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<mods:title id="DAECE0E603B97409B4D944800552CD43">Description of the early shell morphology of three species of Pectinidae (Mollusca: Bivalvia) from Argentina</mods:title>
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<mods:namePart id="8418A20A562B829049633D9F9A8A56D5">Oviedo, Loreley</mods:namePart>
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<treatment id="03ED1D20FF8DFFCC439DFDA0224BA0D3" ID-GBIF-Taxon="217742961" LSID="urn:lsid:plazi:treatment:03ED1D20FF8DFFCC439DFDA0224BA0D3" httpUri="http://treatment.plazi.org/id/03ED1D20FF8DFFCC439DFDA0224BA0D3" lastPageNumber="435" pageId="8" pageNumber="435">
<subSubSection id="C35EFFBDFF8DFFCC439DFDA02209A41A" box="[151,580,582,609]" pageId="8" pageNumber="435" type="nomenclature">
<paragraph id="8BFBAC36FF8DFFCC439DFDA02209A41A" blockId="8.[151,580,582,645]" box="[151,580,582,609]" pageId="8" pageNumber="435">
<heading id="D0B31B5AFF8DFFCC439DFDA02209A41A" bold="true" box="[151,580,582,609]" fontSize="11" level="1" pageId="8" pageNumber="435" reason="1">
<taxonomicName id="4C44D7B5FF8DFFCC439DFDA02209A41A" ID-CoL="6J8MR" authority="(Dall, 1922)" baseAuthorityName="Dall" baseAuthorityYear="1922" box="[151,580,582,609]" class="Bivalvia" family="Pectinidae" genus="Flexopecten" kingdom="Animalia" order="Pectinida" pageId="8" pageNumber="435" phylum="Mollusca" rank="species" species="felipponei">
<emphasis id="B9307024FF8DFFCC439DFDA02209A41A" bold="true" box="[151,580,582,609]" pageId="8" pageNumber="435">
<emphasis id="B9307024FF8DFFCC439DFDA021E1A41B" bold="true" box="[151,428,582,609]" italics="true" pageId="8" pageNumber="435">Flexopecten felipponei</emphasis>
(
<bibRefCitation id="EFD5D1C7FF8DFFCC42B1FDA02276A41A" author="Dall, W. H." box="[443,571,582,608]" pageId="8" pageNumber="435" pagination="58 - 59" refId="ref8389" refString="Dall, W. H. (1922) Two new bivalves from Argentina: The Nautilus, 36, 58 - 59." type="journal article" year="1922">Dall, 1922</bibRefCitation>
)
</emphasis>
</taxonomicName>
</heading>
</paragraph>
</subSubSection>
<subSubSection id="C35EFFBDFF8DFFCC439DFD8D20B8A4FF" box="[151,245,619,645]" pageId="8" pageNumber="435" type="description">
<paragraph id="8BFBAC36FF8DFFCC439DFD8D20B8A4FF" blockId="8.[151,580,582,645]" box="[151,245,619,645]" pageId="8" pageNumber="435">
<figureCitation id="137FB0B3FF8DFFCC439DFD8D20B8A4FF" box="[151,245,619,645]" captionStart="FIGURE 3" captionStartId="9.[152,255,1908,1932]" captionTargetBox="[188,1398,181,1884]" captionTargetId="figure-19@9.[188,1398,181,1884]" captionTargetPageId="9" captionText="FIGURE 3. Flexopecten felipponei. A. Left valve. B. Right valve. C. Fold of Post-nepioconch of LV stage. D. Anterior auricle and byssal notch. E. Microsculpture of LV Nepioconch. F. Prodissoconch of RV. Scale bars: A= 1 mm; B= 1 mm; C= 200 µm; D= 400 µm; E = 80 µm; F=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4084)." figureDoi="http://doi.org/10.5281/zenodo.10151191" httpUri="https://zenodo.org/record/10151191/files/figure.png" pageId="8" pageNumber="435">Figure 3</figureCitation>
</paragraph>
</subSubSection>
<subSubSection id="C35EFFBDFF8DFFCC439DFD54224BA0D3" pageId="8" pageNumber="435" type="discussion">
<paragraph id="8BFBAC36FF8DFFCC439DFD542106A4B6" blockId="8.[151,331,690,716]" box="[151,331,690,716]" pageId="8" pageNumber="435">
<heading id="D0B31B5AFF8DFFCC439DFD542106A4B6" bold="true" box="[151,331,690,716]" fontSize="11" level="1" pageId="8" pageNumber="435" reason="1">
<emphasis id="B9307024FF8DFFCC439DFD542106A4B6" bold="true" box="[151,331,690,716]" pageId="8" pageNumber="435">Prodissoconch</emphasis>
</heading>
</paragraph>
<paragraph id="8BFBAC36FF8DFFCC439DFD1D229EA527" blockId="8.[151,1436,763,861]" pageId="8" pageNumber="435">
The Prodissoconch-1 has a faint radial striation, without distinct commarginal growth lines, mean length is 81 µm (n = 2). The Prodissoconch-2 has thin commarginal growth lines, mean length of the P-2 is 197 µm (n = 2), and P-1/P-2 length ratio is 0.41 (n = 2) (
<tableCitation id="C6C6998DFF8DFFCC4105FCA52229A527" box="[527,612,835,861]" 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>
,
<figureCitation id="137FB0B3FF8DFFCC417BFCA5228BA527" box="[625,710,835,861]" captionStart="FIGURE 3" captionStartId="9.[152,255,1908,1932]" captionTargetBox="[188,1398,181,1884]" captionTargetId="figure-19@9.[188,1398,181,1884]" captionTargetPageId="9" captionText="FIGURE 3. Flexopecten felipponei. A. Left valve. B. Right valve. C. Fold of Post-nepioconch of LV stage. D. Anterior auricle and byssal notch. E. Microsculpture of LV Nepioconch. F. Prodissoconch of RV. Scale bars: A= 1 mm; B= 1 mm; C= 200 µm; D= 400 µm; E = 80 µm; F=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4084)." figureDoi="http://doi.org/10.5281/zenodo.10151191" httpUri="https://zenodo.org/record/10151191/files/figure.png" pageId="8" pageNumber="435">Fig. 3F</figureCitation>
).
</paragraph>
<paragraph id="8BFBAC36FF8DFFCC439DFC482167A5B2" blockId="8.[151,298,942,968]" box="[151,298,942,968]" pageId="8" pageNumber="435">
<heading id="D0B31B5AFF8DFFCC439DFC482167A5B2" bold="true" box="[151,298,942,968]" fontSize="11" level="1" pageId="8" pageNumber="435" reason="1">
<emphasis id="B9307024FF8DFFCC439DFC482167A5B2" bold="true" box="[151,298,942,968]" pageId="8" pageNumber="435">Nepioconch</emphasis>
</heading>
</paragraph>
<paragraph id="8BFBAC36FF8DFFCC439DFC11251AA24F" blockId="8.[151,1437,1015,1149]" pageId="8" pageNumber="435">
The microsculpture of the LV is fine and presents regularly and densely distributed pits (
<figureCitation id="137FB0B3FF8DFFCC4777FC112554A26B" box="[1149,1305,1015,1041]" captionStart="FIGURE 3" captionStartId="9.[152,255,1908,1932]" captionTargetBox="[188,1398,181,1884]" captionTargetId="figure-19@9.[188,1398,181,1884]" captionTargetPageId="9" captionText="FIGURE 3. Flexopecten felipponei. A. Left valve. B. Right valve. C. Fold of Post-nepioconch of LV stage. D. Anterior auricle and byssal notch. E. Microsculpture of LV Nepioconch. F. Prodissoconch of RV. Scale bars: A= 1 mm; B= 1 mm; C= 200 µm; D= 400 µm; E = 80 µm; F=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4084)." figureDoi="http://doi.org/10.5281/zenodo.10151191" httpUri="https://zenodo.org/record/10151191/files/figure.png" pageId="8" pageNumber="435">Fig. 3A, C, E</figureCitation>
). The mean height of the LV is
<quantity id="4CBC01D3FF8DFFCC4265FBFD219EA24F" box="[367,467,1051,1077]" metricMagnitude="-3" metricUnit="m" metricValue="1.97" pageId="8" pageNumber="435" unit="mm" value="1.97">1.97 mm</quantity>
(n = 2) and the height of the prismatic stage of RV is
<quantity id="4CBC01D3FF8DFFCC4727FBFD24DCA24F" box="[1069,1169,1051,1077]" metricMagnitude="-3" metricUnit="m" metricValue="1.93" pageId="8" pageNumber="435" unit="mm" value="1.93">1.93 mm</quantity>
(n = 2) (
<tableCitation id="C6C6998DFF8DFFCC47F8FBFD2507A24F" box="[1266,1354,1051,1077]" 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="8" pageNumber="435">Table 4</tableCitation>
).
</paragraph>
<paragraph id="8BFBAC36FF8DFFCC43CDFBD9228DA207" blockId="8.[151,1437,1015,1149]" pageId="8" pageNumber="435">The ctenolium develops during the prismatic stage; the AA has an auricle prismatic stage. The byssal notch (RV) is deep, the byssal sinus (LV) still incipient.</paragraph>
<paragraph id="8BFBAC36FF8DFFCC439DFB272129A2A1" blockId="8.[151,356,1217,1243]" box="[151,356,1217,1243]" pageId="8" pageNumber="435">
<heading id="D0B31B5AFF8DFFCC439DFB272129A2A1" bold="true" box="[151,356,1217,1243]" fontSize="11" level="1" pageId="8" pageNumber="435" reason="1">
<emphasis id="B9307024FF8DFFCC439DFB272129A2A1" bold="true" box="[151,356,1217,1243]" pageId="8" pageNumber="435">Post-nepioconch</emphasis>
</heading>
</paragraph>
<paragraph id="8BFBAC36FF8DFFCC439DFAE5222AA3F3" blockId="8.[151,1437,1283,1705]" pageId="8" pageNumber="435">
Ribs begin to develop rather early underlying the pitted and prismatic layer, respectively. The left valve has 28 to 34 faint folds (n = 2), with primary and secondary ribs being difficult to distinguish; there are no scales (
<figureCitation id="137FB0B3FF8DFFCC4615FAC120E0A31F" captionStart="FIGURE 3" captionStartId="9.[152,255,1908,1932]" captionTargetBox="[188,1398,181,1884]" captionTargetId="figure-19@9.[188,1398,181,1884]" captionTargetPageId="9" captionText="FIGURE 3. Flexopecten felipponei. A. Left valve. B. Right valve. C. Fold of Post-nepioconch of LV stage. D. Anterior auricle and byssal notch. E. Microsculpture of LV Nepioconch. F. Prodissoconch of RV. Scale bars: A= 1 mm; B= 1 mm; C= 200 µm; D= 400 µm; E = 80 µm; F=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4084)." figureDoi="http://doi.org/10.5281/zenodo.10151191" httpUri="https://zenodo.org/record/10151191/files/figure.png" pageId="8" pageNumber="435">Fig. 3A, B, C</figureCitation>
). The microsculpture of the fold interspaces morphs into elongate pits that, towards the shell edge, become fine antimarginal ridges and gutters (
<figureCitation id="137FB0B3FF8DFFCC4108FA892217A3F3" box="[514,602,1391,1417]" captionStart="FIGURE 3" captionStartId="9.[152,255,1908,1932]" captionTargetBox="[188,1398,181,1884]" captionTargetId="figure-19@9.[188,1398,181,1884]" captionTargetPageId="9" captionText="FIGURE 3. Flexopecten felipponei. A. Left valve. B. Right valve. C. Fold of Post-nepioconch of LV stage. D. Anterior auricle and byssal notch. E. Microsculpture of LV Nepioconch. F. Prodissoconch of RV. Scale bars: A= 1 mm; B= 1 mm; C= 200 µm; D= 400 µm; E = 80 µm; F=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4084)." figureDoi="http://doi.org/10.5281/zenodo.10151191" httpUri="https://zenodo.org/record/10151191/files/figure.png" pageId="8" pageNumber="435">Fig. 3C</figureCitation>
).
</paragraph>
<paragraph id="8BFBAC36FF8DFFCC43CDFA7521FEA38F" blockId="8.[151,1437,1283,1705]" pageId="8" pageNumber="435">
The posterior and anterior auricles of the LV, and the posterior auricle of the RV show similar microsculpture patterns, interrupted by prominent growth ridges. The posterior auricle is slightly longer than the anterior one (ratio AA/PA = 0.92) (
<tableCitation id="C6C6998DFF8DFFCC4244FA3D21E8A38F" box="[334,421,1499,1525]" 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="8" pageNumber="435">Table 4</tableCitation>
).
</paragraph>
<paragraph id="8BFBAC36FF8DFFCC43CDFA19224BA0D3" blockId="8.[151,1437,1283,1705]" pageId="8" pageNumber="435">
The free margin of posterior auricles is straight whereas the one in the anterior auricle is anteriorly inclined. Two well defined ribs start from the auricle prismatic stage of the anterior auricle (n = 2) (
<figureCitation id="137FB0B3FF8DFFCC47B8F9C52540A047" box="[1202,1293,1571,1597]" captionStart="FIGURE 3" captionStartId="9.[152,255,1908,1932]" captionTargetBox="[188,1398,181,1884]" captionTargetId="figure-19@9.[188,1398,181,1884]" captionTargetPageId="9" captionText="FIGURE 3. Flexopecten felipponei. A. Left valve. B. Right valve. C. Fold of Post-nepioconch of LV stage. D. Anterior auricle and byssal notch. E. Microsculpture of LV Nepioconch. F. Prodissoconch of RV. Scale bars: A= 1 mm; B= 1 mm; C= 200 µm; D= 400 µm; E = 80 µm; F=100 µm. All specimens from Fracasso Beach (42.39754S, 64.19199W), Chubut Province, Argentina (CNP-INV 4084)." figureDoi="http://doi.org/10.5281/zenodo.10151191" httpUri="https://zenodo.org/record/10151191/files/figure.png" pageId="8" pageNumber="435">Fig. 3D</figureCitation>
). The byssal notch becomes sinuous and the byssal sinus is more conspicuous than in the nepioconch. The active ctenolium presents three to four teeth (n = 2) (
<tableCitation id="C6C6998DFF8DFFCC412AF98D2235A0FF" box="[544,632,1643,1669]" 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="8" pageNumber="435">Table 4</tableCitation>
). The umbonal angle is obtuse (α =100º) (n = 2) (
<tableCitation id="C6C6998DFF8DFFCC4797F98D24B9A0FF" box="[1181,1268,1643,1669]" 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="8" pageNumber="435">Table 4</tableCitation>
). The shell can be white or light yellow in color.
</paragraph>
</subSubSection>
</treatment>
</document>