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roughtail catshark : ウィキペディア英語版
roughtail catshark

The roughtail catshark or marbled catshark (''Galeus arae'') is a common species of catshark, part of the family Scyliorhinidae. It is found at a depth of in the northwestern Atlantic Ocean, the Gulf of Mexico, and the Caribbean Sea, from North Carolina to Costa Rica. Individuals of different sexes and ages are segregated to some degree. A small species not exceeding in length, the roughtail catshark has a slender body with a marbled color pattern of dark saddles and spots, and a prominent crest of enlarged dermal denticles along the dorsal edge of its caudal fin. This species feeds mainly on shrimp and is oviparous. It is caught incidentally in shrimp trawls, though trawl fisheries within its range mostly do not operate at the depths it inhabits. As a result, the International Union for Conservation of Nature has listed it under Least Concern.
==Taxonomy==
John T. Nichols of the American Museum of Natural History originally described the roughtail catshark as ''Pristiurus arae'' in a 1927 issue of ''American Museum Novitates''. He named the species after the trawler ''Ara'', which collected the first two specimens, both long immature females, off Miami Beach on March 31, 1926. Later authors have recognized ''Pristiurus'' as a junior synonym of ''Galeus''. The Antilles catshark (''G. antillensis'') and the longfin sawtail catshark (''G. cadenati'') were regarded as subspecies of ''G. arae'', until taxonomic revisions were published by Hera Konstantinou and colleagues in 1998 and 2000. The three species, along with the southern and Springer's sawtail catsharks (''G. mincaronei'' and ''G. springeri''), are grouped together in the ''G. arae'' species complex.

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