Exocelina herowana 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 : 8-10

Taxon classification Animalia Coleoptera Dytiscidae

5. Exocelina herowana Shaverdo & Balke sp. n. Figs 5, 33

Type locality.

Papua New Guinea: Simbu/Eastern Highlands Provinces, Crater Mt., Sera - Herowana, upper Oh River, approximately 06°43.4'S; 145°05.6'E.

Type material.

Holotype: male "Papua New Guinea: Crater Mountain, Sera - Herowana, upper Oh river, 1200m, 15IX2002, Balke & Sagata, (PNG 012)", "DNA M.Balke 6181" (ZSM).

Diagnosis.

Beetle small, dark brown, with slightly paler head and pronotum, shiny; pronotum with lateral bead; male antennomeres 3-9 stout, with 4-5 slightly larger than other antennomeres; male protarsomere 4 with large slender, evidently anterolateral hook-like seta; median lobe with very strong median constriction and proximal part very broad in ventral view, apex of median lobe broad, slightly concave in middle and twisted at both sides in ventral view and shortly pointed in lateral view; paramere with distinct notch on dorsal side and subdistal part elongate, with a large brush of long, dense, thin setae; proximal setae almost invisible. The species is similar to Exocelina edeltraudae and Exocelina pseudoedeltraudae sp. n., from which differs with smaller size and stout, not evidently modified, male antennomeres.

Description.

Size and shape: Beetle small (TL-H 3.6 mm, TL 4.0 mm, MW 2.0 mm), with oblong-oval habitus, broadest at elytral middle. Coloration: Head and pronotum reddish-brown, pronotal disc brown; elytra dark brown; head appendages yellowish-brown, legs reddish-brown, darker distally (Fig. 33).

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

Structures: Pronotum with lateral bead. Base of prosternum and neck of prosternal process with distinct ridge, smooth and slightly rounded anteriorly, without 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.

Male: Antennomeres 3-9 stout, with 4-5 slightly larger than other antennomeres (Fig. 5A). Protarsomere 4 with large, slender, evidently curved anterolateral hook-like seta. Protarsomere 5 ventrally with anterior row of 12 setae and posterior row of 4 short setae (Fig. 5B). Abdominal ventrite 6 with 8-10 lateral striae on each side. Median lobe with very strong median constriction and proximal part very broad in ventral view, apex of median lobe broad, slightly concave in middle and twisted at both sides in ventral view and shortly pointed in lateral view (Fig. 5C, D). Paramere with distinct notch on dorsal side and subdistal part elongate, with a large brush of long, dense, thin setae; proximal setae almost invisible (Fig. 5E).

Female: Unknown.

Distribution.

Papua New Guinea: Simbu/Eastern Highlands Provinces. This species is known only from the type locality (Fig. 53).

Etymology.

The species is named after the type locality. The name is a noun in the nominative singular standing in apposition.