microplanktivory in Cambrian macronekton. Nat. Commun. 9, 3774. (doi: 10. 1038 / s 41467 - 018 - 06229 - 7)" title="New suspension-feeding radiodont suggests evolution of microplanktivory in Cambrian macronekton" type="journal article" year="2018">22</bibRefCitation>
|
||
] are more comparable to structures interpreted as gill blades, associated with flaps or body segments in anomalocaridids and hurdiids [4,12,15] including
|
||
<taxonomicName authorityName="Walcott" authorityYear="1912" box="[456,526,242,263]" class="Dinocaridida" family="Hurdiidae" genus="Hurdia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="11" pageNumber="12" phylum="Arthropoda" rank="genus">
|
||
<emphasis box="[456,526,242,263]" italics="true" pageId="11" pageNumber="12">Hurdia</emphasis>
|
||
</taxonomicName>
|
||
(
|
||
<figureCitation box="[544,664,242,264]" captionStart="Figure 6" captionStartId="10.[148,206,1509,1533]" captionTargetBox="[173,1228,115,1485]" captionTargetId="figure-63@10.[171,1230,113,1487]" captionTargetPageId="10" captionText="Figure 6. Comparative morphology of Pahvantia hastata. (a–c), P. hastata KUMIP 314089; (a), the part showing distal ends of broken endites to the left of the gill blades; (b) part and counterpart superposed to show the nearly complete appendage partly overlying the gill blades, lower inset showing complete counterpart with carapace elements, upper inset showing a close-up of partial appendage and gills on counterpart; (c) counterpart superposed on line drawing of part; (d) appendage of Hurdia for comparison, ROMIP 59259; (e–h), disarticulated Hurdia assemblages, showing groups of connected gill blades associated with other body parts; (e,f), ROMIP 60031; (g,h), ROMIP 60041. Scale bars: (a–c) = 2 mm; (b); upper inset, 5 mm; lower inset, 10 mm; (d–h) = 10 mm. Ds, dorsal spine; Ot, Ottoia prolifica; PEn, peduncular endite, other abbreviations see figures 1 and 3. (a–c) Images courtesy Rudy Lerosey-Aubril." figureDoi="http://doi.org/10.5281/zenodo.5501441" httpUri="https://zenodo.org/record/5501441/files/figure.png" pageId="11" pageNumber="12">
|
||
figure 6
|
||
<emphasis box="[630,664,242,264]" italics="true" pageId="11" pageNumber="12">e–h</emphasis>
|
||
</figureCitation>
|
||
). These bands of lamellate structures are not part of an appendage, nor are they likely to have been used for feeding (contra [
|
||
<bibRefCitation author="Lerosey-Aubril R & Pates S." box="[961,990,273,296]" journalOrPublisher="Nat. Commun." pageId="11" pageNumber="12" pagination="3774" part="9" refId="ref11196" refString="22. Lerosey-Aubril R, Pates S. 2018 New suspension-feeding radiodont suggests evolution of microplanktivory in Cambrian macronekton. Nat. Commun. 9, 3774. (doi: 10. 1038 / s 41467 - 018 - 06229 - 7)" title="New suspension-feeding radiodont suggests evolution of microplanktivory in Cambrian macronekton" type="journal article" year="2018">22</bibRefCitation>
|
||
]), probably functioning instead for respiration [
|
||
<bibRefCitation author="Whittington HB & Briggs DEG." box="[405,433,305,327]" journalOrPublisher="Phil. Trans. R. Soc. Lond. B" pageId="11" pageNumber="12" pagination="569 - 609" part="309" refId="ref10828" refString="15. Whittington HB, Briggs DEG. 1985 The largest Cambrian animal, Anomalocaris, Burgess Shale, British Columbia. Phil. Trans. R. Soc. Lond. B 309, 569 - 609. (doi: 10.1098 / rstb. 1985.0096)" title="The largest Cambrian animal, Anomalocaris, Burgess Shale, British Columbia" type="journal article" year="1985">15</bibRefCitation>
|
||
]. In
|
||
<taxonomicName authorityName="Walcott" authorityYear="1912" box="[486,556,306,327]" class="Dinocaridida" family="Hurdiidae" genus="Hurdia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="11" pageNumber="12" phylum="Arthropoda" rank="genus">
|
||
<emphasis box="[486,556,306,327]" italics="true" pageId="11" pageNumber="12">Hurdia</emphasis>
|
||
</taxonomicName>
|
||
, the gill blades are prominent ventrolaterally and can be very elongate as demonstrated in disarticulated or isolated material [
|
||
<bibRefCitation author="Daley A & Budd G & Caron J-B." box="[836,852,337,359]" journalOrPublisher="J. Syst. Paleontol." pageId="11" pageNumber="12" pagination="743 - 787" part="11" refId="ref10383" refString="4. Daley A, Budd G, Caron J-B. 2013 Morphology and systematics of the anomalocaridid arthropod Hurdia from the Middle Cambrian of British Columbia and Utah. J. Syst. Paleontol. 11, 743 - 787." title="Morphology and systematics of the anomalocaridid arthropod Hurdia from the Middle Cambrian of British Columbia and Utah" type="journal article" year="2013">4</bibRefCitation>
|
||
]. Stacks of
|
||
<taxonomicName authorityName="Walcott" authorityYear="1912" box="[976,1046,338,359]" class="Dinocaridida" family="Hurdiidae" genus="Hurdia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="11" pageNumber="12" phylum="Arthropoda" rank="genus">
|
||
<emphasis box="[976,1046,338,359]" italics="true" pageId="11" pageNumber="12">Hurdia</emphasis>
|
||
</taxonomicName>
|
||
gill blades can be preserved in similar ways to those observed in the
|
||
<taxonomicName box="[737,834,370,391]" class="Dinocaridida" family="Hurdiidae" genus="Pahvantia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="11" pageNumber="12" phylum="Arthropoda" rank="genus">
|
||
<emphasis box="[737,834,370,391]" italics="true" pageId="11" pageNumber="12">Pahvantia</emphasis>
|
||
</taxonomicName>
|
||
material, especially in disarticulated carcasses or moult assemblages (
|
||
<figureCitation box="[517,608,402,424]" captionStart="Figure 6" captionStartId="10.[148,206,1509,1533]" captionTargetBox="[173,1228,115,1485]" captionTargetId="figure-63@10.[171,1230,113,1487]" captionTargetPageId="10" captionText="Figure 6. Comparative morphology of Pahvantia hastata. (a–c), P. hastata KUMIP 314089; (a), the part showing distal ends of broken endites to the left of the gill blades; (b) part and counterpart superposed to show the nearly complete appendage partly overlying the gill blades, lower inset showing complete counterpart with carapace elements, upper inset showing a close-up of partial appendage and gills on counterpart; (c) counterpart superposed on line drawing of part; (d) appendage of Hurdia for comparison, ROMIP 59259; (e–h), disarticulated Hurdia assemblages, showing groups of connected gill blades associated with other body parts; (e,f), ROMIP 60031; (g,h), ROMIP 60041. Scale bars: (a–c) = 2 mm; (b); upper inset, 5 mm; lower inset, 10 mm; (d–h) = 10 mm. Ds, dorsal spine; Ot, Ottoia prolifica; PEn, peduncular endite, other abbreviations see figures 1 and 3. (a–c) Images courtesy Rudy Lerosey-Aubril." figureDoi="http://doi.org/10.5281/zenodo.5501441" httpUri="https://zenodo.org/record/5501441/files/figure.png" pageId="11" pageNumber="12">figure 6</figureCitation>
|
||
). In addition, the number of individual elements in the bands in
|
||
<taxonomicName box="[251,348,434,455]" class="Dinocaridida" family="Hurdiidae" genus="Pahvantia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="11" pageNumber="12" phylum="Arthropoda" rank="genus">
|
||
<emphasis box="[251,348,434,455]" italics="true" pageId="11" pageNumber="12">Pahvantia</emphasis>
|
||
</taxonomicName>
|
||
is roughly similar to what is known in the gills of
|
||
<taxonomicName authorityName="Walcott" authorityYear="1912" box="[918,988,434,455]" class="Dinocaridida" family="Hurdiidae" genus="Hurdia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="11" pageNumber="12" phylum="Arthropoda" rank="genus">
|
||
<emphasis box="[918,988,434,455]" italics="true" pageId="11" pageNumber="12">Hurdia</emphasis>
|
||
</taxonomicName>
|
||
[
|
||
<bibRefCitation author="Daley A & Budd G & Caron J-B." box="[1004,1018,433,455]" journalOrPublisher="J. Syst. Paleontol." pageId="11" pageNumber="12" pagination="743 - 787" part="11" refId="ref10383" refString="4. Daley A, Budd G, Caron J-B. 2013 Morphology and systematics of the anomalocaridid arthropod Hurdia from the Middle Cambrian of British Columbia and Utah. J. Syst. Paleontol. 11, 743 - 787." title="Morphology and systematics of the anomalocaridid arthropod Hurdia from the Middle Cambrian of British Columbia and Utah" type="journal article" year="2013">4</bibRefCitation>
|
||
] suggesting they are equivalent structures. The amorphous strand of material overlapping and extending beyond the margin of the appendage peduncle, originally interpreted as a part of the appendage, is more likely associated with the mass of gills and trunk cuticle.
|
||
</paragraph>
|
||
<paragraph blockId="11.[148,1245,114,808]" pageId="11" pageNumber="12">
|
||
In conclusion, a re-evaluation of KUMIP 314089 based on the photographic material provided by the authors, leads us to demonstrate the presence of a nearly complete and partially unnoticed appendage. This appendage has the greatest similarity in morphology, particularly in terms of the number and form of the secondary spines, to
|
||
<taxonomicName authorityName="Walcott" authorityYear="1912" box="[438,508,658,679]" class="Dinocaridida" family="Hurdiidae" genus="Hurdia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="11" pageNumber="12" phylum="Arthropoda" rank="genus">
|
||
<emphasis box="[438,508,658,679]" italics="true" pageId="11" pageNumber="12">Hurdia</emphasis>
|
||
</taxonomicName>
|
||
[2,4], suggesting an adaptation for capturing larger prey living along or in the sediment and thus probably a nektobenthic lifestyle, contra [
|
||
<bibRefCitation author="Lerosey-Aubril R & Pates S." box="[883,912,689,711]" journalOrPublisher="Nat. Commun." pageId="11" pageNumber="12" pagination="3774" part="9" refId="ref11196" refString="22. Lerosey-Aubril R, Pates S. 2018 New suspension-feeding radiodont suggests evolution of microplanktivory in Cambrian macronekton. Nat. Commun. 9, 3774. (doi: 10. 1038 / s 41467 - 018 - 06229 - 7)" title="New suspension-feeding radiodont suggests evolution of microplanktivory in Cambrian macronekton" type="journal article" year="2018">22</bibRefCitation>
|
||
]. However, the subequal length of the five elongate endites as well as the shape of the H- and P-elements sets
|
||
<taxonomicName box="[1021,1118,722,743]" class="Dinocaridida" family="Hurdiidae" genus="Pahvantia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="11" pageNumber="12" phylum="Arthropoda" rank="genus">
|
||
<emphasis box="[1021,1118,722,743]" italics="true" pageId="11" pageNumber="12">Pahvantia</emphasis>
|
||
</taxonomicName>
|
||
apart from
|
||
<taxonomicName authorityName="Walcott" authorityYear="1912" box="[148,218,754,775]" class="Dinocaridida" family="Hurdiidae" genus="Hurdia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="11" pageNumber="12" phylum="Arthropoda" rank="genus">
|
||
<emphasis box="[148,218,754,775]" italics="true" pageId="11" pageNumber="12">Hurdia</emphasis>
|
||
</taxonomicName>
|
||
. Together with our phylogenetic results (see below), these differences justify the retention of
|
||
<taxonomicName box="[148,245,786,807]" class="Dinocaridida" family="Hurdiidae" genus="Pahvantia" higherTaxonomySource="GBIF" kingdom="Animalia" order="Radiodonta" pageId="11" pageNumber="12" phylum="Arthropoda" rank="genus">
|
||
<emphasis box="[148,245,786,807]" italics="true" pageId="11" pageNumber="12">Pahvantia</emphasis>
|
||
</taxonomicName>
|
||
as a distinct genus.
|
||
</paragraph>
|
||
</subSubSection>
|
||
</treatment>
|
||
</subSection>
|
||
</document> |