Scaphisoma edentatum, Löbl, 2012

Löbl, Ivan, 2012, On a collection of Scaphisomatini (Coleoptera: Staphylinidae: Scaphidiinae) from West Malaysia, Acta Entomologica Musei Nationalis Pragae 52 (1), pp. 173-184 : 179-181

Scaphisoma edentatum sp. nov.

( Figs. 11–14 )

Type material. HOLOTYPE ♂: ‘ MALAYSIA, Pahang Cameron Highlands Tanah Rata vill. env. Gunung Jasat [Mt.] ; 1470–1705 m 04°28.4–7’ N, 101°21.6–22.1’ E Jiří Hájek leg. 18.iv.–10.v.2009 ’ ( NMPC). PARATYPES: 2 ♂♂, with the same data as the holotype ( NMPC, MHNG).

Description. Length 1.55–1.63 mm, width 1.02–1.11 mm. Head and body blackish-brown to black, apices of elytra, apex of abdomen and appendages light, ochraceous or yellowish. Antennomeres VII to XI hardly darker than preceding segments. Length ratio of antennomeres as: II 9: III 4: IV 8: V 15: VI 15: VII 18: VIII 14: IX 20: X 19: XI 21 (holotype). Segments V and VI narrow, only slightly wider than segment IV and each about 6 times as long as wide. Segments VII and VIII each about 4.5 times as long as wide. Segment XI as wide as segment VII, 5 times as long as wide. Pronotum with lateral margins weakly rounded, almost oblique near base, lateral margin carinae visible near base in dorsal view, punctation dense and fine, consisting of fairly well delimited punctures becoming clearly larger and more dense on basolateral area, some punctures near basal margin about as large as puncture intervals. Tip of scutellum exposed. Elytra moderately narrowed apically, with rounded lateral margins, lateral margin carinae throughout visible in dorsal view, apical margins rounded, lacking serration, inner apical angle situated posterior to level of outer apical angles, sutural margin not raised, adsutural area flat, with single puncture row, sutural striae shortened, starting behind level of scutellum, converging apically; basal striae absent; discal punctation coarse, consisting of deep, well delimited punctures to large part arranged to form longitudinal rows, smallest intervals between punctures about as puncture diameters. Hypomera with striate microsculpture. Mesepimera about twice as long as interval to mesocoxae. Metaventrite microsculptured, in middle weakly convex, lacking impressions, coarsely punctate. Submesocoxal lines parallel, coarsely punctate, submesocoxal areas about 0.03 mm long. Lateral parts of metaventrite very finely punctate, with impressed row of antemetacoxal punctures. Metepisterna flat, with inner suture arcuate, at widest point 0.10 mm, narrower anteriad than posteriad. Exposed abdominal ventrites very finely punctate, with striate microsculpture; ventrite 1 with subcoxale lines moderately arcuate, subcoxale areas 0.05 mm long. Tibiae straight, evenly narrow.

Male. Segments 1 to 3 of protarsi slightly widened. Median process of abdominal ventrite 6 triangular, about 0.04 mm long. Aedeagus ( Figs. 11–14 ) 0.58–0.68 mm long, symmetrical, fairly strongly sclerotized. Apical process of median lobe strongly inflexed, slightly curved and tapering, about as long as basal bulb. Parameres gradually narrowed toward mid-length and arcuate in dorsal view, each with large lobe. Internal sac with lateral rows of dense spines, and conspicuously long, spiral basal part, lacking sclerotized plates or tooth-like structures.

Differential diagnosis. This species is a member of the Scaphisoma rouyeri group. Its aedeagal characters are similar to those in S. delictum Löbl, 1981 , S. pseudodelictum Löbl, 1986 and S. malignum Löbl, 1986 . It may be distinguished from these species by the lobes of the parameres extended basally, and not restricted onto the mesal section, and differs from S. delictum and S. pseudodelictum by the evenly narrow and curved apical part of the parameres (see also LÖBL 1986), and the long lateral spine-like structures of the internal sac. In addition, the body of B. edentatum is notably darker than that in the allied species.

Etymology. The name is a Latin adjective, referring to the absence of robust, teeth-like structures in the internal sac.

Figures

Figs. 10–12. 10 – Scaphisoma longiusculum sp. nov., internal sac in dorsal view, scale bar = 0.1 mm. 11–12 – Scaphisoma edentatum sp. nov.: 11 – aedeagus in dorsal view, scale bar = 0.2 mm; 12 – internal sac in dorsal view, scale bar = 0.1 mm.

Figs. 13–15. 13–14 – Scaphisoma edentatum sp. nov.: 13 – aedeagus in lateral view, scale bar = 0.2 mm; 14 – internal sac in lateral view, scale bar = 0.1 mm. 15 – Toxidium lunatum sp. nov., aedeagus in dorsal view, scale bar = 0.2 mm.