Species: nevadanus MERRIAM, 1906
Etymology: In reference to the state of Nevada, where the specimen was found.

Holotype: UCMP 8121

Locality: South fork of American Canyon, Humboldt County, Pershing County, Nevada.

Horizon: Cymbospondylus beds.

Biostratigraphy:

Age: Anisian Stage, Lower Middle Triassic Epoch, Middle Triassic.

Material: Fragmentary skull.

After Mazin, 1986.

Referred material:

= Omphalosaurus cf. O. nevadanus (TICHY, 1995) SANDER & FABER, 2003
= Omphalosaurus wolfi TICHY, 1995
Etymology: In honor of Mr. G. Wolf of Hallein.

Holotype: MBG 1500

Locality: Durrnberg Mountain near Hallein about 15 km S of Salzburg, near Austin City, but not on German Territory, Salzburg State, Austria, Northern Alps.

Horizon: Lercheck Limestone, Hallstatt Faces.

Biostratigraphy:

Age: Ladinian Stage, Upper Middle Triassic, Middle Triassic.

Material: Fragmentary skull and fragmentary skeleton.

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Species: merriami MAISCH, 2010
Etymology: In honor of Prof. Dr. John C. Merriam of the University of Berkeley, one of the most important ichthyosaur researchers of all time, who also was the first ot recognized the omphalosaurid nature of the material in question.

Holotype:

Locality: Middlehook, Isford, Spitzbergen, Svalbard Island, Norway.

Horizon: Upper Sticky Keep Formation, Lower Saurian Niveau.

Biostratigraphy:

Age: Olenekian, Upper Spathian Stage, Upper Scythian Epoch, Early Triassic.

Material:

= Omphalosaurus nisseri (WIMAN, 1910) (partim)
= Pessopteryx nisseri WIMAN, 1910 (partim)

Non type, referred material:

Locality: Isfjord, Spitzbergen, Svalbard Island, Norway.

Horizon:

Biostratigraphy:

Age: Late Triassic.

Material: Fragmentary skull and fragmentary skeleton.

Referred material:

MAZIN, 1983

Locality: Mont Ibsen, Dickson Land, Spitsbergen, Svalbard Island, Norway.

Horizon:

Biostratigraphy:

Age: Spathian Stage, Uppermost Scythian Epoch, Late Early Triassic.

Material:

SVT 207, 214, 213, 205, 203, SVT 215: Fragmentary dentaries.

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Species: nettarhynchus MAZIN & BUCHER, 1987
Etymology:

Holotype: MGL 45452

Locality: Between Coyote Canyon and Bloddy Canyon, 350 west of the locality M 2360, USGS, sector 2, T. 31N, R. 34E, Humboldt Range, Pershing County, Nevada.

Horizon: Lower Member, Prida Formation.

Biostratigraphy: Prohungarites and Subcolumbites zones.

Age: Spathian Stage, Uppermost Scythian Epoch, Late Early Triassic.

Material: Fragment of mandibular symphysis.