Iphionidae Kinberg 1856

Key to genera of Iphionidae Kinberg, 1856 1 With 13–14 pairs of elytra.............................................................................. 2 - With about 20 pairs of elytra; elytra without fimbriae; prostomium with 2 pairs of eyes; lateral antennae minute; neurochaetae thin without annulations................................................... Iphionides Hartmann-Schröder, 1977 2(1) Prostomium with 2 pairs of eyes; palps with longitudinal series of papillae; lateral antennae on anterolateral margins; neurochaetae of a single type, with fine annulations, usually thick (13 pairs of elytra); elytra with or without fimbriae......................................................................................... Iphione Kinberg, 1856 - Prostomium without eyes; palps smooth; without lateral antennae; elytra with lateral fimbriae; neurochaetae of two types (straight verticillate, and falcate subdistally denticulate)....................................................... 3 3(2) Falcate neurochaetae thick with series of fine annulations (13 or 14 pairs of elytra)...................................................................................................... Thermiphione Hartmann-Schröder, 1992 - Falcate neurochaetae thin without transverse series of annulations (13 pairs of elytra)........... Iphionella M’Intosh, 1885 Alternative key to genera of Iphionidae Kinberg, 1856 (for damaged or incomplete specimens) 1 Neurochaetae thick, rarely thin, with subdistal rings of denticles................................................ 2 - Neurochaetae thin, with denticles, not forming rings.......................................................... 3 2(1) Eyes usually present; prostomium anteriorly bifid; with lateral antennae (13 pairs of elytra; margins smooth or fimbriate, fimbriae complex, never filiform)....................................................... Iphione Kinberg, 1856 - Without eyes; prostomium completely bifid; without lateral antennae (13 or 14 pairs of elytra; lateral margins fimbriate, fimbriae filiform, often with globular bacterial masses)........................ Thermiphione Hartmann-Schröder, 1992 3(1) With eyes; prostomium entire anteriorly; lateral antennae minute (up to 20 pairs of elytra, margins smooth)..................................................................................... Iphionides Hartmann-Schröder, 1977 - Without eyes; prostomium completely bifid; without lateral antennae (13 pairs of elytra, lateral margins fimbriate, fimbriae filiform, sometimes branched)....................................................... Iphionella M’Intosh, 1885