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Sebecia
Sebecia is an extinct clade of mesoeucrocodylian crocodyliforms that includes peirosaurids and sebecids. It was first constructed in 2007 to include ''Hamadasuchus'', Peirosauridae, and ''Sebecus''. It was initially considered to be the sister taxon of the clade Neosuchia, which includes living crocodilians, although some later studies have placed it within Neosuchia as a basal clade. Sebecians were terrestrial crocodyliforms characterized by their deep snouts and ziphodont dentitions. They first appeared in the Late Cretaceous, survived the Cretaceous–Paleogene extinction event, and went extinct in the Miocene epoch.
According to paleontologists Hans Larsson and Hans-Dieter Sues, who constructed the clade in 2007, Sebecia also includes genera that were once assigned to Baurusuchidae, namely ''Pabwehshi''. However, other baurusuchids, namely ''Baurusuchus'', were placed outside Sebecia. Therefore, Baurusuchidae was considered polyphyletic and thus not a true clade. Below is the cladogram produced from Larsson and Sues' phylogenetic analysis:〔
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Larsson and Sues defined Sebecidae as all taxa more closely related to ''Sebecus'' than to ''Peirosaurus'' or ''Uberabasuchus'', both of which are peirosaurids. They defined Peirosauridae as all taxa more closely related to ''Peirosaurus'' and ''Uberabasuchus'' than to ''Sebecus'', which is a sebecid. This definition is problematic, especially in relation to later phylogenetic studies of crocodyliforms. Many of these studies have found sebecids to be derived members of a clade containing notosuchians, while finding peirosaurids to be basal neosuchians. If the definitions of these two families are applied to later phylogenetic analyses, Sebecidae would include all notosuchians and Peirosauridae would include all neosuchians.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Sebecia」の詳細全文を読む
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