Species: macdowelli GAFFNEY, 1975
Etymology:

Holotype: NHMUK (old BMNH) R2914

Locality: Isle of Portland, Dorset County, England, Southern United Kingdom.

Horizon: Portland.

Biostratigraphy:

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

Material: Fragmentary skull.

Referred material:

BMNH R 3163: Disarticulated partial skull.

BMNH R3164: Fragmentary skull.

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Species: gracilis ANQUETIN, PÜNTENER, & BILLION-BYRANT, 2015
Etymology: Latin, gracilis, "slender"; in reference to the gracile morphology of this taxon compared to that of the type species, Portlandemys mcdowelli.

Holotype: MJSN BSY009-708

Locality: Bois de Sylleux, Courtedoux, near Porrentruy, Switzerland.

Horizon: Chevenez Member, Reuchenette Formation.

Biostratigraphy: Lower Virgula Marls.

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

Material: Fragmentary skull.

Referred material:

MJSN SCR011-441: A complete mandible.