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Revision of the Deepsea Anglerfish Genus Rhynchactis Regan (Lophiiformes: Gigantactinidae), with Descriptions of Two New Species
E. Bertelsen and Theodore W. Pietsch
Vol. 1998, No. 3 (Aug. 3, 1998), pp. 583-590
Stable URL: http://www.jstor.org/stable/1447788
Page Count: 8
You can always find the topics here!Topics: Female animals, Holotypes, Teeth, Oceans, Larvae, Jaw, Skin, Larval development, Single status, Paratypes
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The species of the deepsea ceratioid anglerfish genus Rhynchactis (family Gigantactinidae), presently represented in collections by 11 females, five males, and 26 larvae, are reviewed on the basis of all known material. Three species are recognized: the type species of the genus, R. leptonema Regan, represented by the holotype collected from the Western Central Atlantic Ocean and a second specimen recently taken off Hawaii; and two previously unrecorded species, R. macrothrix, described here on the basis of three specimens from the North Atlantic and Indian oceans, and R. microthrix, a single specimen taken from the Indian Ocean. Diagnostic characters are restricted to features of the illicium: secondary illicial filaments, absent in R. leptonema, are long (the five longest 6-15% SL), some with bifid tips, in R. macrothrix, but short (the five longest 2-4% SL) and all simple in R. microthrix. Descriptions are given for all taxa, collection localities are plotted, and a key to females of the species is provided.