Genus: Eucoelophysis SULIVAN & LUCAS, 1999
Etymology: Derived from the name of the ceratosaurian theropod Coelophysis (to which it is closely related) and the Greek, eu, “good, true”, Greek, coelo “hollow” and Greek, physis “nature”: True Coelophysis.

Species: baldwini SULLIVAN & LUCAS, 1999
Etymology: The specific name honors the 19th century fossil collector David Baldwin, who collected the original type material of Coelophysis, one element of which can now be referred to the new taxon.
= Ceratosauria incertae sedis LUCAS, HUNT & LONG, 1992/LONG & MURRY, 1995

Holotype: NMMNH P-22298

Locality: Cross “quarry”, northeast side of the base of the Orphan Mesa (loc. 3), NW ¼, Section 19, T24N, R5E, Ghost Ranch Quadrangle, Rio Arriba County, New Mexico.

Horizon: Upper Petrified Forest Formation, Chinle Group.

Biostratigraphy:

Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.

Material: Incomplete postcranial material of an immature (subadult) individual, consisting of two dorsal and 4 incomplete caudal vertebrae, incomplete left scapulocoracoid, nearly complete right pubis, partial right ischium, ?ilium fragment, parts of both femora, greater proximal part of the right tibia, complete metatarsal III, incomplete metatarsals II and IV, phalanges, and unidentified bone fragments.

Referred material:

RINEHART, LUCAS, HECKERT, SPIELMANN & CELESKEY, 2009

RTMP 84-63-33: A partial series, a complete sacrum, and pelvic girdle, a partial caudal series, a partial shoulder girdle and forelimb, complete hindlimbs and peds.

 

IRMIS, NESBITT & DOWNS, 2006, BREEDEN, IRMIS, NESBITT, SMITH & TURNER, 2026

Locality: Hayden Quarry, near Ghost Ranch Quarry, Rio Arriba County, New Mexico.

Horizon: Petrified Forest Member, Chinle Formation (or Petrified Forest Formation, Chinle Group).

Biostratigraphy:

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

Material:

GR 190: Proximal end of left tibia.

GR 195: Right femur;

GR 390: Left femur.

GR 1112: Right tibia..

GR 1113: Right tibia.

GR 1114: Right femur.

GR 1117: Left femur.

GR 1118: Associated left ilium, right femur and right femur.

GR 1119: Proximal end of right femur.

GR 1121: Left femur.

GR 1123: Right femur.

GR 1127: Left tibia.

Possibly referred material:

GR 192: Right dentary.

GR 224: Right dentary.

GR 225: Right ilium.

GR 1072: Right dentary.

GR 1089: Left lium.

GR 1090: Proximal end of right femur.

GR 1091: Left humerus missing distal end.

GR 1092: Right ilium.

GR 1093: Tooth with root.

GR 1094: Partial rigth ischium.

GR 1095: Tooth.

GR 1096: Tooth with root.

GR 1097: Tooth with root.

GR 1098: Left humerus missing distal end.

GR 1099: Right dentary.

GR 1100: Tooth with root.

GR 1101: Tooth.

GR 1102: Partial denary with teeth.

GR 1103: Partial left pubis.

GR 1104: Partial right pubis.

GR 1105: Tooth.

GR 1106: Tooth with root.

GR 1107: Tooth with root.

GR 1108: Tooth.

GR 1109: Tooth.

GR 1110: Left ilium.

GR 1111: Left pubis.

GR 1115: Tooth with root.

GR 1116: Tooth with root.

GR 1120: Right dentary with 4 teeth.

GR 1122: Partial right maxilla.

GR 1124: Partial right ischium.

GR 1125: Left humerus.

GR 1126: Tooth.

GR 1128: Tooth.

GR 1129: Portions of a left ilum comprising the postacetabular process, pubic peduncle, and ischiac peduncile.

GR 1130: Tooth.

GR 1131: Tooth with root.

GR 1132: Partial right ilium mssing anterior and postacetabualr process.

GR 1133: Partial left and right ischia.

GR 1134: Left ilium.

AMNH FARB 2706: Right pubis.

Note: Originally referred to Coelophysoidea Ezcurra, 2006, Nesbit et al, 2007.