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mouse catshark
The mouse catshark (''Galeus murinus'') is a species of catshark, part of the family Scyliorhinidae, common in the northeastern Atlantic Ocean, from Iceland to Western Sahara. There is much taxonomic confusion regarding this species in Icelandic waters, where it may be confounded with another species of ''Galeus'' or ''Apristurus''. Probably not exceeding long, the mouse catshark has a uniformly brown body and is characterized by large, rounded pelvic fins and crests of enlarged dermal denticles along both the dorsal and ventral caudal fin margins. In addition, in adult males the inner margins of the pelvic fins are merged into an "apron".
Demersal in nature, the mouse catshark inhabits continental slopes at a depth of . It preys mainly on benthic crustaceans, bony fishes, and cephalopods. Reproduction is oviparous, with females producing "furry" egg capsules. Although it is caught incidentally by commercial trawl fisheries, this species does not appear to be threatened by fishing activities and has been listed under Least Concern by the International Union for Conservation of Nature (IUCN).
==Taxonomy and phylogeny==
Norwegian zoologist Robert Collett originally described the mouse catshark as ''Pristiurus murinus'', in a 1904 issue of the scientific journal ''Forhandlinger i Videnskabs-selskabet i Christiania''; its specific epithet means "relating to a mouse" in Latin. The type specimen is an immature female long, collected northwest of the Hebrides at a depth of . Later authors have recognized ''Pristiurus'' as a junior synonym of ''Galeus''.
Some taxonomic confusion has arisen over ''Pristiurus jensenii'', described from Iceland by Bjarni Sæmundsson in 1922, which has traditionally been considered the same species as ''G. murinus''. Recently reported data for ''G. murinus'' have shown inconsistencies between sharks from Iceland and elsewhere, suggesting that ''P. jensenii'' may in fact be a valid species very similar to ''G. murinus''. However, an alternate possibility is that some of the data may have been confounded with a species of ''Apristurus''.〔 The placement of ''G. murinus'' within ''Galeus'' is problematic as it does not much resemble the more typical members of the genus.〔 On the other hand, a 2005 phylogenetic analysis by Samuel Iglésias and colleagues, based on mitochondrial and nuclear DNA, found that ''G. murinus'' forms a clade with ''G. melastomus'', apart from the clade of ''G. eastmani'', ''G. sauteri'', and ''G. gracilis''.
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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