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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク African sawtail catshark ： ウィキペディア英語版 African sawtail catshark The African sawtail catshark (''Galeus polli'') is a species of catshark, part of the family Scyliorhinidae. Demersal in nature, it is found at depths of off the western African coast from Morocco to South Africa. This slender species has a rather long, pointed snout, a series of dark saddles along the back and tail, and a prominent crest of enlarged dermal denticles along the upper edge of the caudal fin. Its maximum known length is . The diet of the African sawtail catshark consists of small bony fishes, squid, and crustaceans. It is the only member of its genus known to be aplacental viviparous; reproduction proceeds year-round, with females bear litters of up to 12 pups. In relatively shallower waters, this shark is caught incidentally and utilized for meat or fishmeal. The fisheries off Namibia, where it is most abundant, are well-managed and do not threaten its population. Given also that sharks in deeper waters are not significantly fished, the International Union for Conservation of Nature (IUCN) has assessed this species as Least Concern. ==Taxonomy== In 1953, Belgian ichthyologist Max Poll published a report on sharks and chimaeras captured during a 1948–49 Belgian oceanographic expedition off western Africa, including several seemingly ovoviviparous blackmouth catsharks (''G. melastomus''). As the blackmouth catshark is known to be oviparous, Poll's account alerted French zoologist Jean Cadenat to the presence of a distinct catshark species in the region. After examining more specimens from Senegal, Cadenat described the new species in a 1959 issue of the scientific journal ''Bulletin de l'Institut Francais d'Afrique Noire (Sér A) Sciences Naturelles'', naming it in Poll's honor. 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「African sawtail catshark」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.