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smooth lanternshark
The smooth lanternshark or slender lanternshark (''Etmopterus pusillus'') is a species of dogfish shark in the family Etmopteridae, found widely in the Atlantic and Pacific Oceans. It inhabits benthic environments at a depth of , and pelagic environments at a depth of . The smooth lanternshark forms a species group with the larger blurred lanternshark (''E. bigelowi''), both of which are distinguished from other members of their family by small, irregularly arranged dermal denticles with a truncated shape. This species has a slender, dark brown body with an indistinct black band on the sides over the pelvic fins, and reaches in length. This slow-growing, ovoviviparous shark feeds on smaller squid, fishes, and fish eggs. Smooth lanternsharks are often caught as bycatch in eastern Atlantic and Japanese commercial fisheries. The International Union for Conservation of Nature (IUCN) has evaluated this species as of Least Concern because of its wide distribution and limited threats.
==Taxonomy and phylogeny==
The first scientific description of the smooth lanternshark, as ''Acanthidium pusillum'', was published by British biologist Richard Thomas Lowe, in an 1839 issue of the scientific journal ''Transactions of the Zoological Society of London''. This species was later moved to the genus ''Etmopterus''. The specific epithet ''pusillus'' means "weak" in Latin. The smooth lanternshark forms a species group with the blurred lanternshark (''E. bigelowi''); these two species are distinguished from other lantern sharks by their irregularly arranged, truncated (ending in a flat crown as though the tip were cut off) dermal denticles.
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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