Exocelina kabwumensis Shaverdo & Balke

Shaverdo, Helena, Sagata, Katayo & Balke, Michael, 2016, Taxonomic revision of New Guinea diving beetles of the Exocelinadanae group, with the description of ten new species (Coleoptera, Dytiscidae, Copelatinae), ZooKeys 619, pp. 45-102 : 67-69

Taxon classification Animalia Coleoptera Dytiscidae

10. Exocelina kabwumensis Shaverdo & Balke sp. n. Figs 5, 27

Exocelina undescribed sp. MB1285: Toussaint et al. 2014: supplementary figs 1-4, tab. 2.

Type locality.

Papua New Guinea: Morobe, Huon, Kabwum, 06°08.01'S; 147°11.34'E, 1600 m a.s.l.

Type material.

Holotype: male "Papua New Guinea: Morobe, Huon, 1 km SE Kabwum, 1600m, 16./17.v.2006, 06.08.007S 147.11.337E, Sagata (PNG 76)", "DNA M.Balke 1285" [green] (ZSM). Paratypes: 3 males, 3 females with the same labels as the holotype (NHMW, ZSM).

Diagnosis.

Beetle small to medium-sized; piceous, with reddish brown to brown head and pronotum laterally; matt, with strong punctation and microreticulation; male antennae simple; protarsomere 4 with weakly curved anterolateral “hook-like” (not modified into a hook) seta, smaller than more laterally situated large seta; median lobe narrow, with almost parallel sides and askew truncate apex in ventral view, with slightly curved apex and very few fine distal setae in lateral view; paramere with small notch on dorsal side. The species is very similar to Exocelina andakombensis sp. n., Exocelina injiensis sp. n., and Exocelina woitapensis sp. n., but differs from them in size, shape of the median lobe, and the presence of only few fine distal setae laterally on the median lobe.

Description.

Size and shape: Beetle small to medium-sized (TL-H 3.5-3.8 mm, TL 3.75-4.15 mm, MW 1.85-2.05 mm), with oblong-oval habitus, broadest at elytral middle. Coloration: as in Exocelina andakombensis sp. n. (Fig. 27).

Surface sculpture: As in Exocelina andakombensis sp. n.

Structures: Pronotum with distinct lateral bead. Base of prosternum and neck of prosternal process with distinct ridge, slightly rounded anteriorly. Blade of prosternal process lanceolate, relatively broad, slightly convex, and smooth, with distinct lateral bead and few lateral setae; neck and blade of prosternal process evenly jointed. Abdominal ventrite 6 slightly truncate or broadly rounded.

Male: Antennae simple. Protarsomere 4 with very small, weakly curved anterolateral “hook-like” (not modified into a hook) seta, smaller than more laterally situated large seta. Protarsomere 5 ventrally with anterior band of 27 and posterior row of 6 relatively long, thin setae (Fig. 5A). Median lobe narrow, with almost parallel sides and askew truncate apex in ventral view, with slightly curved, relatively broad apex and very few fine distal setae in lateral view (Figs 5 B–C). Paramere with small notch on dorsal side and with dense setae on subdistal part; proximal setae inconspicuous (Fig. 5D). Abdominal ventrite 6 with 8-10 lateral striae on each side.

Holotype: TL-H 3.65 mm, TL 4.0 mm, MW 2.0 mm.

Female: Without evident differences in external morphology from males, except for not modified pro- and mesotarsi and abdominal ventrite 6 without striae.

Distribution.

Papua New Guinea: Morobe Province. The species is known only from the type locality (Fig. 40).

Etymology.

The species is named after Kabwum Village. The name is an adjective in the nominative singular.