Choristodera
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Choristodera is an extinct order of semiaquatic diapsid reptiles that ranged from the Middle Jurassic, or possibly Triassic, to the Miocene. Choristoderes are morphologically diverse, with the best kn
Philydrosaurus proseilus NMNS
Ikechosaurus sp. NMNS
Skeleton of Champsosaurus natator at the Canadian Museum of Nature
Skeletons of Hyphalosaurus, in the collections of the Beijing Museum of Natural History (BMNH)
Diapsid
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Diapsids are a clade of sauropsids, distinguished from other reptiles by the presence of two holes, known as temporal fenestrae, in each side of their skulls. The earliest traditionally identified dia
Choristodera
…Choristodera (from the Greek χωριστός chōristos + δέρη dérē, 'separated neck') is an extinct order of semiaquatic diapsid reptiles that ranged from the Middle Jurassic, or possibly Triassic, to the Miocene (168 to 20 or possibly 11.6 million years ago). Choristoderes are…
Nile crocodile head
Skull of the tuatara (Sphenodon punctatus), which has a classic diapsid condition with two completely enclosed temporal fenestrae
Mesosaurus BW
Milleretta BW