Eucoelophysis baldwini Sullivan & Lucas, 1999

Ezcurra, Martín D., 2006, A review of the systematic position of the dinosauriform archosaur Eucoelophysis baldwini Sullivan & Lucas, 1999 from the Upper Triassic of New Mexico, USA, Geodiversitas 28 (4), pp. 649-684 : 651

Eucoelophysis baldwini Sullivan & Lucas, 1999 ( Figs 1B ; 2B, G, H ; 4B, H ; 5B, C, F ; 6D )

HOLOTYPE. — NMMNH P-22298, incomplete postcranial material consisting of two dorsal and four incomplete caudal vertebrae, nearly complete right pubis, partial right ischium, ilum fragment?, fragmentary femora, proximal half of the left tibia, incomplete right metatarsal II and IV, and complete metatarsal III, phalanges, unidentified bone fragments, and probably an incomplete left scapulocoracoid ( Sullivan & Lucas 1999).

EMENDED DIAGNOSIS. — Dinosauriform diagnosable by the following autapomorphies (see Discussion): non-invasive pleurocoels in the dorsal vertebrae; strongly marked U-shaped ischio-acetabular groove ( Sullivan & Lucas 1999); absence of femoral trochanteric shelf; cnemial crest distinctively offset from the tibial shaft, cranially straight, and without lateral notch; and probably femoral fourth trochanter reduced (see below).

Figures

FIG. 1. — Femur of several dinosauriforms in proximal view; A, Marasuchus; B, Eucoelophysis; C, Silesaurus; D, Coelophysis. Abbreviations: cl, caudal lip; ft, fossa trochanterica; gt, greater trochanter; lg, oblique ligament groove; pg, proximal groove; t, tuberosity. Not to scale. A, after Novas 1996; B, after Sullivan & Lucas 1999; C, after Dzik 2003; D, after Padian 1986.

FIG. 2. — Tibiae of several dinosauriforms in proximal view and nearly complete left tibia of Eucoelophysis baldwini Sullivan & Lucas, 1999;A, Marasuchus, proximal view; B, G, H, Eucoelophysis; B, proximal view; G, lateral view; H, medial view; C, Silesaurus, proximal view;D, Herrerasaurus, proximal view;E, Coelophysis, proximal view;F, Gojirasaurus, proximal view. Abbreviations:cc, cnemial crest; ccl, caudal cleft; fc, fibular condyle; g, groove; ket, knee extensor tuberosity; mc, medial condyle. A, after Sereno & Arcucci 1994; C, after Dzik 2003; D, after Novas 1993; E, after Padian 1986; F, after Carpenter 1997. Scale bar: G, H, 1 cm.

FIG. 4. — Proximal half of femur of several dinosauriforms in cranial and caudal views; A, G, Pseudolagosuchus (PULR-PV 53); B, H, Eucoelophysis; C, I, Silesaurus; D, J, Herrerasaurus; E, K, Coelophysis (gracile morph); F, L, Syntarsus (robust morph); A-F, cranial views; G-L, caudal views. Abbreviations as in Figure 1, and ct, cranial trochanter; ft, fourth trochanter; or, obturator ridge; ts, trochanteric shelf. Not to scale. B, H, after Sullivan & Lucas 1999; C, I, after Dzik 2003; D, J, after Novas 1993; E, K, after Padian 1986; F, L, after Rowe 1989.

FIG. 5. — Proximal half of femur of several dinosauriforms in lateral and medial views and left femur of Eucoelophysis baldwini Sullivan & Lucas, 1999 in proximal view; A, Marasuchus; B, C, F, Eucoelophysis; D, Silesaurus; E, Herrerasaurus; G, H, Syntarsus. A, C, D, H, lateral views; B, E, G, medial views; F, proximal view. Abbreviations as in previous figures. Not to scale. A, after Sereno & Arcucci 1994; D, after Dzik 2003; E, after Novas 1993; G, H, after Rowe 1989.

FIG. 6. — Metatarsals of several dinosauromorphs in cranial view; A, Lagerpeton; B, Marasuchus; C, Silesaurus; D, Eucoelophysis; E, Herrerasaurus. Abbreviations: I-V, first to fifth metatarsal. Not to scale.A, after Sereno & Arcucci 1993 and Novas 1996; B, after Sereno & Arcucci 1994 and Novas 1996; C, after Dzik 2003; D, after Sullivan & Lucas 1999; E, after Reig 1963.