Species: mccreai LONG & MURRY, 1995
Etymology: In honor of Roderick T. McCrea, for his dedication in illustrating many of the fossil specimens for this study.

Holotype: UCMP A269/139623

Locality: Placerias quarry (UCMP A269, MNA 207C), Big Hollow Wash near Romero Springs, a small valley 6 1/2 miles (approximately 10.4 km) S 65"W of St. Johns, Apache County, Arizona. (Located 0.3 miles northwest of Romero Springs at approximately Long. 109'28'W and lat. 34"27'N on the USGS St. Johns quadrangle of 1921.)

Horizon: Bluewater Creek Formation, Lower Chinle Group.

Biostratigraphy:

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

Material: Anterior cervical centrum.

Referred material:

UCMP A269/139624: Anterior cervical centrum.

UCMP A269/139625: Posterior cervical centrum or anterior dorsal centrum.

UCMP A269/139627A, 139626: Anterior- to mid-dorsal centra.

UCMP A269/139627: Mid- to posterior dorsal centrum.

UCMP A269/139629: First sacral centrum.

UCMP A269/139630: Second sacral centrum.

MNA Pl. 2708, 2991, 3009: Cervical centra.

MNA V3713, V3049: Posterior dorsal centra.

MNA V3666: Sacral centrum.

 

Locality: Downs Quarry (MNA Loc. 207N), approximately 72 m east of Placerias Quarry, Big Hollow Wash near Romero Spring, approximately 10.4 km southwest of St. Johns, Apache County, Arizona.

Horizon: Lower Petrified Forest Formation, Chinle Group.

Biostratigraphy:

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

Material:

MNA Pl. 2708, 3081, 3125: Cervical centra.

MNA Pl.3071, 3073, 3079: Dorsal centra.

MNA Pl. 2445: Posterior dorsal vertebra.

MNA Pl. 2746: Sacral vertebra.

 

 

Locality: Big Hollow Wash S (UCMP V80003), Petrified Forest, Apache County, Arizona.

Horizon: Lower Petrified Forest Formation, Chinle Group.

Biostratigraphy:

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

Material:

UCMP: 2 cervical centra.

 

 

Locality: Blue Hills 1 (UCMP 7307 and 7308), Petrified Forest, Apache County, Arizona.

Horizon: Lower Petrified Forest Formation, Chinle Group.

Biostratigraphy:

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

Material:

UCMP: Cervical centrum.

 

Locality: Phytosaur Basin of C. L Camp., PEFO 085023 (UCMP V7039, MNA 302:101, PF120), in Blue Mesa W Area, NW 1/4 of SE 1/4, Sec. 26, T 18N, R 24 E, Petrified Forest, Apache County, Arizona.

Horizon: Lower Petrified Forest Formation, Chinle Group.

Biostratigraphy:

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

Material:

UCMP 125539: Cervical centra.

 

Locality: Canada Colorado, 4 km east of Lamy, Santa Fe County, New Mexico.

Horizon: Los Esteros Member, Santa Rosa Formation.

Biostratigraphy:

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

Material:

UNM: Series of cervical and dorsal centra.

 

Locality: “Buettneria Hole”, south of Cedar Mountain, Crosby County, Texas.

Horizon: Tecovas Formation, Dockum Group.

Biostratigraphy:

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

Material:

UMMP 10193: Cervical centrum.

 

HUNT & LUCAS, 1995

Locality: NMMNH locality 149, NW 1/4, SW 1/4, SE 1/4, sec. 2, T14N, R10E, Santa Fe County, New Mexico.

Horizon: Los Esteros Member, Santa Rosa Formation.

Biostratigraphy:

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

Material:

NMMNH P-3014, P3015: Vertebral centra.

 

PARKER & IRIMIS, 2005

Locality: PFV 261, Petrified Forest National Monument, Apache County, Arizona.

Horizon: Blue Mesa Member,Petrified Forest Member, Chinle Group.

Biostratigraphy:

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

Material:

PEFO 26681: Partial postcranial skeleton.