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Gavialosuchus
''Gavialosuchus'' is an extinct tomistomine from the late Oligocene and Miocene of eastern North America and early Miocene of Europe. Three species have been named: the type species ''G. eggenburgensis'' from the early Miocene of Austria; ''G. americanus'', from the late Miocene to early Pliocene of Florida; and ''G. carolinensis'', from the late Oligocene of South Carolina. Another species, as yet unnamed, may be present in the Miocene of Georgia. Unlike its modern fresh water relatives, ''Gavialosuchus'' was an estuarine and coastal water crocodilian, living in shallow marine waters alongside ''Metaxytherium'', ''Pomatodelphis'', and ''Hemipristis serra''. It was long-snouted and large: ''G. carolinensis'' was at least 5.37 meters long (17.3 ft), and one specimen of ''G. americanus'' is estimated at long based on a -long skull.〔 〕
As is the case with many fossil taxa, what exactly constitutes ''Gavialosuchus'' is not a settled question. Myrick Jr. (2001) proposed synonymizing ''G. americanus'' with ''Thecachampsa antiqua''. Piras ''et al.'' (2007) advocated transferring both ''G. americanus'' and ''G. carolinensis'' to ''Thecachampsa'' as distinct species of the latter genus. Jouve ''et al.'' (2008) retained ''G. americanus'' in ''Gavialosuchus'' and found it to be the sister group of ''G. eggenburgensis'' (''G. carolinensis'' was not discussed). However, Jouve ''et al.'' (2008) didn't test ''Thecachampsa antiqua'' in their phylogenetic analysis. Shan ''et al.'' (2009) found that ''G. americanus'' and ''G. eggenburgensis'' are not sister taxa. However, they didn't include ''T. antiqua'' and ''G. carolinensis'' in their analysis. Christopher A. Brochu and Glenn W. Storrs (2012) tested all four species, along with other crocodyloids, and found relatively strong support for Piras ''et al.'' (2007) suggestion.
==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「Gavialosuchus」の詳細全文を読む
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