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Laurasiformes
Laurasiformes (meaning "Laurasian forms") is an extinct clade of sauropod dinosaurs from the late Early Cretaceous of Europe, North and South America. Defined in 2009 by the Spanish paleontologist Rafael Royo-Torres as a clade containing sauropods more closely related to ''Tastavinsaurus'' than to ''Saltasaurus''. Genera purported to form part of this clade include ''Aragosaurus'', ''Galvesaurus'', ''Phuwiangosaurus'', ''Venenosaurus'', ''Cedarosaurus'', ''Tehuelchesaurus'', ''Sonorasaurus'' and ''Tastavinsaurus''.〔
Its exact position and validity is uncertain and varies between authors. A cladistics analysis found a similar grouping outside Titanosauriformes, while others have placed them inside Somphospondyli or Brachiosauridae, consequently, it has been suggested that ''Tehuelchesaurus'' along with others of the previously mentioned genera, form two different clades outside titanosaurimorfes (Carbadillo et al., 2011) while a more recent cladistics analysis found no support for the existence of the clade, with a revision of its supporting features finding them problematic due to being poorly defined, not present on most of the "laurasiforms" or being features present in many sauropods of other clades.
==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「Laurasiformes」の詳細全文を読む
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