Scaphisoma activum, Lobl, 2015

Löbl, Ivan, 2015, On the Scaphidiinae (Coleoptera: Staphylinidae) of the Lesser Sunda Islands, Revue suisse de Zoologie 122 (1), pp. 75-120 : 98

Scaphisoma activum sp. nov.

Figs 72-73

Holotype: SMNS; ♂; Indonesia, W. Sumbawa Batudulang , 30 km S of Sumb. Besar, 1000 m Bolm lgt. 10. Febr. 1994.

Paratypes: SMNS, MHNG; 2 ♂, 2 ♀; with the same data as the holotype

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

Description: Length 1.45-1.60 mm, width 0.93-1.05 mm. Most of body reddish-brown to blackish-brown, head, apices of elytra, apex of abdomen, femora and tibiae lighter, antennae and tarsi almost yellowish. Pronotum and elytra lacking microsculpture. Antennae moderately long, length/width ratio of antennomeres as follows: III 12/9: IV 32/8: V 32/9: VI 35/9: VII 38/13: VIII 36/9: IX 39/12: X 42/12: XI 50/14. Antennomere III subtriangular. Pronotum very finely punctate, with lateral margins evenly rounded, lateral margin carinae not visible in dorsal view. Minute point of scutellum exposed. Elytra with lateral margin carinae exposed in dorsal view, apical margins truncate, inner apical angle rounded, not prominent, situated posterior level of outer angles, sutural margin not raised, sutural striae fairly shallow, parallel, at base somewhat curved, not extending laterad pronotal lobe, adsutural areas flat. Elytral punctation very fine near bases and along lateral margins, fairly coarse and dense on remaining discal surface, with punctures well delimited and puncture intervals mostly about 1.5 to 2 times as large as puncture diameters. Hypomera smooth. Mesepimera somewhat shorter than interval to mesocoxa. Metaventrite not microsculptured, with median area slightly convex, two very shallow apicomedian impression, punctation on apicomedian area fine but distinct, that on lateral areas very fine. Submesocoxal areas 0.05 mm, about as third of interval to metacoxa, submesocoxal lines convex, with very fine marginal punctures. Metanepisternum flat, narrowed anteriad, with inner margin rounded at angles, impressed below margin of metaventrite. Tibiae straight. Abdomen with microsculpture consisting of transverse striae, except on lateral parts of sternite 1 lacking microsculpture. Submetacoxal areas 0.07-0.09 mm, submetacoxal lines convex, with distinct margin punctures.

Male: Protarsal segments 1 to 3 hardly widened. Aedeagus (Figs 72-73) 0.38-0.40 mm. Median lobe and parameres symmetrical. Median lobe moderately sclerotized, with basal bulb somewhat longer than apical process, articular process not prominent, apical process tapering, arcuate, with concave ventral side and acute tip in lateral view, weakly narrowed and with blunt tip in dorsal view. Parameres slightly curved and gradually narrowed in dorsal view, oblique, strongly narrowed from base to middle third and evenly wide in distal two thirds in lateral view; with scattered pores. Internal sac lacking sclerites, with very fine spinose structures in apical half, membranes with scale-like structures in basal half.

Distribution: Indonesia: Sumbawa.

Type locality: W. Sumbawa Batudulang, 30 km S of Sumb. Besar, 1000 m.

Comments: The aedeagal characters suggest relationships with S. lombokense Löbl, 1986 . This new species may be readily distinguished by the comparatively longer basal bulb of the aedeagus, the internal sac with a central tuft of denticles, the elytra with sutural striae not extended along basal margins, the comparatively much coarser elytral punctation, and the larger submesocoxal areas.