Scaphisoma antennarum, Lobl, 2015

Löbl, Ivan, 2015, On the Scaphidiinae (Coleoptera: Staphylinidae) of the Lesser Sunda Islands, Revue suisse de Zoologie 122 (1), pp. 75-120 : 101

Scaphisoma antennarum sp. nov.

Figs 78-79

Holotype: SMNS; ♂; Indonesia, Lombok Is. Sapit- Sembalun Bumbung 14-16 Feb.1994 Bolm lgt. 900- 1500 m.

Paratypes: SMNS, MHNG; 6 ♂, 1 ♀; with the same data as the holotype. – SMNS; 1 ♀; Indonesia E. Lombok Sapit , 14.- 16.2.1994 SE slope of Mt. Rinjani Bolm lgt.

Etymology: The species epithet is a Latin adjective, referring to the antennae.

Description: Length 1.35-1.50 mm, width 0.96-1.06 mm. Head and body dark reddish-brown to blackishbrown. Elytra eventually darkened apically, except for narrowly light apices. Apical abdominal segments and appendages light reddish to yellowish. Pronotum and elytra lacking microsculpture. Antennae short, length/ width ratio of antennomeres as follows: III 10/10: IV 15/8: V 22/9: VI 27/12: VII 42/14: VIII 26/11: IX 40/12: X 38/16: XI 50/16. Antennomere III subtriangular. Pronotum very finely punctate, lateral margins evenly rounded, lateral margin carinae not visible in dorsal view. Point of scutellum exposed. Elytra with lateral margin carinae visible in dorsal view, apical margins weakly convex, inner apical angle rounded, not prominent, situated posterior level of outer angles, sutural margin not raised, sutural striae fairly shallow, parallel, somewhat curved at base, not extending laterad pronotal lobe, adsutural areas flat. Punctation very fine and sparse on basal fourth to third of elytra, becoming less fine and denser apically, punctures on apical halves of elytral disc well delimited, to part about as large as puncture intervals. Hypomera smooth. Mesepimeron about as long as interval to mesocoxa. Metaventrite not microsculptured, lacking mesal impressions or sulci, punctation very dense and fine on apicomedian area, with punctures to part as large as intervals, finer and sparser on anteriomedian and lateral areas. Submesocoxal areas 0.04-0.05 mm, as long as fourth of interval to metacoxa, submesocoxal lines convex, with very fine marginal punctures. Metanepisternum flat, slightly narrowed toward angles, with inner margin weakly sinuate, impressed below margin of metaventrite. Tibiae straight. Abdomen lacking obvious microsculpture, pygidium conspicuously punctured, with punctures dense, about as large as puncture intervals, sternites very finely and sparsely punctured, excepted on median part of sternite 1 with denser punctures, similar to those on apicomedian part of metaventrite. Submetacoxal areas 0.12-0.13 mm, about twice as shortest interval to apical margin of sternite, submetacoxal lines strongly convex, with fine margin punctures.

Male: Protarsal segments 1 to 3 hardly widened. Aedeagus (Figs 78-79) 0.23-0.27 mm long. Median lobe strongly sclerotized, slightly asymmetrical, with basal bulb small, bearing comparatively large articular process. Apical process much longer than basal bulb, narrow, tapering, in dorsal view weakly curved, in lateral view arcuate basally, straight in apical half. Parameres fairly narrow, dorsally widened at apices. Internal sac with hardly visible flagellum, membranes lacking denticulate or scale-like structures.

Distribution: Indonesia: Lombok.

Type locality: Lombok, Sapit-Sembalun Bumbung, 900-1500 m.

Comments: The aedeagus in the new species is similar to that in S. besucheti Löbl, 1971 from Sri Lanka, though it is significantly smaller. These two species may be readily distinguished also by their antennae, the elytra lacking basal striae in S. antennarum , and the much smaller submetacoxal areas in S. besucheti .