[D] Eucoelophysis baldwini [ncG]
Describer
Sullivan & Lucas, 1999
Time
Triassic Late Carnian Norian
Classification
Not considered dinosaur
Diet
Carnivore
Fossilsite
Chinle Formation, Petrified Forest, Rio Arriba County, New Mexico, US
Info
Genus
Holotype
NMNNH P-22298.
Referred material
Sullivan & Lucas (1999) referred a pubis (AMNH 2706), part of the syntype of Coelophysis longicollis (see Padian 1986), to E. baldwini.
Taxonomic assignment by Nesbitt, S.J., Irmis, R.B. and Parker, W.G. (2007) Non-dinosaurian basal ornithodiran.
Remarks by Nesbitt, S.J., Irmis, R.B. and Parker, W.G. (2007)
The holotype specimen of Eucoelophysis baldwini (Sullivan & Lucas 1999) was collected from a small quarry with a mixed assemblage including Typothorax, represented by an osteoderm and other numerous unidentifiable fragments. Sullivan & Lucas (1999) assigned most of the material to Eucoelophysis based on its proximity to the partially articulated hindlimbs and stated that the scapula may belong to another taxon. They also assigned a pubis from Cope’s original material of Coelophysis to Eucoelophysis based on arguments that it was collected near the type locality of Eucoelophysis and the presence of an apomorphy tying it to the pubis assigned to the holotype of Eucoelophysis.Originally described as a coelophysoid theropod dinosaur, our re-examination of the holotype and comparisons with other Triassic archosaurs (e.g. Silesaurus), suggest that Eucoelophysis is not a coelophysoid and not even a dinosaur.
From Sullivan & Lucas, 1999
Eucoelophysis baldwini Sullivan & Lucas, 1999, a new genus and species to which Cope\\\'s >original< Coelophysis type material (which is now nolonger the type material of Coelophysis) is referred. The former type specimen of Coelophysis bauri is a deficient specimen that preserves no diagnostic attributes beyond those of Theropoda ancestrally (Padian, 1986)
Eucoelophysis baldwini is a new genus and species of theropod dinosaur from the Upper Triassic [Petrified Forest Formation] of the [Chinle Group Chinle Formation] in north-central New Mexico. Eucoelophysis baldwini is diagnosed by the autapomorphous structure of its pubis (presence of ischio-acetabular groove), and femur, which has a sulcus in its proximal surface. It differs from Coelophysis bauri and Syntarsus rhodesiensis in lacking a well- developed posterior femoral notch below the femoral head.
It is further distinguished from Coelophysis bauri in having a tibia that has a distinct appressed surface along the distal two- thirds of the bone and lacks a fibular crest. The original syntypes of Coelophysis longicollis (Cope, 1887a) include a pubis with autapomorphies of Eucoelophysis baldwini and can be assigned to that taxon.
Many of the other syntypes of Coelophysis longicollis, Coelophysis bauri and Coelophysis willistoni probably also belong to E. baldwini, but this cannot be demonstrated with certainty. The type horizon of E. baldwini is in the upper part of the [Petrified Forest Formation], about 45 m stratigraphically below the locality of the neotype of Coelophysis bauri. the Whitaker (Ghost Ranch) quarry, which is in the [Rock Point Formation].
Sullivan & Lucas, 1999
Time
Triassic Late Carnian Norian
Classification
Not considered dinosaur
Diet
Carnivore
Fossilsite
Chinle Formation, Petrified Forest, Rio Arriba County, New Mexico, US
Info
Genus
Holotype
NMNNH P-22298.
Referred material
Sullivan & Lucas (1999) referred a pubis (AMNH 2706), part of the syntype of Coelophysis longicollis (see Padian 1986), to E. baldwini.
Taxonomic assignment by Nesbitt, S.J., Irmis, R.B. and Parker, W.G. (2007) Non-dinosaurian basal ornithodiran.
Remarks by Nesbitt, S.J., Irmis, R.B. and Parker, W.G. (2007)
The holotype specimen of Eucoelophysis baldwini (Sullivan & Lucas 1999) was collected from a small quarry with a mixed assemblage including Typothorax, represented by an osteoderm and other numerous unidentifiable fragments. Sullivan & Lucas (1999) assigned most of the material to Eucoelophysis based on its proximity to the partially articulated hindlimbs and stated that the scapula may belong to another taxon. They also assigned a pubis from Cope’s original material of Coelophysis to Eucoelophysis based on arguments that it was collected near the type locality of Eucoelophysis and the presence of an apomorphy tying it to the pubis assigned to the holotype of Eucoelophysis.Originally described as a coelophysoid theropod dinosaur, our re-examination of the holotype and comparisons with other Triassic archosaurs (e.g. Silesaurus), suggest that Eucoelophysis is not a coelophysoid and not even a dinosaur.
From Sullivan & Lucas, 1999
Eucoelophysis baldwini Sullivan & Lucas, 1999, a new genus and species to which Cope\\\'s >original< Coelophysis type material (which is now nolonger the type material of Coelophysis) is referred. The former type specimen of Coelophysis bauri is a deficient specimen that preserves no diagnostic attributes beyond those of Theropoda ancestrally (Padian, 1986)
Eucoelophysis baldwini is a new genus and species of theropod dinosaur from the Upper Triassic [Petrified Forest Formation] of the [Chinle Group Chinle Formation] in north-central New Mexico. Eucoelophysis baldwini is diagnosed by the autapomorphous structure of its pubis (presence of ischio-acetabular groove), and femur, which has a sulcus in its proximal surface. It differs from Coelophysis bauri and Syntarsus rhodesiensis in lacking a well- developed posterior femoral notch below the femoral head.
It is further distinguished from Coelophysis bauri in having a tibia that has a distinct appressed surface along the distal two- thirds of the bone and lacks a fibular crest. The original syntypes of Coelophysis longicollis (Cope, 1887a) include a pubis with autapomorphies of Eucoelophysis baldwini and can be assigned to that taxon.
Many of the other syntypes of Coelophysis longicollis, Coelophysis bauri and Coelophysis willistoni probably also belong to E. baldwini, but this cannot be demonstrated with certainty. The type horizon of E. baldwini is in the upper part of the [Petrified Forest Formation], about 45 m stratigraphically below the locality of the neotype of Coelophysis bauri. the Whitaker (Ghost Ranch) quarry, which is in the [Rock Point Formation].