Deronectes, SHARP, 1882

Fery, H., P. N & S, East, 2013, Amurodytes belovi nov. gen. et nov. sp. from eastern Russia (Coleoptera, Dytiscidae, Hydroporinae), Linzer biologische Beiträge 45 (2), pp. 1821-1838 : 1832

Key to the Deronectes -group genera ( Deronectina )

The following key to genera is a modification of the key given by NILSSON & ANGUS (1992). It includes not only the new species, but also the genus Oreodytes, which was excluded from the Deronectina by NILSSON & ANGUS 1992), but – according to RIBERA (2004) and RIBERA et al. (2008) – must be included in this group.

1 Male pro- and mesotarsomeres 1-2 with distinct sucker cups. Pronotum sublaterally on each side with longitudinal stria........................................................................... Oreodytes

- Male pro- and mesotarsomeres 1-2 without distinct sucker cups, at most with sucking setae (trumpet-like). Pronotum sublaterally without longitudinal stria, at most with wrinkles...............................................................................................................................2

2 Dorsal surface uniformly ferrugineous (except in D. latus -group members, with anterior half of elytra slightly paler) to black. Metacoxal processes with interlaminary bridge exposed. Metatibia with anterior surface covered with spiniferous punctures. Metatarsomere 5 about twice as long as tarsomere 4 .......................................... Deronectes

- Elytra in most species vittate or maculate. Metacoxal processes with interlaminary bridge concealed or not. Anterior surface of metatibia with longitudinal row of spiniferous punctures or covered with small, non-spiniferous punctures; if covered with spiniferous punctures, then interlaminary bridge concealed. Metatarsomere 5 about 1.5 times as long as tarsomere 4................................................................................................3

3 Paramere apically without sclerotised hook. Elytron without subapical spine. Ventral surface densely punctate.....................................................................................................4

- Paramere apically with sclerotised hook. Elytron with subapical spine or not. Ventral surface densely punctate or shiny or microreticulate with sparse, coarse punctures.......... 7

4 Pronotum slightly cordiform. Metacoxal lines parallel. Antennomeres 5-10 flattened ventrally, especially in males semicircular in cross-section. Eastern Palaearctic genus (south-eastern Siberia and Far East of Russia).................................... Amurodytes nov.gen.

- Pronotum not cordiform 1. Metacoxal lines diverging anteriorly. Male antennomeres not semicircular in cross-section ........................................................................................ 5

5 Underside of head with area between eye and crease with punctures or strong sculpture .... ........................................................................................................................... Stictotarsus

- Underside of head with area between eye and crease without punctures or sculpture........6

6 Large punctures on elytra with one long seta................................................... Trichonectes

- Punctures on elytra simple ................................................................................ Boreonectes

7 Elytron without subapical spine. Ventral surface shiny and with sparse larger punctures .... ............................................................................................................................ Scarodytes