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|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Reptilia - Simoedosauridae
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|K. -Q. Gao and R. C. Fox 1998||Choristoderes that differ from closely related Champsosauridae by the following autapomorphies: snout elongate but less than 1/2 of skull length; postorbital/postfrontal always fused to form postorbitofrontal; reduced contact of parietal with postorbital/postfrontal complex; postorbital process complex; postorbital process of jugal low or lost; interpterygoid vacuity small, posteriorly located, not enclosed by pterygoid posteriorly; suborbital fenestra subtriangular with straight medial border; posterior openings of internal carotid artery penetrating parasphenoid and opening ventrally; posttemporal fenestra closed; paraoccipital process slightly deflected ventrally; mandibular symphysis anteroposteriorly short, restricted to anterior 1/3 of dentary tooth row; marginal tooth sockets transversely expanded|