Saurischians 1- the prosauropods

Saurischians 1- the prosauropods - Saurischians 1- the...

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Saurischians 1- the prosauropods http://www.palaeos.com/Mesozoic/Triassic/Images/Plateosaurus_2.jpg Plateosaurus
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Relationships Prosauropods are saurischians, as are the sauropods and theropods Prosauropods and sauropods form a monophyletic group called the sauropodomorpha Theropoda is the sister group to the sauropodomorpha Characters uniting the saurischia is the saurischian pelvis, accessory articulations to the dorsal vertebrae, expanded transverse processes of sacral vertebrae, twisted thumb, etc.
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Saurischian pelvis revisited http://users.tamuk.edu/kfjab02/dinos/dinoart/spelvis.jpg Anterior Posterior
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Some characters uniting the sauropodomorpha as a monophyletic group: Thin, flat, spatulate, serrated teeth Minimum of 10 elongate cervical vertebrae Large digit I with a claw on manus Large hole in pubis near acetabulum Relationships continued Fig. 19.3A of VanHeerden (1997) Fig 11.13a Fig. 17C of Galton (1976)
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Cladogram of saurischian relationships Fig. III.1
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General Temporally, prosauropods are restricted to the Late Triassic and Early Jurassic (~230- 190 ma) Earliest examples are from central Gondwana, in modern Africa, thus it is thought that they evolved there http://www.dinosoria.com/lexique_espece/massospondylus.jpg Skeleton of Massospondylus from the Late Triassic of Africa
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General Geographically, they had a global distribution (this makes sense because they lived while Pangea was still intact) Fig. 11.3 modified
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They are known from the Connecticut
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This note was uploaded on 04/22/2008 for the course GEOL 111 taught by Professor Getty during the Fall '07 term at UConn.

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Saurischians 1- the prosauropods - Saurischians 1- the...

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