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Gracilisuchus
''Gracilisuchus'' — ''slender, long'' (one) (''gracilis'' = slender; Gk. ''sυchnós'' (via irregular derivation) = long ) is an extinct genus of tiny (30 cm long) pseudosuchian (a group which includes the ancestors of crocodilians) from the Middle Triassic. It is placed in the clade Suchia, close to the ancestry of crocodylomorphs. ''Gracilisuchus'' was thought to be a dinosaur, but this hypothesis has since been rejected. Its fossils were first discovered in the 1970s. Many features in the hindlimbs of ''Gracilisuchus'' are also found in a group of primitive crocodylomorphs called sphenosuchians. Sphenosuchians are usually considered a paraphyletic chain of successively primitive crocodylomorphs, but the features they share in common with ''Gracilisuchus'' suggest Sphenosuchia and ''Gracilisuchus'' may form a monophyletic grouping, or valid clade, of crocodylomorphs. A recent paper places the genus in the new family Gracilisuchidae, along with the genera ''Turfanosuchus'' and ''Yonghesuchus'' near the base of the Suchia.
==References==
* Romer, A.S. (1972). "The Chañares (Argentina) Triassic reptile fauna. An early ornithosuchid pseudosuchian, ''Gracilisuchus stipanicicorum, gen. et sp. nov''." ''Breviora'' 389:1-24.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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