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Sixgill sawshark
The sixgill sawshark, ''Pliotrema warreni'', the only member of the genus ''Pliotrema'', is a sawshark of the family Pristiophoridae. Presence of 6 pairs of gill slits highlights this genus among sharks; outside Hexanchiformes order, ''Pliotrema'' is the only shark with more than 5 gill slits. Unlike other sawsharks, the barbs on this shark's rostrum continue onto the sides of the head. Its barbels are also closer to its mouth than in other species. At maximum, females can reach over 136 cm long, and males can reach over 112 cm long.
==Range and Habitat==
The sixgill sawshark is found in the temperate and subtropical waters of the western Indian Ocean between latitudes 23° S and 37° S, at depths of between 37 and 500 m. This shark lives in the benthic and benthopelagic zones of the continental shelf. Adults are partially segregated from juveniles, as they naturally tend to aggregate at lower depths. 〔http://species-identification.org/species.php?species_group=sharks&id=224〕
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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