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Paracrocodylomorpha : ウィキペディア英語版 | Paracrocodylomorpha
Paracrocodylomorpha is a clade of crurotarsan archosaurs that includes crocodylomorphs and several closely related Triassic forms. Erected in 1993, the clade usually contains early crurotarsan taxa like Poposauridae and ''Gracilisuchus''. These groups are considered sister taxa of the clade Bathyotica, which includes Crocodylomorpha and ''Erpetosuchus''. While ''Erpetosuchus'' is widely accepted as the closest relative of crocodylomorphs, the relationship of more basal taxa like ''Gracilisuchus'' and ''Ticinosuchus'' are unclear. ==Description== Paracrocodylomorpha is diagnosed by several unique characteristics, or synapomorphies. A ring of bone surrounds a projection on the calcaneum, a bone of the ankle. A ridge on the calcaneum is also present in Paracrocodylomorpha that runs across its entire length on one side. A foramen, or hole, in the base of the skull between the basioccipital and basisphenoid bones acts as an opening for a cavity in the braincase.
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