Nansenia is a genus of pencil smelts.
Species There are currently 18 recognized species in this genus: Nansenia ahlstromi Kawaguchi & J. L. Butler, 1984 Nansenia antarctica Kawaguchi & J. L. Butler, 1984 Nansenia ardesiaca D. S. Jordan & W. F. Thompson, 1914 (Robust smallmouth) Nansenia atlantica Blache & Rossignol, 1962 Nansenia boreacrassicauda J. Y. Poulsen, 2015 (Northern fat-tail pencil smelt) Poulsen, J.Y. (2015): A new species of pencil smelt Nansenia boreacrassicauda (Microstomatidae, Argentiniformes) from the North Atlantic Ocean. Zootaxa, 4020 (3): 517-532. Nansenia candida Cohen, 1958 (Blue-throat argentine) Nansenia crassa Lavenberg, 1965 (Stout argentine) Nansenia groenlandica (J. C. H. Reinhardt, 1840) (Greenland argentine) Nansenia iberica Matallanas, 1985 Nansenia indica Kobyliansky, 1992 Nansenia longicauda Kawaguchi & J. L. Butler, 1984 Nansenia macrolepis (Gilchrist, 1922) Nansenia megalopa Kawaguchi & J. L. Butler, 1984 Nansenia oblita (Facciolà, 1887) (forgotten argentine, Mediterranean large-eyed argentine) Nansenia obscura Kobyliansky & S. G. Usachev, 1992 Nansenia pelagica Kawaguchi & J. L. Butler, 1984 Nansenia tenera Kawaguchi & J. L. Butler, 1984 Nansenia tenuicauda Kawaguchi & J. L. Butler, 1984
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