FAMILY Microstomatidae Bleeker, 1859 - pencil smelts [=Microstomatini, Xenophthalmichthyidae, Prososcopidae, Nanseniini] GENUS Microstoma Cuvier, 1816 - pencil smelts Species Microstoma australis Gon & Stewart, 2014 - Australian argentine Species Microstoma microstoma (Risso, 1810) - slender argentine [=argenteum, mediterranea, rotundata] GENUS Nansenia Jordan & Evermann, 1896 - pencil smelts [=Bathymacrops, Euproserpa] Species Nansenia ahlstromi Kawaguchi & Butler, 1984 - Ahlstrom's pencil smelt Species Nansenia antarctica Kawaguchi & Butler, 1984 - Antarctic pencil smelt Species Nansenia ardesiaca Jordan & Thompson, 1914 - robust smallmouth Species Nansenia atlantica Blache & Rossignol, 1962 - Eastern Atlantic pencil smelt Species Nansenia boreacrassicauda Poulsen, 2015 - Poulsen's pencil smelt Species Nansenia candida Cohen, 1958 - bluethroat argentine [=sanrikuensis] Species Nansenia crassa Lavenberg, 1965 - stout argentine Species Nansenia groenlandica (Reinhardt, 1840) - Greenland argentine Species Nansenia iberica Matallanas, 1985 - Matallanas' Eastern Pacific pencil smelt Species Nansenia indica Kobyliansky, 1992 - Western Indian pencil smelt Species Nansenia longicauda Kawaguchi & Butler, 1984 - longtailed pencil smelt Species Nansenia macrolepis (Gilchrist, 1922) - KwaZulu pencil smelt Species Nansenia megalopa Kawaguchi & Butler, 1984 - Southeastern Atlantic pencil smelt Species Nansenia oblita (Facciola, 1887) - Facciola's pencil smelt [=rissoanum] Species Nansenia obscura Kobyliansky & Usachev, in Kobyliansky, 1992 - Kobyliansky's Western Indian pencil smelt Species Nansenia pelagica Kawaguchi & Butler, 1984 - pelagic pencil smelt Species Nansenia schmitti (Fowler, 1934) - Philippines pencil smelt Species Nansenia tenera Kawaguchi & Butler, 1984 - Cape pencil smelt Species Nansenia tenuicauda Kawaguchi & Butler, 1984 - Southwestern Atlantic pencil smelt GENUS Xenophthalmichthys Regan, 1925 - pencil smelts [=Prososcopa] Species Xenophthalmichthys danae Regan, 1925 - Regan's pencil smelt [=stilbia]