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Proterosuchidae (or Chasmatosuchidae) are an early, most certainly , assemblage of whose fossils are known from the Latest Permian of Russia and the Early Triassic of southern Africa, Russia, China, Australia, and Antarctica. They were slender, medium-sized (about 1.5 meters long), long-snouted and superficially crocodile-like animals, although they lack the armoured of true crocodiles, and in their skeletal features are much more primitive. Their most characteristic feature is a distinct down-turning of the (the front of the upper jaw, which overhangs the lower jaw). the limbs are short and indicate a sprawling posture, like contemporary but unlike most later archosaurs.
The Proterosuchids represent perhaps the earliest of the archosaurs. They gave rise to the some time in the Early Triassic.
References:
- (2000), Vertebrate Paleontology, 2nd Ed.; (2004) 3rd edition Blackwell Science Ltd
- (1988), Vertebrate Paleontology and Evolution, WH Freeman & Co.
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Range: Late Permian to Early Triassic ( to ) of Russia, South Africa & Australia -- possibly South America.
Author Broom, 1906 or ,
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Proterosuchidae is an outgroup of sensu Gauthier, 1986, composed of archaic ranging from the Upper of Russia to the Lower of southern Africa, and thus arguably representing one of the earliest adaptive radiations of . Proterosuchidae is primarily underwritten by characters and thus its is questionable, although the distinct down-turning of the is an of the clade, most likely attributable to their basal position on the cladogram (Charig & Sues 1976, Carroll 1988, Benton in Dodson et al 1990). Furthermore, the lack of a lateral seems to support of Proterosuchidae.
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: $ marked down-turn of premaxilla; supratemporal and postparietal, pineal opening, all retained; mandibular fenestra absent; shoulder girdle clearly divided as scapula & coracoid (compare Lepidosaurs); flat pelvis without thyroid fenestration; sprawling gait: head of femur terminal and directed horizontally to acetabulum.
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- Infraclass
- (unranked)
- Family Proterosuchidae
- Family Proterosuchidae
- (unranked)
see also - list of species ()
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- (Dutch)
- (German)
- (German -- elementary, but good)
- (Mikko's Phylogeny)
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