Genus: Shastasaurus MERRIAM, 1895
Etymology: In reference to Shasta County, California where the specimen was found, and Greek, sauros, “lizard”: Shasta lizard.

Species: pacificus MERRIAM, 1895
Etymology:

Holotype: UCMP (number unknown)

Locality: Between Squay Creek and Pitt River, a few miles north of Winthrop Post Office, Shasta County, California.

Horizon: Hosselkus Formation.

Biostratigraphy:

Age: Carnian Stage, Middle Triassic Epoch, Late Triassic.

Material: 8 vertebrae with several fragments of ribs and 2 arch bones, and a pubis.

Referred material:

HILTON, 2003

Locality: Shasta County, California.

Horizon: Hosselkus Limestone.

Biostratigraphy:

Age: Carnian Stage, Lower Late Triassic Epoch, Late Triassic.

Material:

CAS: Scapula.

CAS: Scapula fragment.

UCMP 9077: Vertebrae and ribs.


= Shastasaurus osmonti MERRIAM, 1902
Etymology:

Holotype: UCMP 9076

Locality: Between Squay Creek and Pitt River, a few miles north of Winthrop Post Office, Shasta County, California.

Horizon: Hosselkus Formation.

Biostratigraphy:

Age: Carnian Stage, Middle Late Triassic Epoch, Late Triassic.

Material: 35 vertebrae and limbs.

Referred material:

MERRIAM 1908

UCMP 9608: Fragmentary skeleton.

UCMP 9081: Fragmentary skull and fragmentary skeleton.

 

ORR

Locality: Wallowa-Whitman National Forest along Eagle Creek at the intersection with Paddy Creek in the NW 1/4, sec. 21, T7S, R 44E, Wallow County, Oregon.

Horizon: Martin Bridge Limestone.

Biostratigraphy:

Age: Norian Stage, Late Triassic Epoch, Late Triassic.

Material:

Number: Not given: 23 vertebrae and associated ribs.

 

= Shastasaurus altispinus MERRIAM, 1902
Etymology: Latin, alti, "tall, high" and Latin, spinus, "spine."

Holotype: UCMP 9083

Locality: Near Cove, 3 miles from Madison's Ranch, on Squaw Creek, Shasta County, California.

Horizon: Hosselkus Formation.

Biostratigraphy:

Age: Carnian Stage, Middle Late Triassic Epoch, Late Triassic.

Material: Fragmentary skeleton.

Referred material:

CALLAWAY & MASSARE, 1989

Locality: UCMP locality 9038, El Antimonio district, 44 km west of Caborca, Sonora State, Mexico.

Horizon: Antimonio Formation.

Biostratigraphy:

Age: Late Carnian Stage, Late Triassic Epoch, Late Triassic.

Material:

UCMP 27141: Fragmented but partially well-preserved anterior skull and lower jaw with broken and complete teeth in both, indeterminate skull and jaw fragments, fragments of 3 weathered posterior dorsal vertebrae, dorsal mid-rib fragments, 1 laterally compressed partial mesopodial or metapodial element.

UCMP 27142: 1 complete cervical rib and numerous distorted rib fragments from the cervical and anterior dorsal regions, 18 crushed and greatly distorted cervical and anterior dorsal vertebrae, 2 middle dorsal vertebrae, 1 complete and 1 fragment, both weathered and distorted, 2 weathered and distorted anterior dorsal vertebrae fragments, 3 complete but slightly distorted caudal vertebrae, 5 indeterminate vertebrae fragments, 1 incomplete cervical or anterior dorsal neural arch and spine with anterior zygapophyses preserved and distorted fragments of 9 others from the cervical and anterior dorsal regions, 13 laterally compressed distal forepaddle elements.

UCMP 27146: 1 well-preserved, but laterally compressed proximal, or near-proximal, phalange from an anterior margin.

 

LUCAS & GONZALEZ-LEON, 1995

Locality: Sierra del Alamo, Northwestern Sonora State, Mexico.

Horizon: Antimonio Formation.

Biostratigraphy: Horizons, A, B, C, D and E, Dilleri zone.

Age: Upper Carnian Stage, Late Triassic Epoch, Late Triassic.

Material:

 

= Shastasaurus alexandrae MERRIAM, 1902
Etymology:

Holotype: UCMP 9017

Locality: Between Squay Creek and Pitt River, a few miles north of Winthrop Post Office, Shasta County, California.

Horizon: Hosselkus Formation.

Biostratigraphy:

Age: Carnian Stage, Middle Late Triassic Epoch, Late Triassic.

Material: Fragmentary skull, nearly all of the pectoral girdle, part of a humerus, 15 or 16 vertebrae and numerous ribs.

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Species: careyi MERRIAM, 1902
Etymology:

Holotype: UCMP 9075

Locality: Bear Mountain, 20 miles northeast of Redding, Shasta County, California.

Horizon:

Biostratigraphy:

Age: Late Triassic.

Material: Vertebrae and ribs.

Note: Shonisaurus-like.

Referred material:

UCMP 9614: Dorsal vertebrae.

 

HILTON, 2003

Locality: Shasta County, California.

Horizon: Hosselkus Limestone.

Biostratigraphy:

Age: Carnian Stage, Lower Late Triassic Epoch, Late Triassic.

Material:

UCMP 9080: Vertebra.

 

SENNIKOV, 2001/OTSCHEV & POLUKOTKO, 1964, NESOV, et al, 1988

Locality: Upper reaches of the Khivach River, a tributary of the Gizhiga River, basin of the Sea of Okhotsk, European Russia.

Horizon:

Biostratigraphy:

Age: Carnian Stage, Lower Late Triassic Epoch, Lower Late Triassic.

Material:

Number: Not given: An intervertebral cast.

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Species: ? merriami HUENE, 1916
Etymology: In honor of MERRIAM.
= Mixosaurus (?) atavus MERRIAM, 1908

Holotype:

Locality: Black Forest, Baden-Wurttemberg State, Germany.

Horizon: Wellen-Dolmit, Lower Muschelkalk.

Biostratigraphy:

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

Material: 2 centra.

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Species: sikanniensis (NICHOLLS & MANABE, 2004) SANDER, CHEN, CHANG & WANG, 2011
= Shonisaurus sikanniensis NICHOLLS & MANABE, 2004
Etymology: In reference to the Sikanni Chief River in northeastern British Columbia, Canada, where the specimen was collected.

Holotype: RTMP 94.378.2

Locality: Southwest bank of Sikanni Chief River, 1.5 km downstream from the mouth of Chicken Creek, 57°15.81'N, 123°00.92'W, northeastern British Columbia Province, Canada.

Horizon: Pardonet Formation.

Biostratigraphy: Epigondolella posteraconodont zone, Mesohemavatites columbianus ammonite zone.

Age: Middle Norian, Late Triassic Epoch, Late Triassic.

Material: Incomplete skull and articulated skeleton.