Genus: Utatsusaurus SHIKOMA, KAMEI & MURATA, 1978
Etymology: In reference to Utatsu-cho, Tatezaki Coast, Northeast Hanshu, Yoroijima Island, Japan where the specimen was found, and Greek, sauros, “lizard”: Utatsu-cho lizard.

Species: hataii (SHIKOMA, 1978) SHIKOMA, KAMEI & MURATA, 1978
Etymology:
= Utatsusaurus hataii SHIKOMA, 1978
= Grippia hataii (SHIKOMA, 1978)

Holotype: No. K1, IGPS 95941

Locality: Cost of Tatezaki, Utatsu-cho, Motoyoshi-gun, Miyagi Prefecture, Kitakami Massif, Yoroijima Island, Northeast Japan.

Horizon: Osawa Formation.

Biostratigraphy:

Age: Spathian in Stage, Upper Scythian Epoch, Late Early Triassic.

Material: Fragmentary skull and fragmentary skeleton.

Referred material:

No. K2, IGPS 95942: Ventral side of skull with lower jaw, left side of thoracic region, dorsal side of right fore limb and part of left fore limb and vertebrate column.

No. E, IGPS 95943: Right side of posterior portion of vertebrae column.

No. F, Educational Committee of Utatsu-cho, Miyagi Prefecture: 5 joined vertebrae and costae, 7 vertebrae showing their left side, and 5 or more detached costae from column.

No. G, Natural Monument of Japan: Undislocated anterior vertebrate column showing right side of about 16 vertebrae.

No. I, KUHM Reg. No. 93001: Imperfect specimen of dentary bone.

No. J, KUJM Reg. No. 93002: Lower jaws of both sides and vertebrae column of 5 vertebrae, 14 detached costae and a portion of both fore limbs of both coracoids and scapulas, left ulna and left radius, left carpal and metacarpal bones.

No. L, IGPS 95944: Left side of caudal region, 23 caudal vertebrae, neural spines.

No. M, GIYNU Reg M106: 14 costae and vertebrae.

No. N, GIYNU Reg M107: Neural spines of vertebrae.

No. O, IGPS 95945: A right costa, a right humerus and probably a left humerus.

No. P, IGPS 95946: A caudal vertebra.

No. Q, GIYNU M108: Orbital region of skull.

 

MINOURA, ONO, KAMADA, KATO TAKAHASHI, KATO & KAWAKAMI, 1993, MONTANI, MINOURA & ANDO, 1998

Locality: 20 km south of the type locality, Ogatsu, Miyagi Prefecture, Kitakami Massif, Yoroijima Island, Japan.

Horizon: Osawa Formation.

Biostratigraphy:

Age: Spathian in Stage, Upper Scythian Epoch, Late Early Triassic.

Material:

Specimen 1, Hokkaido university, UHR 3069: Fragmentary skull and fragmentary skeleton.

Specimen 2, National Science Museum, NSM-VP-20028: Fragmentary skull.


= Grippia microdenta MINOURA, 1994
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