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

3. Troodontidae (Figure 1.2): Trwdontids were arctometatarsalians the size of
humans or smaller, with finely grasping hands, a hyperextesible claw on their
second toe, and possibly an omnivorous diet (Holtz et al. 2000, Ryan et al.
2000). Together with the Omithomimidae, troodontids constitute the clade
Bullatosauria, the arctometatarsalian sister taon to Tyrannosauridae.
4. Oviraptorosauria (Figure 1.3): Oviraptorosaurs were small theropods with
long grasping hands; several specimens have short tails. Known
oviraptorosaur skulls are toothless, with a parrot-like anterior arching of the
lower jaws. They were at least partially mmivorous; bones of neonate
dromaeosaurids were discovered in the nest of one oviraptorosaur. Two
families of oviraptorosaurs are shown on the phylogeny, the Oviraptoridae
and Elmisauridae. Members of the Elmisauridae possess an arctometatarsus
(Cume 1990).
5. Therizinosauridae (Figure 1.3): Therizhosaurs were bizarre coelurosaurs with
broad and deep bellies, short legs, and long forelimbs with very large claws
(Maryanska 1997). Their coarsely serrated or crmellated teeth are similar to
those of herbivorous lizards. Omitholestes hermani (Figure 1.3): Omitholestes
was a small welurosaur with long hands and conical premaxillary teeth,
rather than the blade-like teeth of most other theropods (Paul 1988). This may
indicate a microcamivorous diet of relatively small prey.
6. Dromaeosauridae (Figure 1.3): The sister group to birds (or Aves on the
phylogeny), dromaeosaurids were dog- to bear-sized macrocarnivorous