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Silesauridae
Silesauridae is an extinct clade of dinosauriformes, a group of Triassic reptiles that included early ancestors of the dinosaurs. The silesaurids were a sister clade to the dinosaurs. The group was named in 2010 by paleontologist Max C. Langer and colleagues from Brazil and Argentina. They defined it as a branch-based clade of all archosaurs closer to ''Silesaurus opolensis'' than to either ''Heterodontosaurus tucki'' or ''Marasuchus lilloensis''. At the same time, a second group of scientists independently named Silesauridae as a node-based clade consisting of ''Lewisuchus'', ''Silesaurus'', their common ancestor and all its descendants.〔 Currently, both definitions encompass the same group of animals. In a later paper, Nesbitt and colleagues noted that the earlier definition by Langer ''et al'' did not include a diagnosis, and so was not sufficient to create a ranked family-level name according to the ICZN. Therefore, the family Silesauridae is attributed to Nesbitt ''et al.'' 2010 while the clade Silesauridae is attributed to Langer ''et al.'' 2010.
The fossils range in age from the Anisian to the Norian stages of the Triassic, about 245 to 203 million years ago.〔Nesbitt, Sterling J., Sidor, Christian A., Irmis, Randall B., Angielczyk, Kenneth D., Smith, Roger M.H. and Tsuji, Linda A. (2010) "Ecologically distinct dinosaurian sister group shows early diversification of Ornithodira." ''Nature'' 464(7285):95-8 (Supplement )〕〔Langer, M.C., Ezcurra, M.D., Bittencourt, J.S., and Novas, F.E. (2010). "The origin and early evolution of dinosaurs". ''Biological Reviews'' 85:55-110. 〕 To date, the members of the Silesauridae are ''Silesaurus'' (which lends its name to the family), ''Asilisaurus'', ''Diodorus'', ''Eucoelophysis'', ''Lewisuchus'', ''Sacisaurus'', ''Technosaurus'', ''Ignotosaurus'', ''Lutungutali'' and possibly ''Pseudolagosuchus''. The cladogram below follows Kammerer, Nesbitt & Shubin (2012) phylogenetic analysis of basal ornithodirans.〔
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==References==
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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