New species of bivalves of the genus Lopatinia (Arcoidea, Cucullaeidae) from the Upper Jurassic of Northern Siberia

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Resumo

New species Lopatinia (Lopatinia) prima sp. nov. has been described from the upper Oxfordian – lower Kimmeridgian deposits of Northern Siberia (Anabar River basin). The diagnosis of the genus Lopatinia as well as its stratigraphic and palaeobiogeographic distribution have been clarified. The boreal basins of Europe (most likely, the Russian Sea) were the center of the origin of the genus. Later, representatives of the genus spread to the Arctic basins as well as to the Southern hemisphere in the Notal Superrealm. Already in the early Kimmeridgian the genus Lopatinia had a bipolar distribution.

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Sobre autores

I. Kosenko

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences

Autor responsável pela correspondência
Email: KosenkoIN@ipgg.sbras.ru
Rússia, Novosibirsk, 630090

B. Nikitenko

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences

Email: KosenkoIN@ipgg.sbras.ru
Rússia, Novosibirsk, 630090

S. Khafaeva

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences

Email: KosenkoIN@ipgg.sbras.ru
Rússia, Novosibirsk, 630090

A. Yadrenkin

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences

Email: KosenkoIN@ipgg.sbras.ru
Rússia, Novosibirsk, 630090

A. Popov

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences

Email: KosenkoIN@ipgg.sbras.ru
Rússia, Novosibirsk, 630090

Bibliografia

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2. Fig. 1. Geographical location of the studied Lopatinia shells.

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3. Fig. 2. Biolithostratigraphic subdivision of the well 40/16 section, Dogoi-Kuoi area.

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4. Fig. 3. Boreal zonal standard and zonal scales for bivalves and foraminifers for the Oxfordian and Kimmeridgian stages of the northern Asian part of Russia (after: Nikitenko et al., 2013, 2023). The stratigraphic interval of Lopatinia prima sp. nov. finds is highlighted in grey.

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5. Fig. 4. Measurement scheme of Lopatinia prima sp. nov. shells (×4) (a): D – shell length, H – shell height, AL – length of the anterior part of the shell, Ua – area height, K – umbo height, La – area length, α – umbo angle; b – graph of shell length versus shell height; c – histogram of shell length distribution; g – histogram of the distribution of the H/L coefficient (the ratio of shell height to length); d – histogram of the distribution of the AL/L coefficient (the ratio of the anterior part length to shell length); e – histogram of the distribution of the convexity coefficient T/H (the ratio of shell convexity to height).

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6. Table VII

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7. Table VIII

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8. Fig. 5. Paleobiogeographical distribution of representatives of the genus Lopatinia in the Late Jurassic. Paleogeographic basis for the Kimmeridgian from (Scotese, 2014): 1 – L. (L.) callomoni, East Greenland, Upper Oxfordian (Aldinger Elv Member) (Fürsich, 1982); 2 – L. (P.) sortlandensis, Northern Norway, Volgian Stage (Fürsich, Thomsen, 2005); 3 – L. (P.) pectunculoides, Russian Platform, Callovian (Trautschold, 1861; Sanin et al., 1984); 4 – L. (L.) petschorae, Pechora Basin, Upper Jurassic (Keyserling, 1846; Sanin et al., 1984); 5 – L. (P.) pectunculoides, Subpolar Urals, lower Kimmeridgian (Sanin et al., 1984); 6 – L. (L.) prima sp. nov., upper Oxfordian–lower Kimmeridgian, northern Central Siberia (this work), L. (L.) woodsi, northern Central Siberia, lower Volgian substage (Sanin et al., 1984), L. (L.) taimyrensis, northern Central Siberia, middle and upper Volgian substages (Sanin et al., 1984); 7 – L. (L.) arctica (?), Chukotka, middle and upper Volgian substages (Paraketsov, 1991); 8 – L. (L.) proclivia, New Zealand, lower Kimmeridgian (Gardner, 2005).

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