Scaphisoma aequum, Lobl, 2015

Löbl, Ivan, 2015, On the Scaphidiinae (Coleoptera: Staphylinidae) of the Lesser Sunda Islands, Revue suisse de Zoologie 122 (1), pp. 75-120 : 95-97

Scaphisoma aequum sp. nov.

Fig. 66-67

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

Paratypes: SMNS, MHNG; 2 ♂, 4 ♀; with the same data as the holotype.

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

Description: Length 1.75-1.80 mm, width 1.12-1.15 mm. Head and most of body uniformly dark reddish-brown to black. Elytron with light reddish subapical band, narrow area posterior band usually reddish-brown, lighter than most of elytra and pronotum. Abdomen, femora and tibiae almost evenly reddish-brown, or sternite 1 darkened, almost as dark as metaventrite. Tarsi and antennae slightly lighter than tibiae. Pronotum and elytra lacking microsculpture. Antennae long, length/width ratio of antennomeres as follows: III 12/8: IV 40/6: V 50/7: VI 45/7: VII 53/10: VIII 45/8: IX 52/13: X 50/13: XI 55/14. Antennomere III subtriangular. Pronotum very finely punctate, with lateral margins evenly rounded, lateral margin carinae not visible in dorsal view. Point of scutellum exposed. Elytra with lateral margin carinae entirely or partly 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 deep, converging apically, at base hardly curved, not extending laterad pronotal lobe, adsutural areas flat. Elytral punctation sparse and fine near base, fairly coarse and dense on remaining surface. Hypomera smooth. Mesepimera about as long as interval to mesocoxa. Metaventrite very finely punctate, not microsculptured, with median part flattened, conspicuous mesal groove reaching anterior margin, and two small, shallow apicomedian impressions. Submesocoxal areas 0.06- 0.07 mm, about as long as half of interval to metacoxa, submesocoxal lines convex, with very fine marginal punctures. Metanepisternum flat, narrowed apically, with inner margin oblique, impressed below margin of metaventrite. Tibiae straight. Abdomen very finely punctate, with microsculpture consisting of transverse striae. Submetacoxal areas 0.06-0.07 mm, submetacoxal lines convex, with distinct margin punctures.

Male: Protarsal segments 1 to 3 hardly widened. Aedeagus (Figs 66-67) 0.37-0.40 mm long. Median lobe asymmetrical, weakly sclerotized. Basal bulb moderately large, articular process not prominent. Apical process almost in axis with basal lobe, weakly narrowed apically and with blunt tip in dorsal view, arcuate, abruptly narrowed posterior membranous fold and with tip acute in lateral view. Parameres asymmetrical, irregularly bent in dorsal view, with inner margin weakly sclerotized in apical thirds, almost evenly arcuate and narrow in lateral view. Internal sac with very narrow flagellum, surrounded by membranes.

Distribution: Indonesia: Sumbawa.

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

Comments: The species shares many aedeagal characters with S. adjunctum . It may be easily distinguished from the latter by the larger body size, colour and punctation of the elytra, and by the shape of the parameres.