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Bighead spurdog
The bighead spurdog (''Squalus bucephalus'') is a rare and little-known species of dogfish shark in the family Squalidae. It is found in deep water south of New Caledonia, and over the Norfolk Ridge. Reaching at least in length, this stocky shark is brown above and light below, with a broad head and two dorsal fins with long spines. It is the only member of its genus with both one- and three-pointed dermal denticles. An infrequent bycatch of longline fisheries, this species is listed under Data Deficient by the International Union for Conservation of Nature (IUCN).
==Taxonomy==
The first specimens of the bighead spurdog were collected during South Pacific biodiversity surveys conducted by the Institut de recherche pour le développement (IRD). The species was described by Peter Last, Bernard Séret, and John Pogonoski in a 2007 Commonwealth Scientific and Industrial Research Organisation (CSIRO) publication. The specific name ''bucephalus'' is derived from the Latin ''bu'' ("large") and the Greek ''kephalis'' ("of the head"). Of the four original specimens, a long immature male caught over Norfolk Ridge was selected as the holotype. Morphologically, this species belongs to a subgroup of ''Squalus'' defined by the shortnose spurdog (''S. megalops'') and the Cuban dogfish (''S. cubensis'').
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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