Austrelatus mimika, Shaverdo & Hájek & Hendrich & Surbakti & Panjaitan & Balke, 2023

Shaverdo, Helena, Hajek, Jiri, Hendrich, Lars, Surbakti, Suriani, Panjaitan, Rawati & Balke, Michael, 2023, Austrelatus gen. nov., a new genus of Australasian diving beetles (Coleoptera, Dytiscidae, Copelatinae), with the discovery of 31 new species from New Guinea, ZooKeys 1170, pp. 1-164 : 1

15. Austrelatus mimika sp. nov.

Figs 61 , 65 , 84

Type locality.

Indonesia: Papua Province: Mimika Regency, 04°30.330'S, 136°46.53'E, 24 m a.s.l.

Type material.

Holotype: male "Indonesia: Papua, Kabupaten Mimika, 24 m, 25-30.v.2017, 04°30.330'S, 136°46.53'E, B. Sumoked (Pap69-Bob07)" (MZB).

Paratypes: 2 males, 2 females with the same label as the holotype (KSP, ZSM).

Description.

Body size and form: Beetle small, with oblong-oval habitus (Fig. 61 ).

Measurements: TL 5.25-5.6 mm, TL-H 4.8-5.1 mm, MW 2.65-2.8 mm, TL/MW 1.96-2; PL 0.75-0.85 mm, PW 2.25-2.45 mm, PL/PW 0.33-0.35; DBE 0.9-0.95 mm, DBE/PW 0.38-0.4.

Holotype: TL 5.6 mm, TL-H 5.1 mm MW 2.8 mm, TL/MW 2; PL 0.85 mm, PW 2.45 mm, PL/PW 0.35; DBE 0.95 mm, DBE/PW 0.39.

Colouration: Dorsally piceous, with yellowish red head, pronotal sides, and on elytron with a basal band and apical spot connected with narrow lateral band (Fig. 61 ).

Head yellowish red, piceous narrowly behind eyes. Pronotum dark brown to piceous on disc (sometimes only small area) and paler towards sides, yellowish red on them. Elytron piceous, with a distinct yellowish red basal band, notched on posterior margin, not reaching suture and lateral margin, due to confluence of three spots on elytral base; elytron with a distinct, elongate, large apical spot connecting with a narrow lateral band. Scutellum yellow to brown. Antennae, other head appendages, and pro- and mesolegs proximally yellow, distally yellowish red; metalegs yellowish red, darker distally. Venter dark brown, with yellowish red prosternum. Teneral beetles paler.

Surface sculpture: Elytron with 11 distinct, complete dorsal striae; submarginal stria present: 11+1 (Fig. 61 ).

Head without strioles, with rather dense punctation (spaces between punctures 1-3 × size of punctures); punctures relatively fine (diameter of punctures equal to diameter of microreticulation cells); head with a row of coarse setigerous punctures along inner margin of each eye and a short row at frontal angle of each eye; a slightly longer puncture row forms fronto-clypeal depression at each head side; microreticulation weak. Pronotum with several strioles at posterior margin, mainly on sides; with numerous, fine longitudinal wrinkles at posterior margin; pronotal punctation finer and denser than on head; setigerous punctures form a row along pronotal margins, absent in posterior middle; disc of pronotum with indistinct longitudinal median scratch. Pronotum with fine microreticulation. Elytron with 11 distinct, complete dorsal striae; striae 1, 3, 5, 7, and 9 reduced shortly apically; submarginal striae present, strongly developed, reaching more than ½ of elytron. Elytron with fine punctation and microreticulation. Ventral part with fine, inconspicuous punctation, invisible on metaventrite and metacoxae and weak on abdominal ventrites; prosternum smooth medially; metaventrite and metacoxae with weak microreticulation; on abdominal ventrites microreticulation almost invisible; metacoxal plates with numerous, strongly impressed longitudinal strioles, abdominal ventrites 1 and 2 with numerous, long, longitudinal strioles from margin to margin, on abdominal ventrites 3 and 4 strioles situated laterally and turn to middle, almost horizontal, abdominal ventrites 5 and 6 without strioles but with fine punctation that very sparse medially and forms a dense, rugose lateral area at each side.

Structures: Head relatively broad. Pronotum short and broad; lateral margins distinctly convergent anteriorly. Base of prosternum broadly rounded anteriorly, convex medially; blade of prosternal process long, narrow, broadly pointed apically, convex in middle.

Male: Protibia straight, not modified. Proclaws rather short, subequal in length. Median lobe of aedeagus with two lobes of dorsal sclerite relative broad; left dorsal lobe as long as right one, with its lateral crest interrupted into apical and basal parts: apical crest short and lateral long and very broad; apex of left dorsal lobe strongly curved downwards and not to left; its dorsal surface with some surface sculpture but without distinct denticulation, it invisible in left lateral view due to strong curvature downwards; right dorsal lobe with indistinct, elongate median impression; apex of right dorsal lobe elongate, weakly “swollen”, rounded; lobes of ventral sclerite almost completely sclerotised, only with very narrow membranous areas medially; sclerotised area of left ventral lobe shorter than left dorsal lobe, broad, with large, angulate prolongation to left medially and with long, thin, hook-likely curved to left apex, well visible in lateral left and ventral views; right ventral lobe with large sclerotised area, flat, not protruding, only slightly covering medially left ventral lobe. Paramere with setae not divided into distal and proximal; more distally situated setae slightly denser and longer than more proximal ones (Fig. 65 ).

Female: As male.

Variability.

There is an insignificant variation in the body size and colouration.

Affinities.

For the body size, dorsal colouration, and elytral striolation, the species could be mistaken for A. kaszabi but it has completely different shape of the median lobe.

Etymology.

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

Distribution.

New Guinean endemic. Indonesia: Papua Province: Mimika Regency (Fig. 84 ).

Habitat.

The species was collected in stream-side puddles.

Figures

Figure 65. Austrelatus mimika sp. nov., median lobe A left lateral view B right lateral view C ventral view D left paramere in external view E right paramere in internal view. Scale bar: one unit - 0.1 mm (A-C).

Figure 84. Map of New Guinea showing distribution of 14 Austrelatus species.

Figures 58 - 61. Habitus and colouration of 58 Austrelatus baliem sp. nov. 59 A. kaszabi (Guignot, 1956), holotype 60 A. garainensis sp. nov. 61 A. mimika sp. nov.