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Hexanchus
The sixgill sharks, ''Hexanchus'', are a genus of deepwater sharks in the family Hexanchidae. These sharks are characterized by broad pointed heads, six pairs of gill slits, comb-like, yellow lower teeth, and a long tail. It can grow up to 5 m (18 ft) long and weigh over 600 kg (1320 lb). They are abyssal plain scavengers with a keen sense of smell and are among the first to arrive at carrion, together with hagfish and rattails. They show a characteristic rolling motion of the head when feeding. They have been found at depths of up to .
==Extant Species==
* ''Hexanchus griseus '' Bonnaterre, 1788 (Bluntnose sixgill shark)
* ''Hexanchus nakamurai'' Teng, 1962 (Bigeyed sixgill shark)
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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