197 lines
25 KiB
XML
197 lines
25 KiB
XML
<document id="6A11BB5E1F65C1A652EE827364BE85AC" ID-CLB-Dataset="277861" ID-DOI="10.11646/zootaxa.5361.3.8" ID-GBIF-Dataset="9df305b3-e87a-49e0-bc8a-b29ab69e66ad" ID-ISSN="1175-5326" ID-Zenodo-Dep="10151183" ID-ZooBank="E03BB30C-E092-4293-8ECE-CE2F402D3083" IM.bibliography_approvedBy="felipe" IM.illustrations_approvedBy="felipe" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.tables_approvedBy="felipe" IM.taxonomicNames_approvedBy="felipe" IM.treatments_approvedBy="felipe" checkinTime="1700253923963" checkinUser="plazi" docAuthor="Oviedo, Loreley & Pastorino, Guido" docDate="2023" docId="03ED1D20FF8DFFCF439DF90B2433A5B0" docLanguage="en" docName="zootaxa.5361.3.8.pdf" docOrigin="Zootaxa 5361 (3)" docSource="https://www.mapress.com/zt/article/download/zootaxa.5361.3.8/52200" docStyle="DocumentStyle:647186512141C8FC8976D5BCC54AEB7D.15:Zootaxa.2013-.journal_article" docStyleId="647186512141C8FC8976D5BCC54AEB7D" docStyleName="Zootaxa.2013-.journal_article" docStyleVersion="15" docTitle="Zygochlamys patagonica" docType="treatment" docVersion="1" lastPageNumber="438" masterDocId="FFD46558FF85FFC4430AFFE6204DA67A" masterDocTitle="Description of the early shell morphology of three species of Pectinidae (Mollusca: Bivalvia) from Argentina" masterLastPageNumber="443" masterPageNumber="427" pageNumber="435" updateTime="1700610998085" updateUser="felipe" zenodo-license-document="CLOSED">
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<mods:titleInfo id="1D463A50011620621DE08E355B3AB304">
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<mods:title id="07F53661803B93757EDB612A0DFB8EF0">Description of the early shell morphology of three species of Pectinidae (Mollusca: Bivalvia) from Argentina</mods:title>
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<mods:namePart id="23ACD7CF6C0C79F6CC4B0F68A08179A2">Oviedo, Loreley</mods:namePart>
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<mods:nameIdentifier id="E1A24BFE9828A6C16C6D5C2762CAA5FB" type="email">jgloreley@gmail.com</mods:nameIdentifier>
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<mods:namePart id="177E805067CCEF9B9A904CF4B7262924">Pastorino, Guido</mods:namePart>
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<mods:nameIdentifier id="7D2DB4999976BE30DADE5CFEC644AA1D" type="ORCID">0000-0003-3341-777X</mods:nameIdentifier>
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<mods:nameIdentifier id="9C31F2E9BA24A1D95603CA78A01CAD6C" type="email">gpastorino@macn.gov.ar</mods:nameIdentifier>
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<mods:typeOfResource id="2AEBCED5714E32A613F6857CF31C5959">text</mods:typeOfResource>
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<mods:title id="0F25E7CE6AB7518322AE8F5EBC7B5BDB">Zootaxa</mods:title>
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<mods:part id="073F0ECB26A1ED9A30DD468C75E02D9F">
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<mods:date id="48120E7055196E48D4C8A943D5DEF113">2023</mods:date>
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<mods:number id="021489239090AB91D579E8780B53C170">2023-11-02</mods:number>
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<mods:number id="F0B0330A090EF6C57293CED6AA9DC408">5361</mods:number>
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<mods:number id="A2A9D44BC8BB07DD477E00072FE303FD">3</mods:number>
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<mods:start id="439D4E81DF1B5EE0616E12061AA43FAA">427</mods:start>
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<mods:identifier id="788008673155BD4516EB5861287B1976" type="CLB-Dataset">277861</mods:identifier>
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<mods:identifier id="FE7239976560DB9F1D76DFA625FB3679" type="DOI">10.11646/zootaxa.5361.3.8</mods:identifier>
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<treatment id="03ED1D20FF8DFFCF439DF90B2433A5B0" ID-GBIF-Taxon="217742963" LSID="urn:lsid:plazi:treatment:03ED1D20FF8DFFCF439DF90B2433A5B0" httpUri="http://treatment.plazi.org/id/03ED1D20FF8DFFCF439DF90B2433A5B0" lastPageId="11" lastPageNumber="438" pageId="8" pageNumber="435">
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<subSubSection id="C35EFFBDFF8DFFCC439DF90B222BA17D" box="[151,614,1773,1800]" pageId="8" pageNumber="435" type="nomenclature">
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<paragraph id="8BFBAC36FF8DFFCC439DF90B222BA17D" blockId="8.[151,614,1773,1835]" box="[151,614,1773,1800]" pageId="8" pageNumber="435">
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<heading id="D0B31B5AFF8DFFCC439DF90B222BA17D" bold="true" box="[151,614,1773,1800]" fontSize="11" level="1" pageId="8" pageNumber="435" reason="1">
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<taxonomicName id="4C44D7B5FF8DFFCC439DF90B222BA17D" ID-CoL="7GGX7" authority="(King, 1832)" baseAuthorityName="King" baseAuthorityYear="1832" box="[151,614,1773,1800]" class="Bivalvia" family="Pectinidae" genus="Zygochlamys" kingdom="Animalia" order="Pectinida" pageId="8" pageNumber="435" phylum="Mollusca" rank="species" species="patagonica">
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<emphasis id="B9307024FF8DFFCC439DF90B222BA17D" bold="true" box="[151,614,1773,1800]" pageId="8" pageNumber="435">
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<emphasis id="B9307024FF8DFFCC439DF90B2189A17D" bold="true" box="[151,452,1773,1800]" italics="true" pageId="8" pageNumber="435">Zygochlamys patagonica</emphasis>
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(
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<bibRefCitation id="EFD5D1C7FF8DFFCC42D9F90B2213A17D" author="King, P. P." box="[467,606,1773,1799]" pageId="8" pageNumber="435" pagination="332 - 349" refId="ref8812" refString="King, P. P. (1832) Description of the Cirripedia, Conchifera and Mollusca in a collection formed by the officers of HMS Adventure and Beagle employed between the years 1826 and 1830 in surveying the southern coasts of South America, including the straits of Magalhaens and the coast of Tierra del Fuego. Zoological Journal, 5, 332 - 349." type="journal article" year="1832">King, 1832</bibRefCitation>
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)
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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="C35EFFBDFF8DFFCC439DF8F720B8A151" box="[151,245,1809,1835]" pageId="8" pageNumber="435" type="description">
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<paragraph id="8BFBAC36FF8DFFCC439DF8F720B8A151" blockId="8.[151,614,1773,1835]" box="[151,245,1809,1835]" pageId="8" pageNumber="435">
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<figureCitation id="137FB0B3FF8DFFCC439DF8F720B8A151" box="[151,245,1809,1835]" captionStart="FIGURE 4" captionStartId="10.[152,255,1908,1932]" captionTargetBox="[211,1376,181,1884]" captionTargetId="figure-22@10.[211,1376,181,1884]" captionTargetPageId="10" captionText="FIGURE 4. Zygochlamys patagonica. A. Left valve. B. Right valve. C. Post-nepioconch of LV. D. Anterior auricle and byssal notch. E. Microsculpture of Nepioconch of LV. F. Prodissoconch. Scale bars: A= 500 µm; B= 500 µm; C= 200 µm; D= 200 µm; E=100 µm; F=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4086)." figureDoi="http://doi.org/10.5281/zenodo.10151193" httpUri="https://zenodo.org/record/10151193/files/figure.png" pageId="8" pageNumber="435">Figure 4</figureCitation>
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</paragraph>
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</subSubSection>
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<subSubSection id="C35EFFBDFF8DFFCF439DF8B42433A5B0" lastPageId="11" lastPageNumber="438" pageId="8" pageNumber="435" type="discussion">
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<paragraph id="8BFBAC36FF8DFFCC439DF8B42106A116" blockId="8.[151,331,1874,1900]" box="[151,331,1874,1900]" pageId="8" pageNumber="435">
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<heading id="D0B31B5AFF8DFFCC439DF8B42106A116" bold="true" box="[151,331,1874,1900]" fontSize="11" level="1" pageId="8" pageNumber="435" reason="1">
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<emphasis id="B9307024FF8DFFCC439DF8B42106A116" bold="true" box="[151,331,1874,1900]" pageId="8" pageNumber="435">Prodissoconch</emphasis>
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</heading>
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</paragraph>
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<paragraph id="8BFBAC36FF8DFFCC439DF87323DFA18C" blockId="8.[151,1436,1940,2039]" pageId="8" pageNumber="435">
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In the single specimen examined by scanning electron microscopy, the microsculpture of the P-1 could not be determined. Prodissoconch-2 presents commarginal growth lines (
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<figureCitation id="137FB0B3FF8DFFCC4089F85E2397A1A8" box="[899,986,1976,2002]" captionStart="FIGURE 4" captionStartId="10.[152,255,1908,1932]" captionTargetBox="[211,1376,181,1884]" captionTargetId="figure-22@10.[211,1376,181,1884]" captionTargetPageId="10" captionText="FIGURE 4. Zygochlamys patagonica. A. Left valve. B. Right valve. C. Post-nepioconch of LV. D. Anterior auricle and byssal notch. E. Microsculpture of Nepioconch of LV. F. Prodissoconch. Scale bars: A= 500 µm; B= 500 µm; C= 200 µm; D= 200 µm; E=100 µm; F=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4086)." figureDoi="http://doi.org/10.5281/zenodo.10151193" httpUri="https://zenodo.org/record/10151193/files/figure.png" pageId="8" pageNumber="435">Fig. 4F</figureCitation>
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). The lengths of P-1 and P-2 are 86 µm and 256 µm, respectively (n = 1), the P-1/P-2 ratio is 0.33 (
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<tableCitation id="C6C6998DFF8DFFCC4027F83A23C9A18C" box="[813,900,2012,2038]" captionStart="TABLE 3" captionStartId="6.[152,245,151,175]" captionTargetBox="[163,1292,228,976]" captionTargetPageId="6" captionText="TABLE 3. Measurements of prodissoconch-1 (P-1) and prodissoconch-2 (P-2) (in µm) and P-1/P-2 ratio of Aequipecten tehuelchus, Flexopecten felipponei and Zygochlamys patagonica." pageId="8" pageNumber="435">Table 3</tableCitation>
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).
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</paragraph>
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<caption id="DF3BFCBEFF8CFFCD4392F8922102A183" ID-DOI="http://doi.org/10.5281/zenodo.10151191" ID-Zenodo-Dep="10151191" httpUri="https://zenodo.org/record/10151191/files/figure.png" pageId="9" pageNumber="436" startId="9.[152,255,1908,1932]" targetBox="[188,1398,181,1884]" targetPageId="9" targetType="figure">
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<paragraph id="8BFBAC36FF8CFFCD4392F8922102A183" blockId="9.[151,1436,1908,2041]" pageId="9" pageNumber="436">
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<emphasis id="B9307024FF8CFFCD4392F892215FA1F6" bold="true" box="[152,274,1908,1932]" pageId="9" pageNumber="436">FIGURE 3</emphasis>
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.
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<taxonomicName id="4C44D7B5FF8CFFCD4214F8922248A1F6" baseAuthorityName="Dall" baseAuthorityYear="1922" box="[286,517,1908,1932]" class="Bivalvia" family="Pectinidae" genus="Flexopecten" kingdom="Animalia" order="Pectinida" pageId="9" pageNumber="436" phylum="Mollusca" rank="species" species="felipponei">
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<emphasis id="B9307024FF8CFFCD4214F8922248A1F6" box="[286,517,1908,1932]" italics="true" pageId="9" pageNumber="436">Flexopecten felipponei</emphasis>
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</taxonomicName>
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.
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<emphasis id="B9307024FF8CFFCD411BF892226EA1F6" bold="true" box="[529,547,1908,1932]" pageId="9" pageNumber="436">A</emphasis>
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. Left valve.
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<emphasis id="B9307024FF8CFFCD41A9F89322F9A1F7" bold="true" box="[675,692,1909,1933]" pageId="9" pageNumber="436">B</emphasis>
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. Right valve.
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<emphasis id="B9307024FF8CFFCD404BF892231EA1F6" bold="true" box="[833,851,1908,1932]" pageId="9" pageNumber="436">C</emphasis>
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. Fold of Post-nepioconch of LV stage.
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<emphasis id="B9307024FF8CFFCD47D4F89324BDA1F7" bold="true" box="[1246,1264,1909,1933]" pageId="9" pageNumber="436">D</emphasis>
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. Anterior auricle and byssal notch.
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<emphasis id="B9307024FF8CFFCD4247F87F2129A1CB" bold="true" box="[333,356,1945,1969]" pageId="9" pageNumber="436">E.</emphasis>
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Microsculpture of LV Nepioconch.
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<emphasis id="B9307024FF8CFFCD41DEF87F22AAA1CB" bold="true" box="[724,743,1945,1969]" pageId="9" pageNumber="436">F.</emphasis>
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Prodissoconch of RV. Scale bars:
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<emphasis id="B9307024FF8CFFCD4749F87E2418A1CA" bold="true" box="[1091,1109,1944,1968]" pageId="9" pageNumber="436">A</emphasis>
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= 1 mm;
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<emphasis id="B9307024FF8CFFCD47B8F87F248EA1CB" bold="true" box="[1202,1219,1945,1969]" pageId="9" pageNumber="436">B</emphasis>
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= 1 mm;
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<emphasis id="B9307024FF8CFFCD4615F87E257CA1CA" bold="true" box="[1311,1329,1944,1968]" pageId="9" pageNumber="436">C</emphasis>
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= 200 µm;
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<emphasis id="B9307024FF8CFFCD439DF85B20E4A1AF" bold="true" box="[151,169,1981,2005]" pageId="9" pageNumber="436">D</emphasis>
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= 400 µm;
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<emphasis id="B9307024FF8CFFCD4212F85B2164A1AF" bold="true" box="[280,297,1981,2005]" pageId="9" pageNumber="436">E</emphasis>
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= 80 µm;
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<emphasis id="B9307024FF8CFFCD429AF85B21D2A1AF" bold="true" box="[400,415,1981,2005]" pageId="9" pageNumber="436">F</emphasis>
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=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4084).
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</paragraph>
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</caption>
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<caption id="DF3BFCBEFF8FFFCE4392F8922094A182" ID-DOI="http://doi.org/10.5281/zenodo.10151193" ID-Zenodo-Dep="10151193" httpUri="https://zenodo.org/record/10151193/files/figure.png" pageId="10" pageNumber="437" startId="10.[152,255,1908,1932]" targetBox="[211,1376,181,1884]" targetPageId="10" targetType="figure">
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<paragraph id="8BFBAC36FF8FFFCE4392F8922094A182" blockId="10.[151,1436,1908,2040]" pageId="10" pageNumber="437">
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<emphasis id="B9307024FF8FFFCE4392F892215FA1F6" bold="true" box="[152,274,1908,1932]" pageId="10" pageNumber="437">FIGURE 4</emphasis>
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.
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<taxonomicName id="4C44D7B5FF8FFFCE4215F8922251A1F6" box="[287,540,1908,1932]" class="Bivalvia" family="Pectinidae" genus="Zygochlamys" kingdom="Animalia" order="Pectinida" pageId="10" pageNumber="437" phylum="Mollusca" rank="species" species="patagonica">
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<emphasis id="B9307024FF8FFFCE4215F8922251A1F6" box="[287,540,1908,1932]" italics="true" pageId="10" pageNumber="437">Zygochlamys patagonica</emphasis>
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</taxonomicName>
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.
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<emphasis id="B9307024FF8FFFCE4123F8922276A1F6" bold="true" box="[553,571,1908,1932]" pageId="10" pageNumber="437">A</emphasis>
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. Left valve.
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<emphasis id="B9307024FF8FFFCE41B6F893229EA1F7" bold="true" box="[700,723,1909,1933]" pageId="10" pageNumber="437">B.</emphasis>
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Right valve.
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<emphasis id="B9307024FF8FFFCE4051F8922339A1F6" bold="true" box="[859,884,1908,1932]" pageId="10" pageNumber="437">C.</emphasis>
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Post-nepioconch of LV.
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<emphasis id="B9307024FF8FFFCE4767F8932432A1F7" bold="true" box="[1133,1151,1909,1933]" pageId="10" pageNumber="437">D</emphasis>
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. Anterior auricle and byssal notch.
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<emphasis id="B9307024FF8FFFCE43D1F87F20A1A1CB" bold="true" box="[219,236,1945,1969]" pageId="10" pageNumber="437">E</emphasis>
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. Microsculpture of Nepioconch of LV.
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<emphasis id="B9307024FF8FFFCE417FF87F22C9A1CB" bold="true" box="[629,644,1945,1969]" pageId="10" pageNumber="437">F</emphasis>
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. Prodissoconch. Scale bars:
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<emphasis id="B9307024FF8FFFCE40A8F87E23F9A1CA" bold="true" box="[930,948,1944,1968]" pageId="10" pageNumber="437">A</emphasis>
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= 500 µm;
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<emphasis id="B9307024FF8FFFCE4729F87F2479A1CB" bold="true" box="[1059,1076,1945,1969]" pageId="10" pageNumber="437">B</emphasis>
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= 500 µm;
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<emphasis id="B9307024FF8FFFCE47ABF87E24FEA1CA" bold="true" box="[1185,1203,1944,1968]" pageId="10" pageNumber="437">C</emphasis>
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= 200 µm;
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<emphasis id="B9307024FF8FFFCE462BF87F257EA1CB" bold="true" box="[1313,1331,1945,1969]" pageId="10" pageNumber="437">D</emphasis>
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= 200 µm;
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<emphasis id="B9307024FF8FFFCE439DF85B20E5A1AF" bold="true" box="[151,168,1981,2005]" pageId="10" pageNumber="437">E</emphasis>
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=100 µm;
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<emphasis id="B9307024FF8FFFCE4219F85B216FA1AF" bold="true" box="[275,290,1981,2005]" pageId="10" pageNumber="437">F</emphasis>
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=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4086).
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</paragraph>
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</caption>
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<paragraph id="8BFBAC36FF8EFFCF439DFF712167A6CB" blockId="11.[151,298,151,177]" box="[151,298,151,177]" pageId="11" pageNumber="438">
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<heading id="D0B31B5AFF8EFFCF439DFF712167A6CB" bold="true" box="[151,298,151,177]" fontSize="11" level="1" pageId="11" pageNumber="438" reason="1">
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<emphasis id="B9307024FF8EFFCF439DFF712167A6CB" bold="true" box="[151,298,151,177]" pageId="11" pageNumber="438">Nepioconch</emphasis>
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</heading>
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</paragraph>
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<paragraph id="8BFBAC36FF8EFFCF439DFF3924CFA7F3" blockId="11.[151,1437,223,393]" pageId="11" pageNumber="438">
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The microsculpture of the LV shows antimarginal riblets that are widening when these are crossed by thin commarginal growth (
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<figureCitation id="137FB0B3FF8EFFCF4299FEE52240A767" box="[403,525,259,285]" captionStart="FIGURE 4" captionStartId="10.[152,255,1908,1932]" captionTargetBox="[211,1376,181,1884]" captionTargetId="figure-22@10.[211,1376,181,1884]" captionTargetPageId="10" captionText="FIGURE 4. Zygochlamys patagonica. A. Left valve. B. Right valve. C. Post-nepioconch of LV. D. Anterior auricle and byssal notch. E. Microsculpture of Nepioconch of LV. F. Prodissoconch. Scale bars: A= 500 µm; B= 500 µm; C= 200 µm; D= 200 µm; E=100 µm; F=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4086)." figureDoi="http://doi.org/10.5281/zenodo.10151193" httpUri="https://zenodo.org/record/10151193/files/figure.png" pageId="11" pageNumber="438">Fig. 4C, E</figureCitation>
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). This pattern extends onto both the anterior and posterior auricles (
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<figureCitation id="137FB0B3FF8EFFCF4618FEE525C3A767" box="[1298,1422,259,285]" captionStart="FIGURE 4" captionStartId="10.[152,255,1908,1932]" captionTargetBox="[211,1376,181,1884]" captionTargetId="figure-22@10.[211,1376,181,1884]" captionTargetPageId="10" captionText="FIGURE 4. Zygochlamys patagonica. A. Left valve. B. Right valve. C. Post-nepioconch of LV. D. Anterior auricle and byssal notch. E. Microsculpture of Nepioconch of LV. F. Prodissoconch. Scale bars: A= 500 µm; B= 500 µm; C= 200 µm; D= 200 µm; E=100 µm; F=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4086)." figureDoi="http://doi.org/10.5281/zenodo.10151193" httpUri="https://zenodo.org/record/10151193/files/figure.png" pageId="11" pageNumber="438">Fig. 4A, B</figureCitation>
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). The mean height is
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<quantity id="4CBC01D3FF8EFFCF427DFEC12183A738" box="[375,462,295,322]" metricMagnitude="-3" metricUnit="m" metricValue="2.3" pageId="11" pageNumber="438" unit="mm" value="2.3">2.3 mm</quantity>
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(sd = 0.25, n = 6), the mean height of the prismatic stage of the right valve is
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<quantity id="4CBC01D3FF8EFFCF464CFEC125D0A738" box="[1350,1437,295,322]" metricMagnitude="-3" metricUnit="m" metricValue="1.3" pageId="11" pageNumber="438" unit="mm" value="1.3">1.3 mm</quantity>
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(sd = 0.20, n = 6). A radial row of protuberances accompanies the growth of the auricle prismatic stage and extends along the anterior auricle of the right valve (
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<figureCitation id="137FB0B3FF8EFFCF418CFE8922A5A7F3" box="[646,744,367,393]" captionStart="FIGURE 4" captionStartId="10.[152,255,1908,1932]" captionTargetBox="[211,1376,181,1884]" captionTargetId="figure-22@10.[211,1376,181,1884]" captionTargetPageId="10" captionText="FIGURE 4. Zygochlamys patagonica. A. Left valve. B. Right valve. C. Post-nepioconch of LV. D. Anterior auricle and byssal notch. E. Microsculpture of Nepioconch of LV. F. Prodissoconch. Scale bars: A= 500 µm; B= 500 µm; C= 200 µm; D= 200 µm; E=100 µm; F=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4086)." figureDoi="http://doi.org/10.5281/zenodo.10151193" httpUri="https://zenodo.org/record/10151193/files/figure.png" pageId="11" pageNumber="438">Fig. 4 D</figureCitation>
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). The byssal notch is deep and wide.
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</paragraph>
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<paragraph id="8BFBAC36FF8EFFCF439DFE3D2129A78F" blockId="11.[151,356,475,501]" box="[151,356,475,501]" pageId="11" pageNumber="438">
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<heading id="D0B31B5AFF8EFFCF439DFE3D2129A78F" bold="true" box="[151,356,475,501]" fontSize="11" level="1" pageId="11" pageNumber="438" reason="1">
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<emphasis id="B9307024FF8EFFCF439DFE3D2129A78F" bold="true" box="[151,356,475,501]" pageId="11" pageNumber="438">Post-nepioconch</emphasis>
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</heading>
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</paragraph>
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<paragraph id="8BFBAC36FF8EFFCF439DFDC52215A56C" blockId="11.[151,1437,547,970]" pageId="11" pageNumber="438">
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The nepioconch microstructure continues throughout this entire stage only that it becomes interrupted first by primary and then secondary ribs, together around 21 to 31 (mode = 28, n = 6) (
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<tableCitation id="C6C6998DFF8EFFCF40E2FDA12470A41B" box="[1000,1085,583,609]" captionStart="TABLE 4" captionStartId="7.[152,245,151,175]" captionTargetPageId="7" captionText="TABLE 4. Measurements for the early shell of 3 Argentine pectinids. AA = anterior auricle; PA = posterior auricle; AA/ PA = ratio; PriS = prismatic stage; NR = number of ribs; AC = teeth of active ctenolium; N = Nepioconch of left valve (*). Measurements in mm, angles in degree (º)." pageId="11" pageNumber="438">Table 4</tableCitation>
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). Where ribs meet commarginal growth steps, they become nodular; these nodules are best developed on the disc flanks and are more conspicuous on the LV than RV (
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<figureCitation id="137FB0B3FF8EFFCF427EFD6921A0A4D3" box="[372,493,655,681]" captionStart="FIGURE 4" captionStartId="10.[152,255,1908,1932]" captionTargetBox="[211,1376,181,1884]" captionTargetId="figure-22@10.[211,1376,181,1884]" captionTargetPageId="10" captionText="FIGURE 4. Zygochlamys patagonica. A. Left valve. B. Right valve. C. Post-nepioconch of LV. D. Anterior auricle and byssal notch. E. Microsculpture of Nepioconch of LV. F. Prodissoconch. Scale bars: A= 500 µm; B= 500 µm; C= 200 µm; D= 200 µm; E=100 µm; F=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4086)." figureDoi="http://doi.org/10.5281/zenodo.10151193" httpUri="https://zenodo.org/record/10151193/files/figure.png" pageId="11" pageNumber="438">Fig. 4A, B</figureCitation>
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). The riblet-and-gutter microsculpture fills only the interspaces not crossing the ribs; they do become more pronouncedly antimarginal-like and also divergent. On the disc flanks, they meet the shell margin at a rather oblique angle. The sculpture is less conspicuous on the central disc. It is also present on both LV auricles and the posterior one of the RV.
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</paragraph>
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<paragraph id="8BFBAC36FF8EFFCF43CDFCF92433A5B0" blockId="11.[151,1437,547,970]" pageId="11" pageNumber="438">
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The anterior auricle is slightly longer than the posterior one, giving an AA/PA ratio of 1.33 (n = 6) (
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<tableCitation id="C6C6998DFF8EFFCF4602FCF92513A543" box="[1288,1374,799,825]" captionStart="TABLE 4" captionStartId="7.[152,245,151,175]" captionTargetPageId="7" captionText="TABLE 4. Measurements for the early shell of 3 Argentine pectinids. AA = anterior auricle; PA = posterior auricle; AA/ PA = ratio; PriS = prismatic stage; NR = number of ribs; AC = teeth of active ctenolium; N = Nepioconch of left valve (*). Measurements in mm, angles in degree (º)." pageId="11" pageNumber="438">Table 4</tableCitation>
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). The free margins of the posterior auricles can be slightly anteriorly inclined and the free margins of the anterior auricle of LV is straight or inclined slightly toward anterior. The byssal notch is as wide as in the previous stage, and the active ctenolium presents two or three free hooked teeth (mode = 3; n = 6) (
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<figureCitation id="137FB0B3FF8EFFCF40FEFC6D241DA5DF" box="[1012,1104,907,933]" captionStart="FIGURE 4" captionStartId="10.[152,255,1908,1932]" captionTargetBox="[211,1376,181,1884]" captionTargetId="figure-22@10.[211,1376,181,1884]" captionTargetPageId="10" captionText="FIGURE 4. Zygochlamys patagonica. A. Left valve. B. Right valve. C. Post-nepioconch of LV. D. Anterior auricle and byssal notch. E. Microsculpture of Nepioconch of LV. F. Prodissoconch. Scale bars: A= 500 µm; B= 500 µm; C= 200 µm; D= 200 µm; E=100 µm; F=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4086)." figureDoi="http://doi.org/10.5281/zenodo.10151193" httpUri="https://zenodo.org/record/10151193/files/figure.png" pageId="11" pageNumber="438">Fig. 4D</figureCitation>
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). The mean umbonal angle is 89° (n = 6). (
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<tableCitation id="C6C6998DFF8EFFCF422DFC492132A5B3" box="[295,383,943,969]" captionStart="TABLE 4" captionStartId="7.[152,245,151,175]" captionTargetPageId="7" captionText="TABLE 4. Measurements for the early shell of 3 Argentine pectinids. AA = anterior auricle; PA = posterior auricle; AA/ PA = ratio; PriS = prismatic stage; NR = number of ribs; AC = teeth of active ctenolium; N = Nepioconch of left valve (*). Measurements in mm, angles in degree (º)." pageId="11" pageNumber="438">Table 4</tableCitation>
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). Shell color is orange under natural light but less intense on the RV.
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</paragraph>
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</subSubSection>
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</treatment>
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</document> |