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Apatosuchus
''Apatosuchus'' is an extinct genus of non-crocodylomorph loricatan pseudosuchian known from the Late Triassic of Germany. It is known from a partial holotype skull from the middle Stubensandstein (a deposit that dates back to the Norian stage and is part of the Löwenstein Formation) in Baden-Württemberg. The type species is ''Apatosuchus orbitoangulatus.'' ''A. orbitoangulatus'' was first described by German paleontologist Friedrich von Huene in 1932, who considered it a species of the theropod dinosaur ''Halticosaurus''. Some later studies proposed that it was an early crocodylomorph or "sphenosuchian" like ''Saltoposuchus'', another pseudosuchian from the middle Stubensandstein of Baden-Württemberg. The name ''Apatosuchus'' was erected for ''H. orbitoangulatus'' by Hans-Dieter Sues and Rainer R. Schoch in 2013 when it was realized that the known material represented a pseudosuchian archosaur rather than a dinosaur, as a result of further preparation of the specimen. ''Apatosuchus'' is now thought to be a basal member of the clade Loricata. ''Apatosuchus'' is much smaller in size than other basal loricatans such as ''Teratosaurus '' and ''Batrachotomus''.
==Phylogeny==
A phylogenetic analysis performed by Sues & Schoch (2013) found ''Apatosuchus'' to be the sister taxon of the clade formed by ''Batrachotomus'' and more derived loricatans. This position was supported by two unambiguous synapomorphies: the presence of a ridge on the dorsal surface of squamosal along the edge of supratemporal fossa, and concaved rear portion of the nasals at the midline. The data matrix of Sues & Schoch (2013), a list of characteristics that was used in the analysis, was based on that of Nesbitt (2011), one of the most extensive on archosaurs. Below is a cladogram from the analysis.〔
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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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