Genus: Poposaurus MEHL, 1915
Etymology: In reference to the Popo Agie River, Fremont County, Wyoming and Greek, sauros, "lizard."
= Lythrosuchus LONG & MURRY, 1995
Etymology: From the Greek, lythron, "gore" and Greek, souchos, "crocodile":
Gore crocodile.
Species: gracilis MEHL, 1915
Etymology: Latin, gracils, "slender."
= Poposaurus agilis GALTON, 1977
Holotype: CNHM No. UR 357
Locality: Little Popo Agie River, near Langer, in Fremont County, Wyoming.
Horizon: Popo Agie Member, Chugwater Formation.
Biostratigraphy:
Age: Late Carnian Stage, Lower Late Triassic Epoch, Late Triassic.
Material: 2 dorsal vertebrae, one caudal vertebra, a left ilium, proximal portion of a left femur, a right femur, the distal portion of the left tibia, part of the shaft of the right tibia.
Referred specimens:
CNHM No. UR 358: Middle section of an ilium.
CARPENTER & PARRISH, 1985
Locality: Revuelto Creek, Quay County, New Mexico.
Horizon: ?Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
UNM: Incomplete left ilium and femoral shaft. (As per LONG & MURRY, 1995).
COLBERT 1961, 1965
Locality: Otis Chalk, Howard County, Texas
Horizon: “Pre-Tecovas Horizon”, Dockum Group.
Biostratigraphy:
Age: Middle Carnian Stage, Lower Late Triassic Epoch, Late Triassic.
Material:
UM. 11748: Middle section of an ilium.
JOYCE & GAUTHIER, 2006, GAUTHIER, NESBITT, SCHACHNER, BEVER & JOYCE, 2011
Locality: Circle Cliffs, Grand Staircase-Escalante National Monument, Garfield County, Utah.
Horizon: Chinle Group.
Biostratigraphy:
Age: Late Triassic.
Material:
YPM VP06109: Premaxilla and nearly complete skeleton.
LONG & MURRY, 1995
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.
Note: 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:
UCMP collections represents at least 3 individuals based on left ilia.
Specimens include
?UCMP 28343: Left surangular/articular from small individual.
UCMP 78719: Complete sacrum with 3 vertebrae.
?UCMP 25824: Distal half of right humerus.
?UCMP 25811: Distal extremity of left humerus.
UCMP 25962: Right ilium.
UCMP 25968: Right ilium missing tip of posterior blade.
UCMP 25974: Left ilium.
Note: With tooth marks.UCMP 25978: Left ilium missing anterior blade and tip of posterior blade and most of acetabular region.
UCMP 27892: Pubic process of small left ilium.
UCMP 25997: Proximal half of left pubis.
UCMP 25971: Proximal end of left pubic shaft.
UCMP 25999: Proximal half of right pubes.
UCMP 25963: Proximal extremity of right pubis.
UCMP 25993: Proximal half of right ischium.
UCMP 25980: Proximal extremity of left ischium.
UCMP 25990: Portion of shaft of left ischium.
UCMP 25994: Proximal extremity of left ischium.
UCMP 28359: Complete right femur.
UCMP 25804: Distal two-thirds of right tibia.
UCMP 25884: Distal extremity of right tibia.
UCMP 34477: Right calcanum.
UCMP 34487: Left astragalus.
UCMP 24496: 3 metatarsals representing 1 individual.
MNA collection includes
MNA V3735: 3 anterior dorsal vertebrae.
MNA Pl. 2943, 3042: Distal caudal vertebrae.
MNA V3696: Left coracoid.
MNA V3743: Proximal extremity of left femur.
MAN V3029: Distal end of metatarsal.
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: Bluewater Creek Formation, Lower Chinle Group.
Biostratigraphy:
Age: Adamanian, Latest Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
MNA Pl. 3077: Partial sacrum.
MNA PV3715: Dorsal centrum.
MNA Pl. 2694: Proximal extremity of left femur.
Locality: Blue Hills 3 (UCMP 7310), St. Johns, Apache County, Arizona.Horizon: Lower Petrified Forest Formation, Chinle Group.
Biostratigraphy:
Age: Latest Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
UCMP 27069: Proximal extremity of left femur.
Locality: ?Battleship Northwest, (UCMP Loc. V8261), on line between NE 1/4 of SE 1/4, Sec. 17, and NW 1/4 of SW 1/4, Sec. 16, T 17N, R 24E, Battleship Northwest Area, Petrified Forest, Apache County, Arizona.Horizon: Lower Petrified Forest Formation, Chinle Group.
Biostratigraphy:
Age: Latest Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
UCMP: Sacrum with at least 3 co-ossified centra.
Locality: St. Michaels S (UA, MNA 227), MNA is approximately 2.8 km south and 5.2 km west of St. Michaels, UA is approximately 3 km south of St. Michaels, St. Michaels Area, Petrified Forest, Apache County, Arizona.Horizon: Lower Petrified Forest Formation, Chinle Group.
Biostratigraphy:
Age: Latest Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
UA 2092: Proximal extremity of left ischium.
Locality: Fossil Garden, PEFO 085003 (UCMP V82252, PF98) (part of UCMP V7034), 6 to 8 m below? Sonsela Sandstone, Devil’s Playground Area, Petrified Forest, Apache County, Arizona.Horizon: Lower Petrified Forest Formation, Chinle Group.
Biostratigraphy:
Age: Latest Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
UCMP 124954: Proximal extremity of left femur.
Note: Found with a juvenile Leptosuchus crosbiensis skull, UCMP 27181.
Locality: Bull Canyon, Gaudalupe County, New Mexico.
Horizon: ?Bull Canyon Formation.
Biostratigraphy:
Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.
Material:
UMM MV-523: Dorsal centra.
UMM MV-502: Distal extremity of a metatarsal, probably belonging to same individual as UNM MV-523.
Locality: TMM Site 3, (TMM Locality 31100), Howard County, Texas.
Horizon: “Pre-Tecovas Horizon”, Dockum Group.
Biostratigraphy:
Age: Middle Carnian Stage, Lower Late Triassic Epoch, Late Triassic.
Material:
?TMM 31100-126: Sacrum with 3 fused centra.
Note: Phytosaur material also mixed with this number.TMM 31100-378: Right calcaneum.
Locality: ?TMM Site 3 (TMM Locality 31098), Howard County, Texas.Horizon: “Pre-Tecovas Horizon”, Dockum Group.
Biostratigraphy:
Age: Middle Carnian Stage, Lower Late Triassic Epoch, Late Triassic.
Material:
?TMM 31098-16: Well-preserved proximal extremity of left pubis.
Locality: L-7 Ranch, Between Cedar Mountain and Negro Hill, Crosby County, Texas.Horizon: Tecovas Member, Dockum Formation.
Biostratigraphy:Age: Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
TTUP: Partial left ilium and dorsal vertebrae.
MUELLER, HUTTENLOCKER, SMALL, PINTO, DEAN-WALLACE & CHATTERJEE, 2022
Locality: Boren Quarry (MOTT VPL 3869), Garza County, Texas.
Horizon: Tecovas Formation, Dockum Group.
Biostratigraphy: Otischalkian LVF.
Age: Early Norian Stage, Middle Late Triassic Epoch, Middle Late Triassic.
Material:
Number: Not given:
MURRY, 1989
Locality: TMM Site 2 (TMM 31171), Kalgary/Home Creek Localities (SMU #120), 33°26’57”N, 101°10’08”W, Head of Home (Homes; Holmes) Creek, Kalgary 7.5' Quadrangle, Crosby County, Texas.
Horizon: Tecovas Member, Dockum Formation.
Biostratigraphy:Age: Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
?TMM 31173-73: 3 fused centra.
TMM 31173-49: Right femur.
TMM 31173-53: Incomplete sacrum
?TMM 31173-69: Parts of two sacral vertebrae (Elder, 1978, p. 92, probably same individual as TMM 31173-53), also 3 dorsal vertebrae.
MURRY, 1989
Locality: Otis Chalk, Quarry 1, West Texas
Horizon: Dockum Formation.
Biostratigraphy:
Age: Tuvalian, Late Carnian Stage, Lower Late Triassic Epoch, Late Triassic.
Material:
Number: Not given: Ilium, ischium and vertebrae.
PARKER & NESBITT, 2013
Locality: Petrified Forest Vertebate (PFV) locality 161, Agate Bridge N, Petrified Forest National Park (PEFO), Apache County, Arizona.
Locality: Camp Butte beds, Sonsela Member, Chinle Formation.
Biostratigraphy:
Age: Carnian Stage, Lower Late Triassic Epoch, Late Triassic.
Material:
PEFO 34865: Nearly complete right ilium, complete right pubis, proximal end of right tibia, partial left maxilla with teeth, partial left dentary, and right prearticular.
POLCYN, WINKLER, JACOS & NEWMAN, 2002
Locality: SMU locality 252, vicinity of North Stinking Springs Mountian, what use to be Seven Springs Ranch, northwest of St. Johns, Apache County, Arizona.
Horizon: Lowe Petrified Forest Formation, Chinle Group.
Biostratigraphy:
Age: Late Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
Number: Not given:
SHIRLEY, SCHACHNER & SHAW, 2010
Locality: Utah.
Horizon:
Biostratigraphy:
Age: Late Traissic.
Material:
Number: Not given: Nearly complete specimen.
Note: Has a pathologic hindlimb.
WEEMS, 2022
Locality: Found in a pit dug for foundations at the Doswell Sewer Plant, located 1/4th mile Northwest of the confluence of the North Anna and Little Rivers, near Doswell, 37.8267°N, 77.4336°W, Taylorsville Basin, Hanover County, Virginia.
Horizon: Poor Farm Member, Falling Creek Fromation, Doswell Group (Upper Falling Creek Member, Doswell Formation, Newark Supergoup).
Biostratigraphy:
Age: Carnian Stage, Lower Late Triassic Epoch, Late Triassic.
Material:
USNM PAL 706605: Vertebral arch.
USNM PAL 706606: Vertebra.
USNM PAL 706607: Proximal end of humerus.
WEINBAUM, 2000, WEINBAUM & HUNGERBUHLER, 2003, 2007
Locality: MOTTU site 690, south of Crosbyton, McCarty Ranch, Crosby County, Texas.
Horizon: Tecovas Member, Dockum Formation.
Biostratigraphy:Age: Carnian Stage, Late Triassic Epoch, Late Triassic.
Material:
TTUP-10419, TMM-4368: 2 partial skeletons.
TTUP-9243: Left ilium and 3rd sacral vertebra.
TTUP-10526: Sacral vertebrae probably from a juvenile.
PARKER & NESBITT, 2013
TTU-P11614: PArtial surangular adn articular.
_____________________________________________________________________________________
Species: langstoni (LONG & MURRY, 1995) WEINBAUM & HUNGERBUHLER,
2007
= Lythrosuchus langstoni LONG & MURRY,
1995
Etymology: In honor of Dr. Wann Langston, professor emeritus of the University
of Texas at Austin, for his tremendous contributions in the field of tetrapod
paleontology.
= Postosuchus kirkpatricki CHATTERJEE, 1985 (partim)
= Poposaurus ELDER, 1987
Holotype: TMM 31025-12
Locality: Trilophosaurus Quarry 1, TMM Quarry 1 (TMM Locality 31025), SMU 122, 32°10’20”N, 101°14’50”W, Hyman 7.5’ Quadrangle, approximately 5 km north of Otis Chalk, Howard County, Texas.
Horizon: “Pre-Tecovas Horizon”, Dockum Group.
Biostratigraphy:
Age: Middle Carnian Stage, Lower Late Triassic Epoch, Late Triassic.
Material: Right ilium.
Referred material:
TMM 31025-257: Right ischium.
TMM 31025-177: Posterior cervical vertebra.
TMM 31025-259: 2 co-ossified anterior dorsal vertebrae.
TMM 31025-257: Anterior dorsal vertebrae.
Note: All probably represent the same individual as the holotype.
Locality: TMM Site 3 (TMM Locality 31100), Howard County, Texas.
Horizon: “Pre-Tecovas Horizon”, Dockum Group.
Biostratigraphy:
Age: Middle Carnian Stage, Lower Late Triassic Epoch, Late Triassic.
Material:
TMM 31100-510: Anterior dorsal vertebra of a small individual.
TMM 31100-511: Approximately ninth presacral vertebra.