Species: orientalis COPE, 1868 (nomen dubium)
Etymology:
= Discosaurus orientalis (COPE, 1868) LEIDY, 1870 (nomen dubium)

Holotype: AMNH 1409

Locality: Swedesboro, Gloucester County, New Jersey.

Horizon: Marshalltown Formation, Matawan Group.

Biostratigraphy:

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

Material: 12 fragmentary cervical vertebrae.
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Species: helmersenii (KIPRIJANOFF, 1882) PERSSON, 1960 (nomen dubium)
Etymology:
= Plesiosaurus helmersenii KIPRIJANOFF, 1882 (nomen dubium)

Holotype: Museum of the Academy of Science, Leningrad, ZIN
Locality: Serdoba, Penza Region (Petrov region), Saratov, Russia (old Gumbinnen, Prussia.)

Horizon:

Biostratigraphy:

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

Material: Cervical centra.

Referred material:

Locality: Ignaberg, Skane (Scania) Province, Sweden.

Horizon:

Biostratigraphy:

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

Material:

Number: Not given: Vertebrae.

 

Locality: Maloje Serdoba (the oblast of Saratov), European Russia.

Horizon:

Biostratigraphy:

Age: Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material:

Number: Not given: Vertebrae and limb bones.

 

PERSSON, 1959

Locality: Blaksudden, Ivo Island, Skane (Scania) Province, Sweden.

Horizon:

Biostratigraphy:

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

Material:

RM R 991: Centra.

 

SCHROEDER, 1885

Locality: Old Prussia.

Horizon:

Biostratigraphy:

Age: Late Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material:

Konigl. Mineralogy. Universitats-Musuem zu Konigsberg: Dorsal vertebrae.

Geologisches Musum zu Lund : Sacral vertebrae.

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Species: sternbergi WILLISTON, 1906 (nomen dubium)
Etymology:

Referred material only: KUMNH 1302

Locality: Gove County, Kansas.

Horizon: Niobrara Formation.

Biostratigraphy:

Age: Late Cretaceous.

Material: 2 dorsal vertebrae and additional fragments.
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Species: nobilis WILLISTON, 1906 (nomen dubium)
Etymology:
= Thalassonomosaurus nobilis (WILLISTON, 1906) (nomen dubium)

Holotype: YPM 1640

Locality: 1.8 km west of Jewell City, Jewell County, Kansas.

Horizon: Fort Hays limestone Member, Lower Niobrara Formation.

Biostratigraphy:

Age: Coniacian Stage, Lowest Senonian Subepoch, Middle Gulf Epoch, Late Cretaceous.

Material: 27 vertebrae from throughout the column, some complete but most preserved as isolated centra or partial centra, plus associated spine and other vertebral fragments, numerous rib fragments, the right scapula minus the dorsal process, the posterior flange of a coracoid, both ilia, numerous small additional portions of the pectoral and pelvic girdles, right femur and parts of the other propodials, epipodials, mesopodials, metapodials and phalanges of a small individual (possibly not a juvenile).
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Species: kurskensis BOGOLOBOV, 1911 (nomen dubium)
Etymology:
= Plesiosaurus helmersenii KIPRIJANOFF, 1883 (referred material)

Holotype: MGRI

Locality: Kursak, Kursk Region, European Russia.

Horizon:

Biostratigraphy:

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

Material: Vertebrae.
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Species: orskensis BOGOLOBOV, 1911 (nomen dubium)
Etymology:

Holotype: MGRI

Locality: Konoplianki, Orsak, Orenburg Region, European Russia.

Horizon:

Biostratigraphy:

Age: Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: Cervical centra.
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Species: serdobensis BOGOLOBOV, 1911 (nomen dubium)
Etymology:

Holotype: MGRI

Locality: Serdoba, Petrovsk, Penza region, European Russia.

Horizon:

Biostratigraphy:

Age: Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: Anterior cervical.

Referred material:

PERSSON

Locality: Maloje Serdoba (The oblast Saratov), European Russia.

Horizon:

Biostratigraphy:

Age: Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material:

Number: Not given: Vertebrae.

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Species: ?sachaliensis RYABININ, 1915 (nomen dubium)
Etymology:

Holotype:

Locality: Sakhalin Island, Asian Russia.

Horizon:

Biostratigraphy:

Age: Lower Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: Phalanx.

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Species: amalitskii PRAVOSLAVLEV, 1916 (nomen dubium)
Etymology:

Holotype:

Locality: Liski River, Don Province, European Russia.

Horizon:

Biostratigraphy:

Age: Turonian Stage, Upper Gallic Subepoch, Lower Gulf Epoch, Late Cretaceous.

Material: Vertebrae.
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Species: antiquus DDUBEIKOVSKII & OCHEV, 1967 (nomen dubium)
Etymology:

Holtoype: SGU 104a/17,18,19

Locality: Kama River Basin, Kostroma Region, European Russia.

Horizon:

Biostratigraphy:

Age: Hauterivian Stage, Upper Neocomian Subepoch, Early Cretaceous Epoch, Early Early Cretaceous.

Material: Cervical centra.