Scaphisoma adjunctum, Lobl, 2015

Löbl, Ivan, 2015, On the Scaphidiinae (Coleoptera: Staphylinidae) of the Lesser Sunda Islands, Revue suisse de Zoologie 122 (1), pp. 75-120 : 94-95

Scaphisoma adjunctum sp. nov.

Fig. 63-65

Holotype: SMNS; ♂; Indonesia, Lombok Is. Senaro N slope of Rinjani 2.-5.Feb.1994 Bolm lgt. 1100 m.

Paratypes: SMNS, MHNG; 2 ♀; with the same data as the holotype. – MHNG; 2 ♀; Lombok Mt. Rinjani ca 400 m nr. Waterfalls, 5.XI.91 Löbl, veg. debris nr. river. – MHNG; 2 ♀; Indo: Lombok Batu Koq-G.Rinjani 1200 m, sec. montane for. on slope, in ravine D. Agosti, 13.3.91.

Etymology: The species epithet is a Latin adjective, meaning added.

Description: Length 1.42-1.60 mm, width 0.92-1.02 mm. Head and most of body reddish-brown, apical third of elytra, apical abdominal segments and appendages lighter, yellowish-brown. Pronotum and elytra not microsculptured. Antennae long, length/width ratio of antennomeres as follows: III 15/8: IV 37/6: V 47/7: VI 42/6: VII 48/12: VIII 39/8: IX 50/12: X 47/13: XI 58/14. Antennomere III subtriangular. Pronotum very finely punctate, punctures dense, not well delimited, lateral margins evenly rounded, lateral margin carinae not visible in dorsal view. Point of scutellum exposed. Elytra with lateral margin carinae visible near bases in dorsal view, apical margins truncate, inner apical angle rounded, not prominent, situated posterior level of outer angles, sutural margin slightly raised, sutural striae deep, weakly converging apically, not or hardly curved at base and not extending laterad pronotal lobe, adsutural areas flat. Elytral punctation fairly coarse, with punctures fairly well delimited, puncture intervals mostly about 1.5 to 2 times as large as puncture diameters. Hypomera smooth. Mesepimeron about as long as two thirds of interval to mesocoxa, about 4 times as long as wide. Metaventrite not microsculptured, flat in middle, with mesal groove and two fairly deep, elongate apicomedian impressions; punctation almost even, very fine and sparse. Submesocoxal areas 0.05 mm, about as two thirds of interval to metacoxa, submesocoxal lines convex, with fine marginal punctures. Metanepisterna flat, below level of metaventrite, narrowed anteriad, with inner margin straight, rounded at angles. Tibiae straight. Abdomen very finely punctate, with striate microsculpture. Sternite 1 with submetacoxal areas 0.05-0.06 mm, as long as half of interval to apical margin, submetacoxal lines strongly convex, with distinct margin punctures.

Male: Tarsomeres 1 to 3 of protarsi slightly widened. Aedeagus (Figs 63-65) 0.36 mm long, asymmetrical, weakly sclerotized. Median lobe with basal bulb small, much shorter than apical process, articular process robust. Apical process narrow, strongly inflexed, parallel-sided and with blunt apex in dorsal view, tapering, with pointed apex, and most of ventral side oblique in lateral view. Parameres asymmetrical, almost straight, right paramere widest before middle, with shallow subapical notch, left paramere widest posterior mid-length, irregularly narrowed apically. Internal sac lacking flagellum or other sclerotized pieces, membranes lacking obvious denticulate or scale-like structures.

Distribution: Indonesia: Lombok.

Type locality: Lombok, Senaro, N slope of Rinjani, 1100 m.

Comments: This species shares with S. ablutum the mesally grooved and apicomesally impressed metaventrite. These two species resemble also by the colour pattern of the elytra, and both have asymmetrical median lobe. They may be easily distinguished by the size of their body, significantly larger in S. ablutum . Scaphisoma adjunctum is characterized by the unique shape of the parameres.