|
Dicraeosauridae is a family of sauropod dinosaurs known from the Late Jurassic and Early Cretaceous of Africa and South America. Currently only three genera are recognised; the Jurassic South American genus ''Brachytrachelopan'', the Jurassic African ''Dicraeosaurus'' and the South American Early Cretaceous ''Amargasaurus'', with its distinctive neck spines. All three animals are small by sauropod standards, with relatively short necks. McIntosh (1990) includes a number of genera within the subfamily Dicraeasaurinae of the family Diplodocidae, but many of these are now recognised as belonging to distinct families (Nemegtosauridae and Rebbachisauridae). The group is described cladistically as a stem-based taxon defined as "The most inclusive clade containing ''Dicraeosaurus hansemanni'' Janensch 1914 but not ''Diplodocus longus'' Marsh 1878" or as "all diplodocoids more closely related to ''Dicraeosaurus hansemanni'' than to ''Diplodocus longus'' (Sereno 1998 p.63, Upchurch et al. 2004 p.304, Wilson 2005 p.35) ImageSize = width:1200px height:auto barincrement:15px PlotArea = left:10px bottom:50px top:10px right:10px Period = from:1824 till:2100 TimeAxis = orientation:horizontal ScaleMajor = unit:year increment:50 start:1824 ScaleMinor = unit:year increment:10 start:1824 TimeAxis = orientation:hor AlignBars = justify Colors = #legends id:CAR 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「Dicraeosauridae」の詳細全文を読む スポンサード リンク
|