Nematodes, Berthold, 1827

Otto, Robert L., 2021, A review of the Nearctic species of Nematodes (Coleoptera: Eucnemidae: Macraulacinae: Nematodini) with a description of one new species, Insecta Mundi 2021 (881), pp. 1-19 : 2-3

Key to the species of Nematodes in the Nearctic region

1. Femoral ridge well-developed, elongate, at least 1/2 the length of the hypomeral base................ 2

— Femoral ridge poorly-developed, short, about 1/3 the length of the hypomeral base ( Fig. 1 )............................................................................ N. collaris Bonvouloir

2. Femoral ridge incomplete, not reaching to the lateral side of the pronotum...................... 3

— Femoral ridge complete, reaching to the lateral side of the pronotum ( Fig. 2 )... N. humphreyi Muona

3. Femoral ridge reaching about 1/2 the length of the hypomeral base ( Fig. 3 ).......... N. atropos (Say)

— Femoral ridge reaching close to the lateral side of the pronotum ( Fig. 4, 5 )........................ 4

4. Antennomere V sub-equal to antennomere VI........................... N. penetrans (LeConte)

— Antennomere V shorter than antennomere VI....................... N. rugosipennis Otto sp. nov.

Figures

Figures 1–5. Nematodes species. 1) Nematodes collaris Bonvouloir, base of hypomeron. 2) Nematodes humphreyi Muona, base of hypomeron. 3) Nematodes atropos (Say), base of hypomeron. 4) Nematodes penetrans (LeConte), base of hypomeron. 5) Nematodes rugosipennis Otto sp. nov., base of hypomeron (Scale: 1–5 = 1.0 mm.)