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<mods:title id="907955535E6EA11FCF0578F0354B111C">The Late Pleistocene mollusk fauna of Selitrennoye (Astrakhan province, Russia): A natural baseline for endemic Caspian Sea faunas</mods:title>
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<mods:namePart id="D1AB0E4D3B056295A3D6A4C08CC6D85A">Yanina, Tamara A.</mods:namePart>
<mods:affiliation id="F1CD99F517AB74755B0983599D0795E3">Moscow State University, Faculty of Geography, Leninskie Gory, 1, 119991 Moscow, Russia</mods:affiliation>
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<subSubSection id="9D854AAFFF92FFC9FF37BF84701CFC69" box="[132,537,962,982]" pageId="8" pageNumber="1235" type="nomenclature">
<paragraph id="D5201924FF92FFC9FF37BF84701CFC69" blockId="8.[100,770,182,1113]" box="[132,537,962,982]" pageId="8" pageNumber="1235">
<heading id="8E68AE48FF92FFC9FF37BF84701CFC69" box="[132,537,962,982]" pageId="8" pageNumber="1235">
<taxonomicName id="129F62A7FF92FFC9FF37BF8473FDFC69" authority="(Eichwald, 1829)" baseAuthorityName="Eichwald" baseAuthorityYear="1829" box="[132,504,962,982]" class="Bivalvia" family="Cardiidae" genus="Monodacna" kingdom="Animalia" order="Veneroida" pageId="8" pageNumber="1235" phylum="Mollusca" rank="species" sensu="lato" species="caspia">
<emphasis id="E7EBC536FF92FFC9FF37BF847343FC69" bold="true" box="[132,326,962,982]" italics="true" pageId="8" pageNumber="1235">Monodacna caspia</emphasis>
(
<bibRefCitation id="B10E64D5FF92FFC9FEE6BF8573F5FC69" author="Eichwald, E." box="[341,496,963,982]" pageId="8" pageNumber="1235" refId="ref12062" refString="Eichwald, E., 1829. Zoologia specialis quam expositis animalibus tum vivis, tum fossilibus potissimum Rossiae in universum et Poloniae in specie, in usum lectionum publicarum in Universitate Caesarea Vilnensi habendarum. Pars prior propaedeuticam zoologiae atque specialem heterozoorum expositionem continens. Joseph Zawadzki, Vilnius." type="book" year="1829">Eichwald, 1829</bibRefCitation>
)
</taxonomicName>
<taxonomicNameLabel id="FCD8784DFF92FFC9FE4CBF85701CFC69" box="[511,537,963,982]" pageId="8" pageNumber="1235" sensu="lato">s.l.</taxonomicNameLabel>
</heading>
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<subSubSection id="9D854AAFFF92FFC9FD93BF8570E0FC69" box="[544,741,963,983]" pageId="8" pageNumber="1235" type="description">
<paragraph id="D5201924FF92FFC9FD93BF8570E0FC69" blockId="8.[100,770,182,1113]" box="[544,741,963,983]" pageId="8" pageNumber="1235">
(
<figureCitation id="4DA405A1FF92FFC9FD9ABF85705AFC69" box="[553,607,963,982]" captionStart="Fig" captionStartId="5.[100,126,1185,1199]" captionTargetBox="[345,1246,184,1153]" captionTargetId="figure-508@5.[342,1249,181,1156]" captionTargetPageId="5" captionText="Fig. 4. Cardiidae. (1) Adacna laeviuscula; (a) RGM.1309812 LV; (b) RGM.1309813 RV. (2) Adacna minima; (A) RGM.1309811 LV; (b) RGM.1309810 RV. (3) Monodacna semipellucida, RGM.1309802 RV; (4) Monodacna caspia s.l. (a) RGM.1309803 LV; (b) RGM.1309804 RV. (5) Hypanis plicata; (a) RGM.1309808 LV (b) RGM.1309809 RV. Scale bars = 1 cm." figureDoi="http://doi.org/10.5281/zenodo.5019208" httpUri="https://zenodo.org/record/5019208/files/figure.png" pageId="8" pageNumber="1235">Fig. 4</figureCitation>
: 4,
<figureCitation id="4DA405A1FF92FFC9FD34BF8570B8FC68" box="[647,701,963,983]" captionStart="Fig" captionStartId="8.[100,126,1953,1967]" captionTargetBox="[345,1246,1192,1921]" captionTargetId="figure-703@8.[342,1249,1189,1924]" captionTargetPageId="8" captionText="Fig. 7. Plasticity (shape variability) of (1) Monodacna caspia RGM.1309807. (a) umbo in the middle, more square (b) umbo not in middle, more round (c) umbo in the middle, oval (d) umbo not in middle, more oval shape. (2) Dreissena elata. (a) RGM.1310278 short, curved (b) RGM.1310280 medium, curved (c) RGM.1310280 long, curved (d) RGM.1310280 medium, straight (e) RGM.1310282 long, straight. Scale bars = 1 mm." figureDoi="http://doi.org/10.5281/zenodo.5019214" httpUri="https://zenodo.org/record/5019214/files/figure.png" pageId="8" pageNumber="1235">Fig. 7</figureCitation>
: 1).
</paragraph>
</subSubSection>
<subSubSection id="9D854AAFFF92FFC9FF37BF9B73A6FBE7" pageId="8" pageNumber="1235" type="reference_group">
<paragraph id="D5201924FF92FFC9FF37BF9B7078FC4F" blockId="8.[100,770,182,1113]" box="[132,637,988,1009]" pageId="8" pageNumber="1235">
<treatmentCitationGroup id="F58F3E0AFF92FFC9FF37BF9B7078FC4F" box="[132,637,988,1009]" pageId="8" pageNumber="1235">
<treatmentCitation id="543E3F35FF92FFC9FF37BF9B7004FC4F" author="Eichwald, E." box="[132,513,988,1009]" page="281" pageId="8" pageNumber="1235" year="1829">
*1829
<emphasis id="E7EBC536FF92FFC9FF75BF9A72DCFC4F" box="[198,217,988,1008]" italics="true" pageId="8" pageNumber="1235">C.</emphasis>
[
<emphasis id="E7EBC536FF92FFC9FF53BF9A731BFC4F" box="[224,286,988,1008]" italics="true" pageId="8" pageNumber="1235">orbula</emphasis>
]
<taxonomicName id="129F62A7FF92FFC9FE9EBF9A73D4FC4F" authority="Eichwald" authorityName="Eichwald" box="[301,465,988,1008]" class="Bivalvia" family="Cardiidae" genus="Monodacna" kingdom="Animalia" order="Veneroida" pageId="8" pageNumber="1235" phylum="Mollusca" rank="species" species="caspia">
<emphasis id="E7EBC536FF92FFC9FE9EBF9A736CFC4F" box="[301,361,988,1008]" italics="true" pageId="8" pageNumber="1235">caspia</emphasis>
Eichwald
</taxonomicName>
: 281
</treatmentCitation>
, pl. 5, fig. 6.
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</paragraph>
<paragraph id="D5201924FF92FFC9FF37BFB17311FB9A" blockId="8.[100,770,182,1113]" pageId="8" pageNumber="1235">
<treatmentCitationGroup id="F58F3E0AFF92FFC9FF37BFB17311FB9A" pageId="8" pageNumber="1235">
1986
<taxonomicName id="129F62A7FF92FFC9FF0EBFB07026FBB4" authority="(Eichwald), 1938" baseAuthorityName="Eichwald" baseAuthorityYear="1938" box="[189,547,1014,1035]" class="Bivalvia" family="Cardiidae" genus="Monodacna" kingdom="Animalia" order="Veneroida" pageId="8" pageNumber="1235" phylum="Mollusca" rank="species" species="caspia">
<emphasis id="E7EBC536FF92FFC9FF0EBFB07374FBB5" box="[189,369,1014,1034]" italics="true" pageId="8" pageNumber="1235">Monodacna caspia</emphasis>
(Eichwald), 1938
</taxonomicName>
<treatmentCitation id="543E3F35FF92FFC9FD8DBFB1727BFB9A" author="Yakhimovich et al." page="84" pageId="8" pageNumber="1235" year="1986">Yakhimovich et al.: 84</treatmentCitation>
, pl. 12, fig. 12.
</treatmentCitationGroup>
</paragraph>
<paragraph id="D5201924FF92FFC9FF37B86A73A6FBE7" blockId="8.[100,770,182,1113]" pageId="8" pageNumber="1235">
<treatmentCitationGroup id="F58F3E0AFF92FFC9FF37B86A73A6FBE7" pageId="8" pageNumber="1235">
2013
<taxonomicName id="129F62A7FF92FFC9FF70B86C70EDFB80" authority="caspia (Eichwald, 1829)" authorityName="caspia (Eichwald" authorityYear="1829" baseAuthorityName="Eichwald" baseAuthorityYear="1829" box="[195,744,1066,1087]" class="Bivalvia" family="Cardiidae" genus="Adacna" kingdom="Animalia" order="Veneroida" pageId="8" pageNumber="1235" phylum="Mollusca" rank="subSpecies" species="caspia" subGenus="Monodacna" subSpecies="caspia">
<emphasis id="E7EBC536FF92FFC9FF70B86C730FFB81" box="[195,266,1066,1086]" italics="true" pageId="8" pageNumber="1235">Adacna</emphasis>
(
<emphasis id="E7EBC536FF92FFC9FEACB86C738AFB81" box="[287,399,1066,1086]" italics="true" pageId="8" pageNumber="1235">Monodacna</emphasis>
)
<emphasis id="E7EBC536FF92FFC9FE16B86C702FFB81" box="[421,554,1066,1086]" italics="true" pageId="8" pageNumber="1235">caspia caspia</emphasis>
(
<bibRefCitation id="B10E64D5FF92FFC9FD8CB86D70E5FB80" author="Eichwald, E." box="[575,736,1067,1087]" pageId="8" pageNumber="1235" refId="ref12062" refString="Eichwald, E., 1829. Zoologia specialis quam expositis animalibus tum vivis, tum fossilibus potissimum Rossiae in universum et Poloniae in specie, in usum lectionum publicarum in Universitate Caesarea Vilnensi habendarum. Pars prior propaedeuticam zoologiae atque specialem heterozoorum expositionem continens. Joseph Zawadzki, Vilnius." type="book" year="1829">Eichwald, 1829</bibRefCitation>
)
</taxonomicName>
<treatmentCitation id="543E3F35FF92FFC9FFD7B8037343FBE6" author="Bogutskaya et al" box="[100,326,1093,1113]" page="380" pageId="8" pageNumber="1235" year="2013">Bogutskaya et al.: 380</treatmentCitation>
, fig. 154.
</treatmentCitationGroup>
</paragraph>
</subSubSection>
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<paragraph id="D5201924FF92FFC9FCE2BCF37705FF75" blockId="8.[818,1488,181,1087]" box="[849,1280,181,202]" pageId="8" pageNumber="1235">
<emphasis id="E7EBC536FF92FFC9FCE2BCF371C5FF76" box="[849,960,181,201]" italics="true" pageId="8" pageNumber="1235">Dimensions</emphasis>
max. L
<quantity id="1267B4C1FF92FFC9FB97BCF0767AFF75" box="[1060,1151,182,202]" metricMagnitude="-2" metricUnit="m" metricValue="2.33" pageId="8" pageNumber="1235" unit="mm" value="23.3">23.3 mm</quantity>
, H
<quantity id="1267B4C1FF92FFC9FB12BCF076F8FF75" box="[1185,1277,182,202]" metricMagnitude="-2" metricUnit="m" metricValue="1.86" pageId="8" pageNumber="1235" unit="mm" value="18.6">18.6 mm</quantity>
.
</paragraph>
<paragraph id="D5201924FF92FFC9FCE2BC8977C0FD3B" blockId="8.[818,1488,181,1087]" pageId="8" pageNumber="1235">
<emphasis id="E7EBC536FF92FFC9FCE2BC8971EAFF5C" box="[849,1007,207,227]" italics="true" pageId="8" pageNumber="1235">Characterization</emphasis>
The small-sized cardiid shows a variety of shapes and sizes in our Selitrennoye material. The presence of a series of intermediate morphologies (
<figureCitation id="4DA405A1FF92FFC9FB1BBD4276D8FEA7" box="[1192,1245,260,280]" captionStart="Fig" captionStartId="8.[100,126,1953,1967]" captionTargetBox="[345,1246,1192,1921]" captionTargetId="figure-703@8.[342,1249,1189,1924]" captionTargetPageId="8" captionText="Fig. 7. Plasticity (shape variability) of (1) Monodacna caspia RGM.1309807. (a) umbo in the middle, more square (b) umbo not in middle, more round (c) umbo in the middle, oval (d) umbo not in middle, more oval shape. (2) Dreissena elata. (a) RGM.1310278 short, curved (b) RGM.1310280 medium, curved (c) RGM.1310280 long, curved (d) RGM.1310280 medium, straight (e) RGM.1310282 long, straight. Scale bars = 1 mm." figureDoi="http://doi.org/10.5281/zenodo.5019214" httpUri="https://zenodo.org/record/5019214/files/figure.png" pageId="8" pageNumber="1235">Fig. 7</figureCitation>
: 1ad) suggests a single polymorphic species. All specimens have a single cardinal tooth and lack the lateral tooth that typifies
<taxonomicName id="129F62A7FF92FFC9FB1FBD717719FEF4" authorityName="Eichwald" authorityYear="1838" box="[1196,1308,311,331]" class="Bivalvia" family="Cardiidae" genus="Monodacna" kingdom="Animalia" order="Veneroida" pageId="8" pageNumber="1235" phylum="Mollusca" rank="genus">
<emphasis id="E7EBC536FF92FFC9FB1FBD717719FEF4" box="[1196,1308,311,331]" italics="true" pageId="8" pageNumber="1235">Monodacna</emphasis>
</taxonomicName>
, yet the thickness and expression of the hinge is extremely variable. Acommon form is thin-shelled, relatively convex with straight posterior margin and relatively well developed, regularly spaced but thin ribs (
<figureCitation id="4DA405A1FF92FFC9FC89BDE77177FE0B" box="[826,882,417,436]" captionStart="Fig" captionStartId="8.[100,126,1953,1967]" captionTargetBox="[345,1246,1192,1921]" captionTargetId="figure-703@8.[342,1249,1189,1924]" captionTargetPageId="8" captionText="Fig. 7. Plasticity (shape variability) of (1) Monodacna caspia RGM.1309807. (a) umbo in the middle, more square (b) umbo not in middle, more round (c) umbo in the middle, oval (d) umbo not in middle, more oval shape. (2) Dreissena elata. (a) RGM.1310278 short, curved (b) RGM.1310280 medium, curved (c) RGM.1310280 long, curved (d) RGM.1310280 medium, straight (e) RGM.1310282 long, straight. Scale bars = 1 mm." figureDoi="http://doi.org/10.5281/zenodo.5019214" httpUri="https://zenodo.org/record/5019214/files/figure.png" pageId="8" pageNumber="1235">Fig. 7</figureCitation>
: 1c). This shape conforms to shells of
<taxonomicName id="129F62A7FF92FFC9FAB0BDE6775AFE0B" box="[1283,1375,416,436]" class="Bivalvia" family="Cardiidae" genus="Adacna" kingdom="Animalia" order="Veneroida" pageId="8" pageNumber="1235" phylum="Mollusca" rank="species" species="caspia">
<emphasis id="E7EBC536FF92FFC9FAB0BDE6775AFE0B" box="[1283,1375,416,436]" italics="true" pageId="8" pageNumber="1235">M. caspia</emphasis>
</taxonomicName>
illustrated in
<bibRefCitation id="B10E64D5FF92FFC9FCE2BDFD7656FE71" author="Bogutskaya, N. G. &amp; Kijashko, P. V. &amp; Naseka, A. M. &amp; Orlova, M. I." box="[849,1107,443,462]" journalOrPublisher="KMK Scientific Press Ltd., St. Petersburg - Moscow" pageId="8" pageNumber="1235" refId="ref11824" refString="Bogutskaya, N. G., Kijashko, P. V., Naseka, A. M., Orlova, M. I., 2013. Identification keys for fish and invertebrates. Volume 1: Fish and molluscs. KMK Scientific Press Ltd., St. Petersburg - Moscow." title="Identification keys for fish and invertebrates" type="book" year="2013">Bogutskaya et al. (2013)</bibRefCitation>
. Another form is flatter, in general slightly thicker shelled and has a distinct wedge-shape (
<figureCitation id="4DA405A1FF92FFC9FA3EBD9377CDFE57" box="[1421,1480,469,488]" captionStart="Fig" captionStartId="8.[100,126,1953,1967]" captionTargetBox="[345,1246,1192,1921]" captionTargetId="figure-703@8.[342,1249,1189,1924]" captionTargetPageId="8" captionText="Fig. 7. Plasticity (shape variability) of (1) Monodacna caspia RGM.1309807. (a) umbo in the middle, more square (b) umbo not in middle, more round (c) umbo in the middle, oval (d) umbo not in middle, more oval shape. (2) Dreissena elata. (a) RGM.1310278 short, curved (b) RGM.1310280 medium, curved (c) RGM.1310280 long, curved (d) RGM.1310280 medium, straight (e) RGM.1310282 long, straight. Scale bars = 1 mm." figureDoi="http://doi.org/10.5281/zenodo.5019214" httpUri="https://zenodo.org/record/5019214/files/figure.png" pageId="8" pageNumber="1235">Fig. 7</figureCitation>
: 1a). Its ribs are lower and slightly more irregular than in the previous form. This wedge-shaped form conforms to several modern
<taxonomicName id="129F62A7FF92FFC9FC81BE6471F6FD89" box="[818,1011,546,566]" class="Bivalvia" family="Cardiidae" genus="Monodacna" kingdom="Animalia" order="Veneroida" pageId="8" pageNumber="1235" phylum="Mollusca" rank="species" species="undetermined">
<emphasis id="E7EBC536FF92FFC9FC81BE6471A7FD89" box="[818,930,546,566]" italics="true" pageId="8" pageNumber="1235">Monodacna</emphasis>
species
</taxonomicName>
as reported in
<bibRefCitation id="B10E64D5FF92FFC9FB29BE657792FD89" author="Bogutskaya, N. G. &amp; Kijashko, P. V. &amp; Naseka, A. M. &amp; Orlova, M. I." box="[1178,1431,547,566]" journalOrPublisher="KMK Scientific Press Ltd., St. Petersburg - Moscow" pageId="8" pageNumber="1235" refId="ref11824" refString="Bogutskaya, N. G., Kijashko, P. V., Naseka, A. M., Orlova, M. I., 2013. Identification keys for fish and invertebrates. Volume 1: Fish and molluscs. KMK Scientific Press Ltd., St. Petersburg - Moscow." title="Identification keys for fish and invertebrates" type="book" year="2013">Bogutskaya et al. (2013)</bibRefCitation>
such as
<taxonomicName id="129F62A7FF92FFC9FCFDBE7A7786FDEF" authority="(Logvinenko and Starobogatov, 1967)" baseAuthorityName="Logvinenko and Starobogatov" baseAuthorityYear="1967" box="[846,1411,572,592]" class="Bivalvia" family="Cardiidae" genus="Monodacna" kingdom="Animalia" order="Veneroida" pageId="8" pageNumber="1235" phylum="Mollusca" rank="species" species="albida">
<emphasis id="E7EBC536FF92FFC9FCFDBE7A7604FDEF" box="[846,1025,572,592]" italics="true" pageId="8" pageNumber="1235">Monodacna albida</emphasis>
(
<bibRefCitation id="B10E64D5FF92FFC9FBA3BE7B777EFDEF" author="Logvinenko, B. M. &amp; Starobogatov, Y. I." box="[1040,1403,573,592]" editor="Kudritskiy, D. M." journalOrPublisher="Nauka, Leningrad" pageId="8" pageNumber="1235" pagination="225 - 235" refId="ref13181" refString="Logvinenko, B. M., Starobogatov, Y. I., 1967. K izucheniyu vidovogo sostava fauny dvustvorchatykh mollyuskov tanatotsenozov podvodnogo sklona Azerbaydzhanskogo poberezh'ya Kaspiya. [Studying the species composition of the fauna of bivalve mollusks of the tanatocenoses of the underwater slope of the Azerbaijan coast of the Caspian Sea]. In: Kudritskiy, D. M. (Ed.), Opyt Geologo-Geomorfologicheskikh i Gidrobiologicheskikh Issledovaniy Beregovoy Zony Morya. Nauka, Leningrad, pp. 225 - 235." title="K izucheniyu vidovogo sostava fauny dvustvorchatykh mollyuskov tanatotsenozov podvodnogo sklona Azerbaydzhanskogo poberezh'ya Kaspiya. [Studying the species composition of the fauna of bivalve mollusks of the tanatocenoses of the underwater slope of the Azerbaijan coast of the Caspian Sea]" type="book chapter" volumeTitle="Opyt Geologo-Geomorfologicheskikh i Gidrobiologicheskikh Issledovaniy Beregovoy Zony Morya" year="1967">Logvinenko and Starobogatov, 1967</bibRefCitation>
)
</taxonomicName>
and
<taxonomicName id="129F62A7FF92FFC9FA04BE7A7729FDD5" authority="(Logvinenko and Starobogatov, 1967)" baseAuthorityName="Logvinenko and Starobogatov" baseAuthorityYear="1967" class="Bivalvia" family="Cardiidae" genus="Monodacna" kingdom="Animalia" order="Veneroida" pageId="8" pageNumber="1235" phylum="Mollusca" rank="species" species="polymorpha">
<emphasis id="E7EBC536FF92FFC9FA04BE7A71A3FDD5" italics="true" pageId="8" pageNumber="1235">M. polymorpha</emphasis>
(
<bibRefCitation id="B10E64D5FF92FFC9FC05BE117720FDD5" author="Logvinenko, B. M. &amp; Starobogatov, Y. I." box="[950,1317,599,618]" editor="Kudritskiy, D. M." journalOrPublisher="Nauka, Leningrad" pageId="8" pageNumber="1235" pagination="225 - 235" refId="ref13181" refString="Logvinenko, B. M., Starobogatov, Y. I., 1967. K izucheniyu vidovogo sostava fauny dvustvorchatykh mollyuskov tanatotsenozov podvodnogo sklona Azerbaydzhanskogo poberezh'ya Kaspiya. [Studying the species composition of the fauna of bivalve mollusks of the tanatocenoses of the underwater slope of the Azerbaijan coast of the Caspian Sea]. In: Kudritskiy, D. M. (Ed.), Opyt Geologo-Geomorfologicheskikh i Gidrobiologicheskikh Issledovaniy Beregovoy Zony Morya. Nauka, Leningrad, pp. 225 - 235." title="K izucheniyu vidovogo sostava fauny dvustvorchatykh mollyuskov tanatotsenozov podvodnogo sklona Azerbaydzhanskogo poberezh'ya Kaspiya. [Studying the species composition of the fauna of bivalve mollusks of the tanatocenoses of the underwater slope of the Azerbaijan coast of the Caspian Sea]" type="book chapter" volumeTitle="Opyt Geologo-Geomorfologicheskikh i Gidrobiologicheskikh Issledovaniy Beregovoy Zony Morya" year="1967">Logvinenko and Starobogatov, 1967</bibRefCitation>
)
</taxonomicName>
that have been tentatively grouped into one species by
<bibRefCitation id="B10E64D5FF92FFC9FB79BE3777C4FD3B" author="Wesselingh, F. P. &amp; Neubauer, T. A. &amp; Anistratenko, V. V. &amp; Vinarski, M. V. &amp; Yanina, T. A. &amp; ter Poorten, J. J. &amp; Kijashko, P. V. &amp; Albrecht, C. &amp; Anistratenko, O. &amp; D'Hont, A. &amp; Frolov, P. &amp; Martinez Gandara, A. &amp; Gittenberger, A. &amp; Gogaladze, A. &amp; Karpinsky, M. G. &amp; Lattua, M. &amp; Popa, L. &amp; Sands, A. F. &amp; van de Velde, S. &amp; Vandendorpe, J. &amp; Wilke, T." box="[1226,1473,625,644]" journalOrPublisher="Zookeys" pageId="8" pageNumber="1235" pagination="31 - 124" part="827" refId="ref14683" refString="Wesselingh, F. P., Neubauer, T. A., Anistratenko, V. V., Vinarski, M. V., Yanina, T. A., ter Poorten, J. J., Kijashko, P. V., Albrecht, C., Anistratenko, O., D'Hont, A., Frolov, P., Martinez Gandara, A., Gittenberger, A., Gogaladze, A., Karpinsky, M. G., Lattua, M., Popa, L., Sands, A. F., van de Velde, S., Vandendorpe, J., Wilke, T., 2019. Mollusc species from the Pontocaspian region - an expert opinion list. Zookeys 827, 31 - 124. https: // doi. org / 10.3897 / zookeys. 827.31365." title="Mollusc species from the Pontocaspian region - an expert opinion list" type="journal article" year="2019">Wesselingh et al. (2019)</bibRefCitation>
.
</paragraph>
</subSubSection>
<subSubSection id="9D854AAFFF92FFC9FCE2BECC76DAFCEB" pageId="8" pageNumber="1235" type="discussion">
<paragraph id="D5201924FF92FFC9FCE2BECC76DAFCEB" blockId="8.[818,1488,181,1087]" pageId="8" pageNumber="1235">
<emphasis id="E7EBC536FF92FFC9FCE2BECC71F6FD21" box="[849,1011,650,670]" italics="true" pageId="8" pageNumber="1235">Taxonomic notes</emphasis>
Our findings of a large morphological variation in
<taxonomicName id="129F62A7FF92FFC9FCC8BEE271EEFD07" authorityName="Eichwald" authorityYear="1838" box="[891,1003,676,696]" class="Bivalvia" family="Cardiidae" genus="Monodacna" kingdom="Animalia" order="Veneroida" pageId="8" pageNumber="1235" phylum="Mollusca" rank="genus">
<emphasis id="E7EBC536FF92FFC9FCC8BEE271EEFD07" box="[891,1003,676,696]" italics="true" pageId="8" pageNumber="1235">Monodacna</emphasis>
</taxonomicName>
, with typical forms conforming to modern species but also with all kind of intermediates, either shows that (1) we are dealing with an ancestral species of all or most of the present-day Caspian
<taxonomicName id="129F62A7FF92FFC9FBBABEB476CCFCB9" box="[1033,1225,754,774]" class="Bivalvia" family="Cardiidae" genus="Monodacna" kingdom="Animalia" order="Veneroida" pageId="8" pageNumber="1235" phylum="Mollusca" rank="species" species="undetermined">
<emphasis id="E7EBC536FF92FFC9FBBABEB4767CFCB9" box="[1033,1145,754,774]" italics="true" pageId="8" pageNumber="1235">Monodacna</emphasis>
species
</taxonomicName>
or (2) that several of the present-day species should be regarded as a single species. Acombined morphological-molecular approach is required to assess the species delimitations within living faunas.
</paragraph>
</subSubSection>
<subSubSection id="9D854AAFFF92FFC9FCE2BF1C7764FBB4" pageId="8" pageNumber="1235" type="biology_ecology">
<paragraph id="D5201924FF92FFC9FCE2BF1C7764FBB4" blockId="8.[818,1488,181,1087]" pageId="8" pageNumber="1235">
<emphasis id="E7EBC536FF92FFC9FCE2BF1C719FFCD1" box="[849,922,858,878]" italics="true" pageId="8" pageNumber="1235">Ecology</emphasis>
Caspian
<taxonomicName id="129F62A7FF92FFC9FBBFBF1C76C9FCD1" box="[1036,1228,858,878]" class="Bivalvia" family="Cardiidae" genus="Monodacna" kingdom="Animalia" order="Veneroida" pageId="8" pageNumber="1235" phylum="Mollusca" rank="species" species="undetermined">
<emphasis id="E7EBC536FF92FFC9FBBFBF1C7679FCD1" box="[1036,1148,858,878]" italics="true" pageId="8" pageNumber="1235">Monodacna</emphasis>
species
</taxonomicName>
occur in a wide range of habitats today, and given the uncertainty of the identity of these species, it is difficult to report the ecological characteristics. Species live mainly in northern CS on muddy and sandy-muddy substrates at a maximum depth of
<quantity id="1267B4C1FF92FFC9FB3BBF8576BEFC68" box="[1160,1211,963,983]" metricMagnitude="1" metricUnit="m" metricValue="4.0" pageId="8" pageNumber="1235" unit="m" value="40.0">40 m</quantity>
(
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).
<taxonomicName id="129F62A7FF92FFC9FC81BF9A71F0FC4F" box="[818,1013,988,1008]" class="Bivalvia" family="Cardiidae" genus="Monodacna" kingdom="Animalia" order="Veneroida" pageId="8" pageNumber="1235" phylum="Mollusca" rank="species" species="undetermined">
<emphasis id="E7EBC536FF92FFC9FC81BF9A71A7FC4F" box="[818,930,988,1008]" italics="true" pageId="8" pageNumber="1235">Monodacna</emphasis>
species
</taxonomicName>
are filter feeders whose salinity preferences range mostly from 2 to 8 psu (
<bibRefCitation id="B10E64D5FF92FFC9FBDABFB17751FBB4" author="Bogutskaya, N. G. &amp; Kijashko, P. V. &amp; Naseka, A. M. &amp; Orlova, M. I." box="[1129,1364,1015,1035]" journalOrPublisher="KMK Scientific Press Ltd., St. Petersburg - Moscow" pageId="8" pageNumber="1235" refId="ref11824" refString="Bogutskaya, N. G., Kijashko, P. V., Naseka, A. M., Orlova, M. I., 2013. Identification keys for fish and invertebrates. Volume 1: Fish and molluscs. KMK Scientific Press Ltd., St. Petersburg - Moscow." title="Identification keys for fish and invertebrates" type="book" year="2013">Bogutskaya et al., 2013</bibRefCitation>
).
</paragraph>
</subSubSection>
</treatment>
</document>