58748 Nansenia megalopa Kawaguchi & Butler, 1984 Microstomatidae Pencil smelts Argentiniformes Teleostei Eastern Atlantic: Ascension Island. FB 2738256 Nansenia megalopa 0 - 640 m ISH 2013 a/71 8 S 14 W 1971 Nansenia megalopa 0 - 640 m ISH 2491/71 7 N 20 W 1971 Nansenia megalopa 0 - 1300 m ISH 1730-1971 1971 Nansenia megalopa 750 - 760 m ISH 2013-1971 a 1971 Nansenia megalopa 640 - 632 m ISH 2013-1971 b 1971 Nansenia megalopa 640 - 632 m ISH 2491-1971 1971 Nansenia megalopa 1300 m