BSC-1005 Chapter 4-5: Cerapoda (Parts 1 and 2)
17 Oct 2016
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Cerapoda (part1)- thumb spikers and the big ducks. Cerapoda: the other major ornithischian ( bird-hipped ) group. The cerapoda include the spike-thumbed iguanodonts, the duck bills, the bone heads, and the horned dinosaurs. The distinguishing characteristic of the cerapodans is: A gap between the front and back teeth called a diastema. The ornithopoda (iguanodonts and duck bills- this chapter) and the. The ornithopod ( bird feet ) cerapodans were gregarious (= herding dinosaurs). We know more biology about them due to this fact. Front teeth well below the cheek teeth; different levels. We do not know, currently, how to differentiate the sex of dinosaurs. Nevertheless, we have learned that there were considerable size and shape differences between the sexes (= sexual dimorphism) in heterodontosaurs. Later advanced ornithopods include the hypsilophodonts, iguanodonts, and hadrosaurs. Criss-crossed back and tail tendons that provided rigidity to the torso and allowed the balancing of the tail like a teeter-totter.
