ERTH 2401 Lecture Notes - Lecture 11: Agilisaurus, Hexinlusaurus, Ornithopod
25 Oct 2016
School
Department
Course
Professor
Document Summary
Were the cows, deer and bison of the mesozoic herbivores. Widely distributed; alaska, na northern hemisphere, australia in sh. Lived in diverse habitats in wide range of climates: early history = small (1-2m, later: quite large (up to 12m) Skin impressions used to distinguish different species. Split between ornithopods; agilisaurus and hexinlusaurus vs euornithopoda (iguanodons and hadrosaurids) Juveniles may have been more bipedal than adults. Iguanodons were more functionally quadrupeds going bipedal when in a hurt. Smaller ornithopods were bipedal speedy and agile. Powerful hindlimbs long or longer than forelimbs. Hadrosaurids may have travelled up to 15-20km/hr up to 50km/hour for short sprints. For s(cid:373)aller a(cid:374)i(cid:373)al"s speeds were higher 60km/hr. Gracile forelimbs to grasp leaves and branches. Iguanodons = specialized fingers and hands = multiple functions. Middle digits = tipped with hooves, outer finger = flexible (grasping pinky) Hadrosaurids = 3 main fingers all tipped with hooves only for support. Hadrosaurids food: twigs, berries and coarse plant material.
