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Diplodocoidea was a superfamily of sauropod dinosaurs, which included some of the longest animals of all time, including slender giants like ''Supersaurus'', ''Diplodocus'', ''Apatosaurus'', and ''Amphicoelias''. Most had very long necks and long, whip-like tails; however, one family (the dicraeosaurids) are the only known sauropods to have re-evolved a short neck, presumably an adaptation for feeding low to the ground. This adaptation was taken to the extreme in the highly specialized sauropod ''Brachytrachelopan''. A study of snout shape and dental microwear in diplodocoids showed that the square snouts, large proportion of pits, and fine subparallel scratches in ''Apatosaurus'', ''Diplodocus'', ''Nigersaurus'', and ''Rebbachisaurus'' suggest ground-height nonselective browsing; the narrow snouts of ''Dicraeosaurus'', ''Suuwassea'', and ''Tornieria'' and the coarse scratches and gouges on the teeth of ''Dicraeosaurus'' suggest mid-height selective browsing in those taxa.〔http://www.ploscollections.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0018304;jsessionid=B5ED8399160D7F46A7647ADE513F5B9C.ambra01〕 This taxon is also noteworthy because diplodocoid sauropods had the highest tooth replacement rates of any vertebrates, as exemplified by ''Nigersaurus'', which had new teeth erupting every 30 days.〔Sereno PC, Wilson JA, Witmer LM, Whitlock JA, Maga A, et al. (2007) Structural Extremes in a Cretaceous Dinosaur. PLoS ONE 2(11): e1230.〕 ==Taxonomy== The below taxonomy follows the study of Emanuel Tschopp, Octavio Mateus and Roger Benson, 2015: *Diplodocoidea * *''Haplocanthosaurus'' * *Diplodocimorpha * * *Rebbachisauridae * * *Flagellicaudata * * * *Dicraeosauridae * * * *Diplodocidae * * * * *''Amphicoelias'' * * * * *Apatosaurinae * * * * *Diplodocinae The phylogenetics of Diplodocoidea were reviewed in 2015 with a specimen-level phylogenetic analysis, as well as a species-level analysis. Their cladistic analysis is shown below.〔 }} |label2=Flagellicaudata |2= }} }} |label2=Diplodocidae |2= }} }} |label2=Diplodocinae |2= }} }} }} }} }} }} }} }} }} }} }} 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「Diplodocoidea」の詳細全文を読む スポンサード リンク
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