Exocelina sumokedi Shaverdo & Balke

Shaverdo, Helena, Sagata, Katayo & Balke, Michael, 2018, Introduction of the Exocelinacasuarina-group, with a key to its representatives and descriptions of 19 new species from New Guinea (Coleoptera, Dytiscidae, Copelatinae), ZooKeys 803, pp. 7-70 : 40

23. Exocelina sumokedi Shaverdo & Balke sp. n. Figs 11, 34

Type locality.

Papua: Puncak Regency, south from Iratoi, 03°16'48.6"S, 137°20'02.9"E, 150 m a.s.l.

Type material.

Holotype: male "Indonesia: Papua, S Iratoi, hunting camp, 150m, 28.v.2006, -3,2801742386 137,334125172346, local collectors" (MZB). Paratypes: 11 males, 13 females with the same label as the holotype (MZB, NHMW, ZSM). 6 males, 2 females "Indonesia: Papua, S Iratoi, river camp, 161m, 20./25.v.2006, -3,3522959 137,295029880478, local collectors" (NHMW, ZSM). 1 female "Indonesia: Papua, Rouaffer, Iratoi, hill in forest, 164m, 6.ix.2005, -3,2403086 137,3329744, local collectors" (ZSM).

Description.

Body size and form: Beetle small: TL-H 2.7-3.2 mm, TL 3.0-3.55 mm, MW 1.55-1.9 mm (holotype: TL-H 2.95 mm, TL 3.25 mm, MW 1.75 mm), with broader, oval habitus.

Coloration: Brownish, with head and pronotum paler. Head yellowish red to reddish brown in anterior half and brown to dark brown in posterior ones. Pronotum yellowish red to reddish brown on sides, brown to dark brown on disc. Elytra brown to dark brown, with narrow reddish sutural lines. Head appendages yellowish red, legs reddish, distally darker, especially metathoracic legs (Fig. 11). Teneral specimens paler.

Surface sculpture: Shiny dorsally. As in E. pusilla sp. n. but punctation finer and sparser and microreticulation weakly impressed.

Structures: Pronotum with lateral bead. Its lateral sides with shallow longitudinal impressions. Base of prosternum and neck of prosternal process with distinct ridge, rounded anteriorly. Blade of prosternal process lanceolate, relatively broad, slightly convex, with distinct lateral bead and few setae. Abdominal ventrite 6 broadly rounded or slightly truncate.

Male: Antennae simple (Fig. 11). Protarsomere 4 with medium-sized, thick, curved anterolateral hook-like seta. Protarsomere 5 long and narrow, with anterior row of 17 and posterior row of 6 relatively short setae (Fig. 34D). Median lobe in lateral view slightly curved, with thickened, not curved downwards apex; in ventral view, distinctly narrowed subdistally, with roundly truncate apex. Paramere slightly concave on dorsal side and with dense setae on subdistal part; proximal setae finer and sparser (Fig. 34 A–C). Abdominal ventrite 6 with 5-8 lateral striae on each side.

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

Affinities.

Exocelina sumokedi sp. n. is similar to E. pusilla sp. n. but is smaller, darker, more oval, shinier, with finer and sparser dorsal punctation and weaker microreticulation, with shallow longitudinal impressions on lateral sides of pronotum and different shape of the median lobe. The species is also similar to E. adelbertensis sp. n., E. bewani sp. n., E. cyclops sp. n., and E. pseudopusilla sp. n., see their “Affinities” and “Key”.

Distribution.

Papua: Puncak Regency. The species is known only from the Iratoi area (Fig. 50).

Etymology.

The species is named for our friend Bob Sumoked (Tomohon, Sulawesi). The species name is a noun in the genitive case.