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Southern African frilled shark
The southern African frilled shark (''Chlamydoselachus africana'') is a species of shark in the family Chlamydoselachidae, described in 2009. It is found in the deep waters off southern Angola to southern Namibia. This species is difficult to distinguish from the better-known frilled shark (''C. anguineus''), but is smaller at maturity and differs in several proportional measurements including head length and mouth width. It seems to be a specialized predator of smaller sharks, using its flexible jaws and numerous needle-like, recurved teeth to capture and swallow them whole. Reproduction is presumably ovoviviparous, as with the other member of its family.
==Taxonomy==
The frilled shark (''C. anguineus'') was long thought to be the only extant member of its genus and family. The existence of a second ''Chlamydoselachus'' species off southern Africa was first suspected from a specimen caught off Lüderitz, Namibia in February 1988, by the South African research ship FRS ''Africana'' (after which this species would eventually be named). The specimen was an adult male smaller than other known mature ''C. anguineus'', and subsequent investigations revealed other consistent differences between frilled sharks in this region and ''C. anguineus''. The new species was termed ''Chlamydoselachus'' "sp. A", before being formally described in 2009 by David Ebert and Leonard Compagno, in a paper for the scientific journal ''Zootaxa''. The holotype was a long immature female caught at a depth of off the Cunene River, Namibia, by the research vessel ''Benguela''.
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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