Genus: Mixosaurus BAUR, 1887
Etymology: Greek, mixis, “mixture”, and Greek, sauros, “lizard”: Mixture lizard.

Species: cornalianus (BASSANI, 1886) BAUR, 1887
Etymology:

Referred material:

RENESTO, DAL SASSO, FOGLIAZZA & RAGNI, 2020

Locality: Sasso Caldo Site, 45°54'03.7"N, 8°55'10.6"W, Besano, Lombardia, Varese Province, Italy.

Horizon: Besano Formation.

Biostratigraphy: Nevadites secedensis zone.

Age: Uppermost Anisian Stage, Late Early Mid Triassic Epoch, Early Middle Triassic.

Material:

BES SC 1000, 1001: 2 nearly complete specimens.

Note: Soft tissue preserved showing it had a dorsal fin.

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Species: (?)hectori LYDEKKER, 1889
Etymology:

Referred material:

FLMING, GREGG & WELLES

Locality: Mount Potts Rocky Gully, Ashburton County, South Island, New Zealand.

Horizon:

Biostratigraphy:

Age: Late Triassic.

Material:

McKAY 1877

Number: Not given: Vertebrae, ribs and a possible humerus, and a dermal scute?