Holotype: UCMP 63845
Locality: Quarry 2 of J. T. Gregory, (YPM locality 6649, UCMP locality 6148, NMMNH locality 485), NE 1/4, NE 1/4, NW 1/4 Section 3, T8N, R33E, Apache Canyon, Quay County, New Mexico.
Horizon: Lower Duke Ranch Member, Upper Redonda Formation, Chinle Group.
Biostratigraphy: Apachean characteristic assemblage.
Age: Apachean, Rhaetian, Late Norian Stage, Late Triassic Epoch, Late Late Triassic.
Material: A nearly complete skull.
Paratype:
UCMP 63846: Skull roof impression.
UCMP 63847: Right mandible.
UCMP 63848: Right mandible fragment.
UCMP 63849: Interclavicle.
UCMP 63850: Clavicle fragment.
UCMP 63854: Interclavicle fragment.
UCMP 65312: Vertebra.
UCMP 65313: Skull roof fragment.
UCMP 65328, 65417, 65418, 65550: Centra.
Referred material:
UCMP 4212, UPM 4217: Ilia.
UCMP 53001, YPM 4214-4216, 4219: Limb bones.
UCMP 63832: Skull roof fragment.
UCMP 63046: Left posterior skull fragment.
UCMP 63047, 66540, 65529: Lower jaw fragments.
UCMP 63851: Clavical fragment.
UCMP 63852: Postorbital fragment.
UCMP 63853: Interclavical fragment.
UCMP 63856, 65545, YPM 4217: Ribs.
UCMP 65329: Clavical and interclavicle.
UCMP 65550, NMMNH 17062: Centra.
NMMNH 16948: Left posterior skull fragment.
YPM uncatalogued: Clavicle fragment.
SPIELMANN, & LUCAS, 2012
NMNNH P-4745: Clavicle fragment.
NMMNH P-4753: Intercentrum.
NMMNH P-4755: Skull fragments.
NMMNH P-4764: Lower jaw fragment.
NMMNH P-7104: 28 pectoral adn skull fragments.
NMMNH P-7105: Centrum.
NMMNH P-16948: 2 skull fragments.
NMMNH P-17062: 5 vertebrae.
NMMNH P-25674: Rib fragment.
NMMNH P-25675: Clavical fragment.
NMMNH P-37069: Right rear quadrant of skull.
NMMNH P-39297: 7 interclavical fragments.
YPM, 4201: Right side of skull.
YPM 4202, 4204, -4207, 4209--4333, 4238, 42844303, and 9628: Incomplete left clavicle.
NMMNH P-37069: Posteriorright portion of skull.
NMMNH P-16948: Posterior left portion of skull.
NMMNH P-40503: Left clavicle.
NMMNH P-4764: Right lower jaw.
Locality: Bull Canyon, Sec. 2-021, 27-29, and 32-33, T9N, R26E, and sec. 10, T9N, R26E, Guadeloupe County, New Mexico.
Horizon: Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
Number: Not given:
Locality: NMMNH locality 1, Revuelto Creek, Secs. 9-10, 14-16, and 21-22, T10N, R33E, Quay County, New Mexico.
Horizon: Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
NMMNH 16901: Nearly complete skull.
NMMNH 4669: Lower jaw fragments.
NMMNH 4589, 4670, 4855, 17491: Centra.
NMMNH P-4670, P-16604: Intercentra.
LONG & MURRY, 1995.
NMMNH P4667: Numerous skull fragments.
NMMNH P4668: Numerous clavicle and interclavicle fragments.
NMMNH P6770: 26 centra.
NMMNH P16604: 6 centra.
Locality: Lacey Point, Petrified Forest, Apache County, Arizona.Horizon: Painted Desert Member, Petrified Forest Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
UCMP 82/39/37: Skull.
Locality: Crosby County, Texas.Horizon: Tecovas Member, Dockum Formation.
Biostratigraphy:Age: Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
TTUP 9237: Posterior portion margin of skull.
Locality: Miller Quarry (Post Quarry),(TUPP, DMNH Locality 1160), 2 km due south of Cooper Creek on the R. C. Miller's Ranch, 8 km southeast of Post, Lat. 33°31’17”N, Long. 101°18’54"W, 9 miles southeast of Post Garza County, West Texas.
Horizon: Cooper Member, Dockum Formation.
Biostratigraphy:
Age: Carnian Stage, Middle Late Triassic Epoch, Late Triassic.
Material:
LONG & MURRY, 1995
TTUP 9216: Skull and jaws of a small individual.
Note: “small metopsaurid” of DAVIDOW-HENRY, 1989.
GEE, PARKER & MARSH, 2017
Locality: Locality PFV 122, Petrified Forest, Apache County, Arizona.
Horizon: Blue Mesa Member, Lower Petrified Forest Formation, Chinle Group.
Biostratigraphy:
Age: Latest Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
PEFO, 36874a: Intra centra.
Locality: Locality PFV 215, Petrified Forest, Apache County, Arizona.
Horizon: Petrified Forest Formation, Chinle Group.
Biostratigraphy:
Age: Latest Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
PEFO 16696a: 3 intracentra.
HECERT, LUCAS & HUNT, 2005
Locality: Shark Tooth Hill, NMMNH Locality 487, T9N, R34E, Sec 28, SE1/4, E1/4, NE1/4, Wheatland 7.5’ 1972, South of San Jon, (YPM), Apache Canyon, Quay County, East-Central New Mexico.
Horizon: Duke Ranch Member, Upper Redonda Formation, Chinle Group.
Biostratigraphy: Apachean characteristic assemblage.
Age: Apachean, Late Norian Stage- Rhaetian Stage, Upper Late Triassic Epoch, Late Late Triassic.
Material:
Number: Not given:
HUNT, 1994
Locality: NMMNH locality 110, East Central New Mexico.
Horizon: Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
NMMNH P-4398: Intercentrum.
Locality: NMMNH locality 132, East Central New Mexico.
Horizon: Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
NMMNH P-4589: Intercentrum.
Locality: NMMNH locality 160, East Central New Mexico.
Horizon: Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
NMMNH P-4571: Intercentrum.
Locality: NMMNH locality 171, East Central New Mexico.Horizon: Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
NMMNH P-4855: Intercentrum.
Locality: Revuleto Creek, NMMNH locality 467, East Central New Mexico.Horizon: Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
NMMNH P-16904: Intercentrum.
Locality: NMMNH locality 498, East Central New Mexico.Horizon: Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
NMMNH P-17181: Intercentrum.
Locality: NMMNH locality 499, East Central New Mexico.
Horizon: Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
NMMNH P-17181: Intercentrum.
Locality: NMMNH locality 501, East Central New Mexico.Horizon: Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
NMMNH P-17296: Intercentrum.
Locality: NMMNH locality 518, East Central New Mexico.
Horizon: Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
NMMNH P-17370: Intercentrum.
Locality: NMMNH locality 519, East Central New Mexico.
Horizon: Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
NMMNH P-17178: Intercentrum.
Locality: NMMNH locality 527, East Central New Mexico.
Horizon: Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
NMMNH P-17491: Intercentrum.
Locality: San Juan Badlands, East Central New Mexico.
Horizon: Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
UMMP 7441 (in part): Intercentrum.
HUNT & LUCAS, 1993
Locality: Dinosaur Hill (Lacey Quarry), UCMP locality V82250, PF40), near Lacey Point, 5 to 8 m above Painted Desert Sandstone 1, Fossil Cove Area, in the northern end of Petrified Forest National Park, Arizona.
Horizon: Painted Desert Member, Upper Petrified Forest Formation, Chinle Group.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
UCMP 82/39/37: Skull with partial mandibular ramus and clavicle.
UCMP uncatalogued: Intercentra possibly associated with UCMP 82/39/37
PEFO uncatalogued: Intercentra.
LONG & MURRY, 1995
Number: Not given: Centrum.
CFMNH: Nearly complete skull with small centra.
UCMP: Several dozen centra and incomplete lower jaw.
In addition to the material listed above, there are a great number of vertebral centra and plate fragments referable to A. gregorii in the UCMP collection from this site which were collected between 1983 and 1987.
Locality: Lungfish Locality, SMU 227, Sec. 18, T19N, R24E, 35°3’7"N, 109°50’10"W, Fossil Cove Area, Petrified Forest, Arizona.Horizon: Member?, Chinle Group.
Biostratigraphy:
Age: Late Carnian Stage, Lower Late Triassic Epoch, Late Triassic.
Material:
PEFO 3909:
Locality:
Horizon: Painted Desert Member, Petrified Forest Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
Number: Not given: Intercentrum.
HUNT & LUCAS, 1995Locality: Canada Colorado, NMMNH locality 149, NW 1/4, SW 1/4, NW 1/4, SE 1/4, Sec. 2, T14N, R10E, 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:
Number: Not given: Elongate pleurocentra.
LONG & MURRY, 1995
Locality: Dinosaur Hollow, PEFO 085101 (PF 20, UCMP V84260), Just above Painted Desert Sandstone 2, Chinde Point N Area, Petrified Forest, Apache County, Arizona.
Horizon: Upper Petrified Forest Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
PEFO 4848: 3 centra.
Locality: PEFO 085189 (PF46), 8 to 9 m below Painted Desert Sandstone 1, Boot Ridge NE, Lacey Point NW, Petrified Forest, Apache County, Arizona.
Horizon: Upper Petrified Forest Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
UCMP: Centrum and plate fragments.
Locality: Dead Wash 2, PEFO 085126 (UCMP V82269, PF65), NW 1/4 of SW 1/4, Sec. 12, and Se 14 of SE 1/4, Sec 11, T 19N, R 24E, Dead Wash Area, Petrified Forest, Apache County, Arizona.
Horizon: Upper Petrified Forest Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
UCMP 130018: Centrum.
Locality: Paulcell Shellbed (PF 56), Dry Creek Tank Area, Petrified Forest, Arizona.
Horizon: Upper Petrified Forest Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
UCMP: Centrum.
Locality: Karen’s Point (UCMP V82240, PF75), SW 1/4 of SE 1/4, Sec. 23, T 17N, R 24E, on flats below Flattops Sandstone 1 up to and including conglomerate bed, Flattops E Area, Petrified Forest, Arizona.
Horizon: Upper Petrified Forest Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
CFMNH: Skull and lower jaws with centra.
UCMP 129830: Plate fragments.
Locality: Rim Tank North, PEFO 05104 (UCMP Loc. V82267, PF25). SW 1/4 of NW 1/4, Sec. 4, T 19N, R 24E, Rim Tank North Area, Petrified Forest, Apache County, Arizona.
Horizon: Upper Petrified Forest Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
CFMNH: Posterior portion of skull deck.
UCMP: Partial centrum.
Locality: Milzer Locality, (MNA Loc. 853), Coconino County, Arizona.
Horizon: Owl Rock Member, Upper Chinle Group.
Biostratigraphy:
Age: Late Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
MNA: Skull and plate fragments.
Locality: Locality NMMNH L00550, New Mexico.
Horizon: Garita Creek Formation.
Biostratigraphy:
Age: Adamanian, Latest Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
NMMNH P17602: Centrum.
Locality: Revuleto Creek, Locality NMMNH L174, New Mexico.
Horizon: Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
NMMNH P16594: 7 fragments pectoral plates.
Locality: Apache Canyon, Quay County, (UCMP, YPM), New Mexico.Horizon: Redonda Formation.
Biostratigraphy:
Age: Apachean, Rhaetian, Late Norian Stage, Late Triassic Epoch, Late Late Triassic.
Material:
UCMP V6148/63845, V6148/63846, V6148/63846, YPM 4201: Skulls.
Pectoral elements and centra.
Locality: Rotten Hill Bonebed (PPHM WT), Herring Ranch Locality, Rotten Hill, Potter County, Texas.
Horizon: Lower part of the Tecovas Formation, Chinle Group (or Tecovas Member, Dockum Formation).
Biostratigraphy:Age: Adamanian age, Late Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
PPHM WT 3203: 8 vertebral centra.
Locality: Coller’s Ranch, Crosby County, Texas.
Horizon: Tecovas Member, Dockum Formation.
Biostratigraphy:Age: Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
TTUP 9237: Small Skull, posterior border only.
Note: Referred to Dictyocephalus of DAVIDOW-HENRY, 1989.
Locality: TMM Site 1 (TMM Locality 31172), Crosby County, Texas.Horizon: Tecovas Member, Dockum Formation.
Biostratigraphy:Age: Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
TMM 31172-524: 3 centra.
RINEHART & LUCAS, 2018
Locality: Inadvertent Hills Locality (UCMP V82550), Petrified Forest National Monument, Apache County, Arizona.
Horizon: Painted Desert Member, Petrified Forest Formation, Chinle Group.
Biostratigraphy:
Age: Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
UCMP 171591: Fragmentary skull and dentary of a juvenile.
SPIELMANN, LUCAS & HUNT, 2006
Locality: NMMNH Locality 484, Apache Canyon, Quay County, East-Central New Mexico.
Horizon: Redonda Formation, Chinle Group.
Biostratigraphy: Apachean characteristic assemblage.
Age: Apachean, Late Norian Stage- Rhaetian Stage, Upper Late Triassic Epoch, Late Late Triassic.
Material:
NMMNH P-17040: Ilium fragment.
NMMNH P-17042: Intercentrum.
Locality: NMMNH Locality 2741, Apache Canyon, Quay County, East-Central New Mexico.
Horizon: Wallace Ranch Member, Redonda Formation, Chinle Group.
Biostratigraphy: Apachean characteristic assemblage.
Age: Apachean, Late Norian Stage- Rhaetian Stage, Upper Late Triassic Epoch, Late Late Triassic.
Material:
NMMNH Number: Not given: