Incoltorrida, Perkins & Bergsten, 2019

Perkins, Philip D. & Bergsten, Johannes, 2019, New Myxophagan water beetles from Madagascar (Coleoptera: Torridincolidae, Hydroscaphidae), Zootaxa 4657 (1), pp. 57-96 : 64

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

Figures

FIGURES 19–20. (19) Incoltorrida madagassica, male genitalia of non-type; (20) Incoltorrida benesculpta, male genitalia of holotype.

FIGURES 21–22. Incoltorrida, male genitalia of holotypes. (21) I. magna; (22) I. marojejy.

FIGURES 11–12. Incoltorrida zahamena, holotype, habitus and aedeagus.