Ochodaeinae, Streubel, 1846

Paulsen, M. J., 2007, Nomenclatural changes in the Nearctic Ochodaeinae and description of two new genera (Coleoptera: Scarabaeoidea: Ochodaeidae), Insecta Mundi 2007 (21), pp. 1-13 : 2-3

Key to genera of Nearctic Ochodaeinae

1. Anterior margin of pronotum not simply concave, instead margin produced behind eyes. Antenna with 9 antennomeres .................................................................... Cucochodaeus , new genus

— Anterior margin of pronotum simply concave, not produced behind eyes. Antenna with 10 antennomeres ............................................................................................................................ 2

2(1). Apex of elytra dentate, interlocking with 2 tubercles on propygidial margin ( Fig. 2 ) ................... ......................................................................................................... Parochodaeus Nikolajev — Apex of elytra not dentate, instead evenly rounded. Propygidium lacking tubercles (sulcus may be present on surface) ..................................................................................................................... 3

3(2). Propygidium lacking sulcus. Antennal club loose, elongate. Male with mentum strongly produced ventrally into a laminar plate ............................................................. Codocera Eschscholtz

— Propygidium with longitudinal sulcus ( Fig. 3-4 ). Antennal club compact, ovoid. Mentum of male not produced ventrally into a laminar plate ............................................................................. 4

4(3). Mentum distinctly longitudinally impressed from apex to base ( Fig. 6 ). Propygidium elongate with subparallel sulcus ( Fig. 3 ) .................................................... Xenochodaeus , new genus

— Mentum flat, only weakly emarginate apically ( Fig. 5 ). Propygidium short, with trapezoidal sulcus ( Fig. 4 ) .................................................................................... Neochodaeus Nikolajev

Figures

Figure 1-4. Propygidia of Nearctic Ochodaeinae genera. Scale bars = 0.5 mm. 1) Unmodified propygidium of Cucochodaeus sparsus, with elytral apices evenly rounded. 2) Two tubercles present on apex of propygidium in Parochodaeus duplex, dentate elytral apices also shown. 3) Elongate propygidium with subparallel sulcus in Xenochodaeus simplex. 4) Short propygidium with trapezoidal sulcus in Neochodaeus praesidii, arrow indicates stridulatory peg.

Figure 5-6. Mentum (center) of Neochodaeus sp. and Xenochodaeus sp. Scale bar = 200 m. 5) More or less flat mentum of N. praesidii. 6) Longitudinally impressed mentum of X. americanus.