| 翻訳と辞書 |
| Crested bullhead shark ： ウィキペディア英語版 |
Crested bullhead shark
The crested bullhead shark (''Heterodontus galeatus'') is an uncommon species of bullhead shark, in the family Heterodontidae. It lives off the coast of eastern Australia from the coast to a depth of . This shark can be distinguished from other members of its family by the large size of the ridges above its eyes and by its color pattern of large dark blotches. It typically attains a length of .
Nocturnal and bottom-dwelling, the crested bullhead shark favors rocky reefs and vegetated areas, where it hunts for sea urchins and other small organisms. It is oviparous, with females producing auger-shaped egg capsules that are secured to seaweed or sponges with long tendrils. Sexual maturation is slow, with one female in captivity not laying eggs until almost twelve years of age. The International Union for Conservation of Nature (IUCN) has assessed this harmless shark as of Least Concern; it is of no economic interest and suffers minimal mortality from bycatch, recreational fishing, and shark nets.
==Taxonomy==
British zoologist Albert Günther originally described the crested bullhead shark as ''Cestracion galeatus'' in the 1870 eighth volume of ''Catalogue of the Fishes in the British Museum''. He chose the specific epithet ''galeatus'' from the Latin for "helmeted", referring to the prominent ridges above the shark's eyes that also give it its common name.〔
Subsequent authors moved this species to the genera ''Gyropleurodus'' and ''Molochophrys'' before placing it in ''Heterodontus''. The type specimen is a long female caught off Australia. This shark may also be referred to as crested shark, crested bull shark, crested horn shark, and crested Port Jackson shark.
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「Crested bullhead shark」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.
|
|