ERTH 2401 Lecture Notes - Lecture 10: Ceratopsia, Ceratopsidae, Leptoceratopsidae
25 Oct 2016
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Document Summary
Well studied group large fossil record = abundant. Mostly in the cretaceous of na and asia rare fragments from europe. Greta herds in alberta, montana and wyoming (badlands) Triceratops: large skull, strong limbs, strong, solid scapulae, quadrupedal, gate is an in between sprawling gate (slightly sprawling) Distribution: badlands in na, asian regions northern hemispheres. Defined by presence of a rostral bone forming the upper beak (beak structure) Types of ceratopsia: 1) psittacosauridae, 2) basal neoceratopsians (including protoceratopsids, leptoceratopsids, 3) ceratopsidae, 2 & 3 = neoceratopsia. Bipedal vs quadrupedal: psittacocaurus bipedal (no frill, neoceratopsia quadrupeds, secondary evolutionary step back quadrupality ad(cid:448)a(cid:374)tage for these a(cid:374)i(cid:373)als" (cid:271)/(cid:272) of the heavy skull; need the support. Characteristic features: rostral bone: unique bine at tip of snout leading to a parrot-like beak, skull that is narrow at the beak and flaring broad at the back, deep in cheek region, e. g.
