Saurischians 2- the sauropods

Saurischians 2- the sauropods - Saurischians 2- the...

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Unformatted text preview: Saurischians 2- the sauropods http://dinosaurus.chatkamer.com/images/brachiosaurus.jpg Relationships Sauropods 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 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 Diplodocus manus, ACM public display http://www.sauropod-dinosaurs.uni-bonn.de/bodysize.gif www2.nature.nps.gov/geology/paleontology/ paleo_5_4/sauropod.jpg Cladogram of saurischian relationships Fig. III.1 General Temporally, sauropods are one of the longest lived groups, having evolved in the Late Triassic and going extinct at the end of the Cretaceous (~220 ma- 65 ma) Earliest examples are known from footprints in North America and from skeletons in Asia and Africa, suggesting that they have an earlier, unrecorded history Isanosaurus attavipachi , a Late Triassic sauropod from Thailand http://dinonews.net/images/dinos/isanosaurus.jpg they were most abundant in the Jurassic Period General Geographically, they had a global distribution (this makes sense because they lived while Pangea was still intact) Fig. 11.3 modified General information continued They were the largest land animals to have ever lived, possibly reaching 40 m (130 feet) long http://cache.eb.com/eb/image?id=8050&rendTypeId=4 Body plan They had long necks and tails, a disproportionately small skull, a bulky body, and moderately long front limbs relative to the hind limbs http://internt.nhm.ac.uk/resources/nature-online/life/dinosaurs/dino-directory/drawing/Apatosaurus.jpg Sauropods were obligate quadrupeds Their limbs were highly modified to support the weight:...
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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 2- the sauropods - Saurischians 2- the...

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