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bluegrey carpetshark
The bluegrey carpetshark or Colclough's shark (''Brachaelurus colcloughi'') is an uncommon species of carpet shark endemic to shallow inshore waters off northeastern Australia. It is one of the two extant members of the family Brachaeluridae. The bluegrey carpetshark has a stocky body with a wide, slightly flattened head, dorsally placed eyes, and a pair of long barbels with posterior skin flaps. It has large pectoral fins, two dorsal fins of unequal size placed far back on the body, and a sizable space between the anal fin and the base of the caudal fin. Growing to long, this species has a black-and-white color pattern as a juvenile, which largely fades with age such as that adults are brownish.
When removed from the water, the bluegrey carpetshark will close its eyes like the related blind shark (''Brachaelurus waddi''). It feeds on benthic invertebrates and bony fishes, and is aplacental viviparous with females bearing litters of 6–7 pups. The International Union for Conservation of Nature (IUCN) has assessed this species as Vulnerable, given its rarity and restricted occurrence in heavily utilized waters. It is taken in small numbers by commercial and recreational fisheries, and for the aquarium trade.
==Taxonomy==
The bluegrey carpetshark was described by Australian ichthyologist James Douglas Ogilby as a species of ''Brachaelurus'', in an 1908 issue of ''Proceedings of the Royal Society of Queensland''. He named the shark after his friend John Colclough, and based his account on two immature males about long from Moreton Bay in Queensland, one of which was later "accidentally destroyed".〔〔
In 1940, Gilbert Percy Whitley published the first illustrations of the bluegrey carpetshark, but unfortunately they were inaccurate in some respects, particularly on omitting a midline groove on the chin. Much taxonomic confusion then resulted, on whether the bluegrey carpetshark and the blind shark belonged to separate genera or even constituted separate species, that were not resolved until the Queensland Museum obtained new specimens for study.〔 Other common names for this species include blue-grey catshark, bluegrey shark, and southern blind shark.〔 The genus Heteroscyllium is a synonym of Brachaelurus.
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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