Exocelina jimiensis Shaverdo & Balke

Shaverdo, Helena, Sagata, Katayo, Panjaitan, Rawati, Menufandu, Herlina & Balke, Michael, 2014, Description of 23 new species of the Exocelinaekari-group from New Guinea, with a key to all representatives of the species group (Coleoptera, Dytiscidae, Copelatinae), ZooKeys 468, pp. 1-83 : 10

Taxon classification Animalia Coleoptera Dytiscidae

6. Exocelina jimiensis Shaverdo & Balke sp. n. Figs 10, 36

Exocelina undescribed sp. MB3311: Toussaint et al. 2014: Supplementary figs 1-4, Tab. 2.

Type locality.

Papua New Guinea: Western Highlands Province, Kundum, 05°16.10'S; 144°27.87'E.

Type material.

Holotype: male "Papua New Guinea: Western Highlands, Kundum, 1400m, 3.iii.2007, 05.16.096S 144.27.869E, Kinibel (PNG 142)" (ZSM). Paratypes: 64 males with the same labels as the holotype (NHMW, ZSM). 10 males "Papua New Guinea: Western Highlands, Simbai, Kairong River, 1850m, 2.iii.2007, 05.14.840S 144.28.457E, Kinibel (PNG 139)" (NHMW, ZSM). 20 males "Papua New Guinea: Western Highlands, Simbai - Jimi, 1500m, 2.iii.2007, 05.16.074S 144.27.886E, Kinibel (PNG 140)", one male additionally with a green label "DNA M.Balke 3311" (NHMW, ZSM). 2 males "Papua New Guinea: Western Highlands, Jimi, 1500m, 2.iii.2007, 05.16.335S 144.27.930E, Kinibel (PNG 141)" (ZSM). 8 males, 4 females "Papua New Guinea: Western Highlands, Jimi Valley, above Sendiap Station, 2000m, 6.iii.2007, 05.19.314S 144.31.266E, Kinibel (PNG 148)" (NHMW, ZSM). 7 males, 1 female "Papua New Guinea: Western Highlands, Simbai area, 2200m, 6.iii.2007, 05.18.752S 144.31.849E, Kinibel (PNG 149)" (NHMW, ZSM). 3 males, 3 females "Papua New Guinea: Western Highlands, Simbai area, 2500m, 8.iii.2007, 05.14.202S 144.33.651E, Kinibel (PNG 150)" (NHMW, ZSM).

Additional material.

33 females with the same labels as the holotype (ZSM). 38 females "Papua New Guinea: Western Highlands, Simbai, Kairong River, 1850m, 2.iii.2007, 05.14.840S 144.28.457E, Kinibel (PNG 139)" (ZSM). 10 females "Papua New Guinea: Western Highlands, Simbai - Jimi, 1500m, 2.iii.2007, 05.16.074S 144.27.886E, Kinibel (PNG 140)" (ZSM). 7 females "Papua New Guinea: Western Highlands, Jimi, 1500m, 2.iii.2007, 05.16.335S 144.27.930E, Kinibel (PNG 141)" (ZSM). These females might belong to two species: Exocelina jimiensis sp. n. and a species from the Exocelina broschii -group.

Diagnosis.

Beetle medium-sized, dark brown to piceous, with paler clypeus, vertex, and pronotal sides, slightly submatt; pronotum with distinct lateral bead; male antennomeres 3-5 evidently enlarged, slightly rounded, almost equal in size, external margin of antennomere 5 almost straight, antennomere 6 somewhat enlarged; male protarsomere 4 with large, slender, evidently curved anterolateral hook-like seta; median lobe with submedian constriction and apex bluntly pointed, broadened in lateral view; paramere with distinct notch on dorsal side and subdistal part elongate, with numerous, dense, more or less long, thin setae. The species is similar to Exocelina sandaunensis sp. n. and Exocelina simbaiarea sp. n., from which differs with stronger punctation on pronotum, male antennomeres 3-5 smaller and more equal in size, median lobe with stronger submedian constriction in ventral view and more broadened apex in lateral view, subdistal part of paramere with setae more numerous, shorter, and thinner.

Description.

Size and shape: Beetle medium-sized (TL-H 3.8-4.0 mm, TL 4.15-4.4 mm, MW 2.0-2.15 mm), with oblong-oval habitus, broadest at elytral middle. Coloration: Dorsal surface more or less uniform dark brown to piceous, paler on clypeus, vertex, pronotal sides, and along elytral suture; head appendages and legs yellowish red to dark reddish, legs darker distally (Fig. 36). Teneral specimens paler.

Surface sculpture: Head with dense, coarse punctation (spaces between punctures 1-3 times size of punctures). Pronotum with punctation finer than on head. Elytra with punctation finer, sparser than on pronotum. Pronotum and elytra with relatively weakly impressed microreticulation, dorsal surface slightly submatt. Head with microreticulation stronger. Metaventrite and metacoxa distinctly microreticulate, metacoxal figs with longitudinal strioles and transverse wrinkles. Abdominal ventrites with distinct microreticulation, strioles, and fine sparse punctation, coarser and denser on two last abdominal ventrites.

Structures: Pronotum with distinct lateral bead. Base of prosternum and neck of prosternal process and neck of prosternal process with distinct ridge, smooth and not rounded anteriorly, with small anterolateral extensions. Blade of prosternal process lanceolate, relatively narrow, convex, with distinct lateral bead and few setae; neck and blade of prosternal process evenly jointed. Abdominal ventrite 6 broadly rounded or slightly truncate apically.

Male: Antennomeres 3-5 evidently enlarged, slightly rounded, almost equal in size, external margin of antennomere 5 almost straight, antennomere 6 somewhat enlarged (Fig. 10A), antennomeres 3-6 rugose ventrally. Protarsomere 4 with large, slender, evidently curved anterolateral hook. Protarsomere 5 ventrally with anterior row of 13 and posterior row of 4 short setae (Fig. 10B). Abdominal ventrite 6 with 6-12 lateral striae on each side, slightly truncate apically. Median lobe with submedian constriction and apex bluntly pointed, broadened in lateral view (Fig. 10C, D). Paramere with distinct notch on dorsal side and subdistal part elongate, with numerous, dense, more or less long, thin setae (Fig. 10E).

Holotype: TL-H 3.9 mm, TL 4.25 mm, MW 2.15 mm.

Female: Antennae simple, abdominal ventrite 6 broadly rounded apically, without striae.

Distribution.

Papua New Guinea: Western Highlands Province. The species is known only from the area of Jimi River (Fig. 53).

Etymology.

The species is named after Jimi River, in the area in which it was collected. The name is an adjective in the nominative singular.