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slender sawtail catshark
The slender sawtail catshark (''Galeus gracilis'') is a little-known species of catshark, part of the family Scyliorhinidae, endemic to northern Australia. It is found over the continental slope in on water. Growing to long, this shark has a slim gray body with four dark saddle markings below the dorsal fins and on the caudal fin, as well as a prominent crest of enlarged dermal denticles along the dorsal edge of the caudal fin. The slender sawtail catshark is not valued by fisheries but is taken as bycatch. The International Union for Conservation of Nature (IUCN) presently lacks enough information to assess its conservation status.
==Taxonomy and phylogeny==
Leonard Compagno and John Stevens described the slender sawtail catshark in a 1993 issue of the scientific journal ''Records of the Australian Museum''. They gave it the specific epithet ''gracilis'', meaning "slender" in Latin; previously, the species had been provisionally termed ''Galeus'' sp. A. The type specimen is a long adult female, caught in January 1988 north of Melville Island, Northern Territory. Within the genus, ''G. gracilis'' appears to be closely related to ''G. eastmani'', ''G. longirostris'', and ''G. nipponensis''. A 2005 phylogenetic analysis, based on mitochondrial and nuclear DNA, reported that this species, ''G. eastmani'', and ''G. sauteri'' formed a clade apart from ''G. melastomus'' and ''G. murinus''.
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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