Marginocephalians 2- Ceratopsians

Marginocephalians 2- Ceratopsians - Marginocephalians 2-...

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Marginocephalians 2- Ceratopsians http://www.amnh.org/exhibitions/dinosaurs/images/exhibit/gallery/lg/5_pentaceratops.jpg
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Relationships Ornithischians- the bird-hipped dinosaurs Genosaurs- the cheeked ornithischians Cerapodans- genosaurs with a diastema and 5 or fewer premaxillay teeth Marginocephalians- The sister group of the ceratopsians is the pachycephalosaurs
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Marginocephalians are a monophyletic group united by sharing these characters: Narrow shelf over back of skull formed by parietal and squamosal bones Reduced premaxillary contribution to palate Shortened pubis Wide-spaced hips Fig. 13.2, from Martin (2005) An Introduction to the Study of Dinosaurs
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Cladogram of relationships Fig. II.3
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General Information Like pachycephalosaurs, they are a mostly a Cretaceous group- the oldest examples include Archaeoceratops (Early Cretaceous, China) and Chaoyangsaurus (Late Jurassic, China) They persist until the K-T extinction about 65 ma Oldest, most primitive members are all from Asia, suggesting that they evolved there
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Also like pachycephalosaurs, they are geographically restricted to northern hemisphere continents (what was once Laurasia) Fig. 2.9 modified General information continued
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Primitive ceratopsians were small (1-2 meters, 3-6 feet) and bipedal; they also lacked the prominent frills of more advanced ceratopsians General information continued Psittacosaurus mongoliensis from fig. 9.5
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More advanced forms were larger (up to 8 meters long, ~25 feet), were quadrupedal, and had a wide variety of frill and horn arrangements General information continued http://www.mnh.si.edu/highlight/triceratops/77_7777_big.gif http://www.nhm.ac.uk/about-us/news/2007/february/images/ff-370_10499_1.jpg
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continued
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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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Marginocephalians 2- Ceratopsians - Marginocephalians 2-...

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