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Blurred lanternshark
The blurred lanternshark (''Etmopterus bigelowi'') is a little-known species of dogfish shark in the family Etmopteridae, found around the world in benthic and pelagic habitats from a depth of to over down. This shark forms the ''E. pusillus'' species group with the smooth lanternshark, which are distinguished from other members of its family by having irregularly arranged, flat-topped dermal denticles that give them a "smooth" appearance. Both species are slender-bodied with long heads, two dorsal fins bearing spines, no anal fins, and light-emitting photophores. The blurred lanternshark is larger, reaching or more in length. This species feeds on small squid, fishes, and fish eggs, and is ovoviviparous. It has been assessed as of Least Concern by the International Union for Conservation of Nature, because of its wide distribution and lack of threat from fishing pressure.
==Taxonomy and phylogeny==
Japanese ichthyologists Shigeru Shirai and Hiroyuki Tachikawa described the blurred lanternshark in a 1993 article in the scientific journal ''Copeia'', as part of a taxonomic revision of the ''Etmopterus pusillus'' species group. Shirai and Tachikawa found that the species group comprises the smooth lanternshark (''E. pusillus'') and a hitherto unrecognized second species, which they named ''E. bigelowi'' in honor of Henry B. Bigelow (who, along with William C. Schroeder and Stewart Springer, first described the blurred lanternshark in 1955, but did not see it as being separate from ''E. pusillus'').〔 The ''E. pusillus'' species group is distinguished from other lanternsharks in having truncate (ending in a flat crown as though the tip were cut off), irregularly arranged dermal denticles. This species may also be referred to as the smooth lanternshark or the blurred smooth lanternshark.
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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