Species: brachistospondylus (HULKE, 1870) LYDEKKER, 1889 (misspelling of Cimoliasaurus nomen dubium)
Etymology:
= Plesiosaurus brachistospondylus HULKE, 1870 (nomen dubium)

Holotype: BMNH 45869

Locality: Kimmeridge Bay, Gaulter Gap-Broad Bench, Dorset County, England, Southern United Kingdom.

Horizon: Kimmeridge Clay.

Biostratigraphy:

Age: Early Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material: A phalanx, a carpal or tarsal, rib fragments and 5 axially-compressed dorsal vertebrae.

Referred material:

PERSSON

Locality: Pljos, oblast of Kostroma, European Russia.

Horizon: Portlandian, Late Jurassic.

Biostratigraphy:

Age: Middle Tithonian, Upper Malm Epoch, Late Jurassic.

Number: Not given: Vertebrae

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Species: dutertrei SAUVAGE 1879 (nomen dubium)
Etymology:

Holotype:

Locality: Boulogne-sur-mer, Pas-de-Calais Department, France.

Horizon:

Biostratigraphy:

Age: Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material: Vertebrae.
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Species: sklerodirus BOGOLUBOV, 1912 (nomen dubium)
Etymology:

Holotype: MGRI

Locality: Vorobjovy Gory, Moscow Basin, European Russia.

Horizon: Volgian, Portlandian.

Biostratigraphy:

Age: Middle Tithonian, Upper Malm Epoch, Late Jurassic.

Material: Vertebrae and limb bones.