Scaphisoma planatoides, Löbl, 2023

Löbl, Ivan, 2023, On the Scaphidiinae (Coleoptera: Staphylinidae) of Java, Indonesia, Acta Musei Moraviae, Scientiae biologicae 108 (1 - 2), pp. 1-34 : 16

Scaphisoma planatoides sp. nov.

( Figs 16, 17 )

Type material. Holotype male, Leg. H. LUCHT K.O. Blawan Idjen­Plateau , Java 900 1500 Ms. 5.II.1934 [printed, date handwritten] ( MBBJ).

Description. Length 2.26 mm, width 1.58 mm. Head, thorax, most of elytra and abdomen reddish brown. Apical fifth to fourth of elytra yellowish. Appendages reddish­brown, lighter than thorax. Length/width ratios of antennomeres III 20 /9: IV 33 /7: V 48 /9: VI 53 /13: VII 60 /18: VIII 55 /13: IX 60 /15: X 64 /16: XI: 80/17. Pronotum and elytra lacking microsculpture. Pronotum with rounded lateral margins, lateral carinae exposed in dorsal view, lateral margin stria punctate, discal punctation coarse and very dense, punctures poorly delimited, visible at magnification 15 times, puncture intervals to large part about puncture diameters. Tip of scutellum exposed, triangular. Elytron weekly narrowed apicad, with lateral margin rounded near base and apex, oblique in middle third; lateral margin carina exposed in dorsal view, except in middle third; lateral margin stria punctate; apical margin rounded; inner apical angle situated posterior of outer apical angle level; apical crenulation present; sutural margin not raised; sutural stria deep, posterior scutellum parallel with suture up to apical third of sutural length, curved near base and extending along basal margin to form shallow basal stria reaching elytral mid­width; adsutural area flat, near scutellum about 0.09 mm wide, punctate; discal punctation much coarser than that on pronotum, punctures well delimited, puncture intervals mostly about up to twice as large as puncture diameters. Hind wings fully developed. Hypomeron smooth. Mesanepisternum extremely finely and sparsely punctate, lacking microsculpture. Mesepimeron about three times as long as wide and about as long as interval between its tip and mesocoxa. Metaventrite with strigulate microsculpture on narrow area between metacoxae, lacking microsculpture on remaining surface, very finely and sparsely punctate on lateral areas and between mesocoxae; middle of metaventrite convex, densely and coarsely punctate, punctures sharply delimited; lacking stria, apicomesal area impressed; antecoxal puncture rows absent. Submesocoxal areas about 0.05 mm long, about as long as fifth of shortest interval to metacoxa; submesocoxal lines nearly convex, coarsely punctate. Metanepisternum flat, lacking microsculpture, narrowing anteriad, with suture straight except at rounded anterior angle. Tibiae straight. Abdomen with strigulate microsculpture and very fine and sparse punctation, similar to that on metaventral sides. Ventrite I with submetacoxal areas 0.03 mm long, about as long as tenth of shortest interval to apical margin of ventrite, submetacoxal lines parallel, coarsely punctate.

Male. Apical margin of ventrite VI subangulate, lacking distinct lobe. Aedeagus ( Figs 16, 17 ) 0.92 mm long.

Etymology. The species epithet derived from the Latin adjective planatus, referring to the expanded flattened apical process of the aedeagus, and the Greek oides meaning similar.

Differential diagnosis. The aedeagal characters of this new species suggest relationship with S. scurrile Löbl & Ogawa, 2016 from Palawan. Scaphisoma planatoides may be distinguished by the shape of the apical process of the median lobe narrowing proximally, the shape of the more robust and sclerotized internal sac, and, in external characters, by its larger body, the light apical area of the elytra, the longer antennae with the antennomere IV about 1.5 times as long as the antennomere III, the mesepimeron about as long as the interval to the mesocoxa, and the submesocoxal lines convex.

Figures

Figs 14-20. Male genitalia. 14, 15 – Scaphisoma neglectoides sp. nov., aedeagus in dorsal and lateral views, scale = 0.1 mm. 16, 17 – Scaphisoma planatoides sp. nov., aedeagus in dorsal and lateral views, scale = 0.2 mm. 18-20 – Scaphisoma posticum sp. nov. 18 – Aedeagus in dorsal view, scale = 0.1 mm. 19 – Ditto, paramere in ventral view, scale = 0.05 mm. 20 – Ditto, internal ac in dorsal view, scale = 0.05 mm.