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Rebellatrix : ウィキペディア英語版
Rebellatrix

''Rebellatrix'' ("rebel coelacanth", after the unique tail fin) is a genus of large prehistoric coelacanth from the Lower Triassic Sulphur Mountain formation and Wapiti Lake Provincial Park of British Columbia. It is known from a single species, ''R. divaricerca'' ("forked tail"), which is the only known species of the family Rebellatricidae. Its most distinguishing feature was its tuna-like forked tail (unusual for an actinistian fish), which suggested a fast-swimming and active lifestyle, unlike coelacanths related to the living species.
The holotype specimen is a nearly complete fossil, with the exception of some fins and a large amount of the skull, as well as an incomplete tail fin. Three other specimens reveal the rest of the tail. The rebel coelacanth may have reached in length. In addition to its uniquely forked (and symmetrical) tail fin, the posterior dorsal fin is behind the anal fin rather than opposite it. ''Rebellatrix'' is believed to have been a fast-swimming predator, since its tail is clearly built for speed, and modern coelacanths only use the tail fin when attacking prey, and would have been one of the first non-sharks to fill this niche.〔
==References==



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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