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Taxonomic Resolution of the Etmopterus pusillus Species Group (Elasmobranchii, Etmopteridae), with Description of E. bigelowi, n. sp.
Shigeru Shirai and Hiroyuki Tachikawa
Vol. 1993, No. 2 (May 3, 1993), pp. 483-495
Stable URL: http://www.jstor.org/stable/1447149
Page Count: 13
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The Etmopterus pusillus group is characterized by having truncate dermal denticles on the body. It is comprised of two species: E. pusillus, redefined here, and E. bigelowi n. sp., which is described from specimens from the Atlantic and North Pacific oceans, and South African and Australian seas. Etmopterus bigelowi has been confused with E. pusillus because both species exhibit similar morphological changes with growth but differ in that the latter has the following characters: 16-19 turns in the intestinal valves (vs 10-13); 19-24 upper teeth (vs 22-31); 49-57 monospondylous vertebrae (vs 46-53); gradual erection of lower tooth cusp with growth; a more anterior first dorsal fin; a longer first dorsal spine; a larger size at maturity; and a larger maximum body size. Etmopterus frontimaculatus is designated as a junior synonym of E. pusillus, based on examination of all the extant syntypes of these two nominal species.