Limbodessus, Guignot, 1939

Hendrich, Lars, Surbakti, Suriani & Balke, Michael, 2020, Limbodessus skalei sp. nov., a new diving beetle species from the west Papuan Archipelago (Coleoptera: Dytiscidae, Bidessini), Zootaxa 4763 (4), pp. 587-592 : 590

Modified key to Limbodessus from New Guinea (after Balke et al. 2016)

1. Base of elytral epipleuron with raised transverse carina delineating a basal pit, see fig. 36 (widespread in the Australasian region; ventral aspect as in fig. 28, with metaventrite and metacoxae rather smooth; male genital as in figs 32, 33................................................................................. Limbodessus compactus (Clark, 1862)

- Base of elytral epipleuron without raised transverse carina delineating a basal pit as in fig. 38......................... 2

2. Elytral plica present................................................................................... 3

- Elytral plica absent.................................................................................... 4

3. Larger species (TL=2.6–3.0 mm), mainly yellowish without distinct markings on elytra, metacoxa and metaventrite covered with few larger punctures. Short range endemic of the Baliem Valley of Papua ...................................................................................................... Limbodessus baliem Balke & Hendrich, 2016

- Smaller species (TL=2.0– 2.05 mm), mainly yellowish with distinct markings on elytra, metacoxa and metaventrite covered with numerous larger punctures. Endemic to the island of Waigeo.......................... Limbodessus skalei sp. nov.

4. Beetle dark brown to blackish; only known from high altitude grassland of the range north of Sugapa, Papua ........................................................................... Limbodessus alexanderi Balke & Hendrich, 2016