New Myxophagan water beetles from Madagascar (Coleoptera: Torridincolidae, Hydroscaphidae) Author Perkins, Philip D. Author Bergsten, Johannes text Zootaxa 2019 2019-08-16 4657 1 57 96 journal article 26002 10.11646/zootaxa.4657.1.2 a7c3cd9d-d4be-4686-a198-3255c948beb8 1175-5326 3369801 F27CB967-C001-436A-9F25-184D5484363C Identification key to species of Incoltorrida 1a. Each elytron with five costae............................................................................ 2 1b. Each elytron with eight costae........................................................................... 3 2a. Larger species (> 2mm ) and more elongate body shape. Pronotum lacking distinct midlongitudinal carina anteriorly................................................................................................ I. quintacostata 2b. Smaller species (< 2mm ) and shorter broader body shape. Pronotum with distinct midlongitudinal carina anteriorly...................................................................................................... I. galoko 3a. Apical part of male aedeagus without spines. Body length> 2mm ............................................... 4 3b. Apical part of male aedeagus spinose. Body length above or below 2mm ......................................... 5 4a. Basal part of pronotum with two carinae. The two transverse ridges of elytron between costae #3-#5 and between costae #5 and #8 offset from each other. Aedeagus evenly wide along most of its length in ventral view and tips not diverging ( Fig. 19 )............................................................................................ I. madagassica 4b. Basal part of pronotum without carinae. The two transverse ridges of elytron between costae #3-#5 and between costae #5 and #8 continuous. Aedeagus widest preapically and tips diverging ( Fig. 21 ).................................... I. magna 5a. Small species (< 2mm ). Basal part of pronotum with both a midlongitudinal carina and two lateral carinae..... I. benesculpta 5b. Medium-sized species (approx. 2mm ). Basal part of pronotum without carinae..................................... 6 6a. Elytral costae strongly developed and anterior oblique carinae of pronotum distinct. Aedeagus in lateral view with apex distinctly narrowed ( Fig. 22 )....................................................................... I. marojejy 6b. Elytral costa less strong and anterior oblique carinae of pronotum not very distinct. Aedeagus in lateral view with apex expanded ( Fig. 12 )............................................................................. I. zahamena