THE UNIVERSITY OF CALGARY Eric Snively A ... - Ohio University

coelurosaurs with an enlarged trenchant daw on their second toe and a
stiffened tail, indicating an agile macropredaceous habit (Ostrom 1969
Ornifholestes hermani (Figure 1.3). Ornitholestes was a small coelurosaur
with long hands and conical premaxillary teath, rather than the blade-like
teeth of most other theropods (Paul 1988). This may indicate a
microcamivorous diet of relatively small prey. The relationship of
Ornitholestes to other coelurosaurs is unclear (Figure 1.1 ).
Camosauria (Figure 1.4): Carnosaurs were large to giant macrocamivorous
theropods. They had proportionally shorter legs but longer and more robust
arms than tyrannosaurids (Hutchinson and Padian 1997b). The phylogenetic
diagram positions Carnosauria as the sister group to the Coelurosauria.
Elaphrosaunrs bambergi (Figure 1.4): Elaphrosaurus is a member of the
Ceratosauria, the sister group to the carnosaur-coelurosaur clade. It had
proportionally gracile lower limbs and a long thoracic region (Galton 1982;
Holtz 1994b); its skull and probable diet are unknown.
1 0. Hemrasa unrs ischigualastensis (Figure 1.4): Henerasaurus was a primitive
theropod in some characteristics, with a long ffih toe and a craniocaudally
short hip. Some cladograms place Hemasautus as an outgroup to other
saurischian dinosaurs, but it has the long raptorial hands and jointed tower
jaw of theropods (Novas 1993). Henerasaums had about the same mass as
a Iioness (Paul 1997).
1 1. Prosauropoda (Figure 1.4): Prosauropods are primitive members of the
Sauropodomorpha, the herbivorous sister taxon to the Theropoda known for
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