Exocelina tsinga, Shaverdo & Surbakti & Sumoked & Balke, 2020

Shaverdo, Helena, Surbakti, Suriani, Sumoked, Bob & Balke, Michael, 2020, Two new species of the Exocelina ekari group from New Guinea with strongly modified male antennae (Coleoptera, Dytiscidae, Copelatinae), ZooKeys 960, pp. 63-78 : 63

publication ID	https://dx.doi.org/10.3897/zookeys.960.55007
publication LSID	lsid:zoobank.org:pub:53E72CF9-515F-47E4-9350-F123BC2D8442
persistent identifier	https://treatment.plazi.org/id/F1184304-DE9D-45AA-936E-17300B34EF25
taxon LSID	lsid:zoobank.org:act:F1184304-DE9D-45AA-936E-17300B34EF25
treatment provided by	ZooKeys by Pensoft
scientific name	Exocelina tsinga
status	sp. nov.

Treatment

Exocelina tsinga sp. nov. Figures 5 View Figure 5 , 6 View Figure 6 , 7 View Figure 7 , 8B View Figure 8 , 9B View Figure 9 , 10 View Figure 10 , 11 View Figure 11

Type locality.

Indonesia: Papua Province, Mimika Regency, Tsinga Village, Tsingogong River, 04°11.320'S, 137°16.364'E, 1,306 m a.s.l.

Type material.

Holotype: male "Indonesia: Kabupaten [Regency] Mimika, Desa [Village] Tsinga, Sungai [River] Tsingogong", "1306 m, 25-30.v.2017, 04°11.320'S, 137°16.364'E, B. Sumoked" (MZB). Paratypes: 33 males, 38 females with the same label as the holotype (MZB, KSP). 6 males, 7 females "Indonesia: Kabupaten Mimika, Desa Tsinga, 1381 m, 25-30.v.2017", " 04°11.379'S, 137°13.456'E, B. Sumoked" (MZB, KSP).

Description.

Body size and form: Beetle medium-sized: TL-H 4.05-4.8 mm, TL 4.5-5.3 mm, MW 2.15-2.5 mm (holotype: TL-H 4.5 mm, TL 5 mm, MW 2.4 mm), with oblong-oval to elongate habitus (Fig. 5 View Figure 5 ).

Colouration: As in E. athesphatos sp. nov.

Surface sculpture: As in E. athesphatos sp. nov.

Structures: Pronotum with distinct, relatively narrow anteriorly 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, with distinct lateral bead and few setae. Abdominal ventrite 6 broadly rounded or slightly truncate.

Male: Antenna strongly modified (Figs 5 View Figure 5 , 8B View Figure 8 ): antennomere 2 strongly reduced, antennomeres 3 and 4 strongly enlarged (antennomere 3 the largest), antennomeres 5 and 6 distinctly enlarged, antennomeres 7-9 stout. Pro- and mesotarsomeres 1-3 dilated. Protarsomere 4 slightly dilated, with anterolateral angle shortly expanded and with large, thick, slightly curved anterolateral hook-like seta. Protarsomere 5 ventrally with anterior row of 14 and posterior row of 6 short, thick, pointed setae (Fig. 7B View Figure 7 ). Median lobe relatively long and slender, with slightly discontinuous outline in subapical part (mainly visible in ventral view); in lateral view, apex thin, more or less pointed and curved downwards; in ventral view, apex broad, almost truncate (Fig. 6 View Figure 6 ). Paramere with very deep dorsal notch, separating subdistal part; subdistal part is large, broad, curved downwards and pressed closely to paramere, with fringe of seven very broad, flattened setae; proximal setae numerous, dense, thin, much more inconspicuous than subdistal (Fig. 7A View Figure 7 ). Abdominal ventrite 6 slightly depressed medially, with 10-12 lateral striae on each side (Fig. 9B View Figure 9 ).

Female: Antennae and pro- and mesotarsi not modified. Abdominal ventrite 6 without depression and lateral striae.

Affinities.

About the placement within the E. ekari group, we consider the species in the same way as E. athesphatos sp. nov. Both species are very similar in external morphology (colouration, body form and sculpture, shape of male antennae) and, therefore, difficult to distinguish without detailed study (Figs 1 View Figure 1 , 5 View Figure 5 ). However, males antennomeres of E. tsinga sp. nov. are slightly smaller than in E. athesphatos sp. nov. and have slightly different form (Fig. 8 View Figure 8 ). The species can be easily separated by the shape of abdominal ventrite 6 (Fig. 9 View Figure 9 ), median lobe and paramere.

Distribution.

Indonesia: Papua Province, Mimika Regency. The species is known only from the type locality.

Habitat.

The specimens were collected from small puddles on bedrock (Fig. 11 View Figure 11 ), besides fast flowing mountains streams (such as Tsingogong River in Fig. 10 View Figure 10 ).

Etymology.

The species is named after Tsinga Village. The name is a noun in the nominative singular standing in apposition.