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Isistius
''Isistius'' is a genus of Squaliformes, dogfish sharks in the family (biology), family Dalatiidae. They are commonly known as cookiecutter sharks. Members of the genus are known for their unusual behaviour and dentition. Species *''Isistius brasiliensis'' Jean René Constant Quoy, Quoy & Joseph Paul Gaimard, Gaimard, 1824 (cookiecutter shark) *''Isistius plutodus'' Jack Garrick, Garrick & Stewart Springer, S. Springer, 1964 (largetooth cookiecutter shark) *†''Isistius triangulus Probst, 1879 *†''Isistius trituratus Winkler, 1876 Habits The cookiecutter sharks, or cigar sharks, are unusual in the manner in which they replace their teeth. Instead of replacing teeth singly as they get damaged or lost, for example in hunting, such sharks replace the whole set. They can repeat such replacement throughout their lifetimes. Cookiecutter sharks often attack large shoals of fish, but have been known to circle fishing vessels to get an easy meal. They are particularly notorious for b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cookiecutter Shark
The cookiecutter shark (''Isistius brasiliensis''), also called the cigar shark, is a species of small squaliform shark in the family Dalatiidae. This shark occurs in warm, oceanic waters worldwide, particularly near islands, and has been recorded as deep as . It migrates vertically up to every day, approaching the surface at dusk and descending with the dawn. Reaching only in length, the cookiecutter shark has a long, cylindrical body with a short, blunt snout, large eyes, two tiny spineless dorsal fins, and a large caudal fin. It is dark brown, with light-emitting photophores covering its underside except for a dark "collar" around its throat and gill slits. The name "cookiecutter shark" refers to its feeding habit of gouging round plugs, as if cut out with a cookie cutter, out of larger animals. Marks made by cookiecutter sharks have been found on a wide variety of marine mammals and fishes, as well as on submarines, undersea cables, and even human bodies. It also consume ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
