Genus: Polycotylus non COPE, 1869

Species: brevispondylus BOGOLOBOV, 1911(nomen dubium)
Etymology:

Holotype: MGRI

Locality: Unknown, European Russia.

Horizon:

Biostratigraphy:

Age: Cenomanian Stage, Upper Middle Gallic Subepoch, Lowermost Gulf Epoch, Middle Cretaceous.

Material: Pectoral vertebra.
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Species: epiguritis BOGOLOBOV, 1911(nomen dubium)
Etymology:

Holotype: MGRI

Locality: Voronezh Region (Voronezhskaia), European Russia.

Horizon:

Biostratigraphy:

Age: Cenomanian Stage, Upper Middle Gallic Subepoch, Lowermost Gulf Epoch, Middle Cretaceous.

Material: Posterior dorsal centrum.
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Species: ichthyospondylus tanais BOGOLOBOV, 1911(nomen dubium)
Etymology:
= Plesiosaurus ichthyospondylus tanais (BOGOLOBOV, 1911) (nomen dubium)
= Trinacromerum ichthyospondylus tanais (BOGOLOBOV, 1911) (nomen dubium)

Holotype: MGRI

Locality: Voronezh Region (Voronezhskaia), European Russia.

Horizon:

Biostratigraphy:

Age: Cenomanian Stage, Upper Middle Gallic Subepoch, Lowermost Gulf Epoch, Middle Cretaceous.

Material: Posterior cervical and propodial.
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Species: orientalis BOGOLOBOV, 1911(nomen dubium)
Etymology:
= Trinacromerum orientalis (BOGOLOBOV, 1911) (nomen dubium)
= Plesiosaurus ichthyspondylus SCHRODER, 1885 non SEELEY, 1869 (nomen dubium)

Holotype: MGRI (Sa109, 110 etc.)

Locality: Orenburg Region, European Russia (old Rosenberg, Prussia.)

Horizon:

Biostratigraphy:

Age: Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: Centra and limb fragments.
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Species: ultimus BOGOLOBOV, 1911(nomen dubium)
Etymology:

Holotype: MGRI

Locality: Petrovsk, Oblast of Saratov, Penza Region, European Russia.

Horizon:

Biostratigraphy:

Age: Campanian Stage, Upper Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: 2 cervical centra.
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Species: donicus PRAVOSLAVLEV, 1915 (nomen dubium)
Etymology:

Holotype:

Locality: Llysoff farm, north of Don District, European Russia.

Horizon:

Biostratigraphy:

Age: Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: Pubis and cervical centra.