Species: hesternus LUCAS, 1904
Etymology:
Holotype: USNM 2198
Locality: Ward’s Bonebed, 3 miles north of Tanners Crossing of the Little Colorado River, Petrified Forest, Apache County, Arizona.
Horizon: Lower Petrified Forest Formation, Chinle Group.
Biostratigraphy:
Age: Late Carnian Stage, Lower Late Triassic Epoch, Late Triassic.
Material: Right humerus.
Topotype: MNA V 8464
Locality: MNA Locality 1454, along Ward’s Terrace, east of Cameron and
just north of Landmark Wash at UTM Zone 12, 472000E, 3964620N, Apachae County,
Arizona.
Note: Found near the type specimen.
Horizon: Lower Petrified Forest Formation, Chinle Group.
Biostratigraphy:
Age: Late Carnian Stage, Lower Late Triassic Epoch, Late Triassic.
Material: Maxillary, orbital region and squamosal region, especially of the left side. (LUCAS, HECKERT & ESTEP, 1999, LUCAS & HECKERT, 2002)
Referred material:
CAMP & WELLES, 1956
UCMP V3309: Fragment of a small squamosal.
UCMP V4121: Fragmentary scapula.
HUBER, LUCAS & HUNT, 1993, LUCAS, 1998
Locality: Pomona Pipe Products Pit, Gulf, Deep River Basin, Wadesboro sub-basin, North Carolina.
Horizon: Middle Pekin Formation, Chatham Group.
Biostratigraphy:
Age: Late Triassic.
Material:
AMNH 2848, 2854, 2853, 2857, 2859, 2863, 2864, 2868, 24112: Assorted vertebrae.
AMNH 2849, 2850,2851, 24142, 24125: Ribs and rib fragments.
AMNH 24118, 24119: Humerus fragments.
AMNH 24126-24137, 2845-2847: Bone fragments.
AMNH 2852: Partial articular.
AMNH 2855: Distal end of tibia.
AMNH 2856: Scapula fragment.
AMNH 2858: Left articular.
AMNH 2859: Vertebrael fragments.
AMNH 2860: Proximal part of a femur.
AMNH 2861: Sacral vertebrae.
AMNH 2866: Left femur.
AMNH 2867: Shaft of left humerus.
AMNH 2869: Partial quadrate.
AMNH 2871: Incomplete squamosal.
AMNH 2872: Right maxillary.
AMNH 2873: Left squamosal.
AMNH 2874, 2876: Fragments of left humeral shaft.
AMNH 2875: Fragment femoral shaft.
AMNH 2877: Partial left radius.
AMNH 2878: Shaft of right humerus.
AMNH 2879: Phalanx.
AMNH 2880: Distal end of right humerus.
AMNH 2881: Left maxillary.
AMNH 2883: Left articular.
AMNH 2884: Left quadrate.
AMNH 2885: Portion of occupit.
AMNH 2886: partial occipital plate.
AMNH 24114: Left maxillary fragment.
AMNH 24115: Metopodial.
AMNH 24116: Squamosal fragment.
AMNH 24117: Preparietal.
AMNH 24120: Distal end of radius.
AMNH 24121: Proximal end of right radius.
BAIRD & PATTERSON, III, 1968
Number: Not given: Teeth.
= Placerias gigas CAMP & WELLES, 1956
Etymology:Holotype: UCMP 27553 (A269)MX
Locality: UCMP loc A269, the Placerias quarry, in a small valley 6 1/2 miles 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: Right maxillary.
Referred material:
UCMP 24547, 25324, 32409, 32415 C4, 32437, 32438, 27632, 27665, 27636, 27674, 27675: Postorbitals.
UCMP 24561, 24589, 32416: Jugals.
UCMP 24633, 24642, 24657, 24675, 32401: Quadrates.
UCMP 24644, 24650, 24653, 24654, 24674, 24680, 25332, 32400: Stapes.
UCMP 24711: Articular.
UCMP 24713: Prearticular.
UCMP 24739, 24741: Dentaries.
UCMP 24746, 24761, 24762, 24766, 32404: Splenals.
UCMP 24781, 24782, 24783, 24810, 24817, 24826: Scapula.
UCMP 24823, 24824, 25444, 25446, 25447, 25448: Pubes.
UCMP 24852, 25429, 25431, 25432, 25952, 25953, 32442: Ulnae.
UCMP 24859, 26682, 32445: Radii.
Note: UCMP 32445 has tooth marks.UCMP 24864, 24865, 24866, 24868, 24871, 24872, 32447: Tibiae.
UCMP 24875, 24876, 24878, 24882, 24883, 24890, 32446: Fibulae.
UCMP 24894, 24926, 27994, 27995, 27999: Mesopodials.
UCMP 24927, 25043, 25471: Phalanages.
UCMP 24951, 24959, 25007: Metapodials.
UCMP 25055, 25454, 32394: Femora.
UCMP 25064, 25069, 25096, 32159, 32393: Ilia.
UCMP 25087, 25093, 25094: Ischia.
UCMP 25100, 25129, 25132, 25136, 25148, 25157, 25267, 25268, 25269, 25274, 25280, 25281, 25286: Fragmentary vertebrae.
UCMP 25146: Fragmentary cervical vertebrae.
UCMP 25295: Vertebra.
UCMP 25316, 27353, 27360, 27830: Premaxillae.
UCMP 25317, 27318, 27319, 27550, 27551, 32389: Maxillae of a male.
UCMP 25346: Dorsal rib head.
UCMP 25361, 32459, 32460: Humeri.
UCMP 25442, 27699, 27709, 27712, 27720: Preparietals.
UCMP 25443: Preparietal and ulna.
UCMP 25588: Dorsal neural spine.
UCMP 25602: Cervical neural spine.
UCMP 26674, 27702, 28383, 28384, 28399: Frontals.
UCMP 26679: Parietal.
UCMP 26680, 27891, 27892, 28372, 32398: Supraocciptial, parocciptual and prootic segments.
UCMP 27532: Dorsal vertebra.
UCMP 27539, 27541, 27546, 27552, 27555, 28391, 28398: Maxillae of a female.
UCMP 27553: Left and right maxillae of a male.
UCMP 27565, 27947, 32414: Lachrymals.
UCMP 27619, 28396: Postfrontals.
UCMP 27704: Frontal, parietal.
UCMP 27721: Interparietal.
UCMP 27737, 27738, 27766, 27777, 32395, 32441: Squamosals.
UCMP 27924, 27925: Basiphenoids.UCMP 27936, 27937: Supraoccipitals.
UCMP 28341: Surangular.
UCMP 28363, 28364: Quadratojugals.
UCMP 32402, 32403: Preparietals.
UCMP 32405: Angular.
UCMP 32410: Interparietal?
UCMP 32411: Interclavicle?
UCMP 32412: Basiocciptal.
UCMP 32420: Postfrontal?
UCMP 32448: Sternum.
UCMP 32454: Pubis of a juvenile.
UCMP 32458: Supraoccipital, basiociptal.
C62, CH2: Fragmentary skulls.
In addition to LONG & MURRY, 1995
MNA collections
MNA Pl. 2753: Left quadrate.
MNA Pl. 2769: Left articular.
MNA Pl. 2770: Squamosal fragment.
MNA Pl. 2950: Right jugal.
MNA Pl. 2951: Right jugal.
MNA Pl. 2986: Cervical centrum.
MNA Pl. 2981: Caudal vertebra.
MNA Pl. 3031: Neural arch.
MNA Pl. 2714B: Right humerus (same individual as MNA Pl. 2714A).
MNA Pl. 2878: Right humerus in 2 pieces.
MNA Pl. 2714A: Right ulna.
MNA Pl. 2713: Right femur.
MNA Pl. 2820: Ungual.
MNA Pl. 3011: Ungual phalange.
MNA Pl. 3023: Phalange.