Scaphisoma drescheri, Löbl, 2023

Löbl, Ivan, 2023, On the Scaphidiinae (Coleoptera: Staphylinidae) of Java, Indonesia, Acta Musei Moraviae, Scientiae biologicae 108 (1 - 2), pp. 1-34 : 10-11

Scaphisoma drescheri sp. nov.

( Figs 10, 11 )

Type material. Holotype male, G. Oengaran [= Ungaran] Java Drescher [printed] c. o Djomblans I 1936 500 m [handwritten] ( MBBJ).

Description. Length 1.95 mm, width 1.32 mm. Head and body dark reddish­brown, elytra becoming lighter apical, abdomen, femora, and tibiae lighter than thorax, tarsi, and antennae yellowish. Length/width ratios of antennomeres III 12 /9: IV 21 /7: V 40 /8: VI 50 /10: VII 55 /15: VIII 47 /11: IX 54 /15: X 53 /15: XI: 63/15. Pronotum and elytra lacking microsculpture. Pronotum with rounded lateral margins, lateral carinae concealed in dorsal view, lateral margin stria punctate, discal punctation fine, hardly visible at magnification 20 times, finer and sparser on centre than near basal and apical margins. Tip of scutellum exposed, triangular. Elytron rather weakly narrowed apicad, with lateral margin oblique posterior of basal third; lateral margin carina exposed in dorsal view; lateral margin stria impunctate; apical margin rounded; inner apical angle situated on level of outer apical angle; apical crenulation present; sutural margin raised; sutural stria deep, parallel with suture, curved at base to form basal stria extending to elytral basal width, adsutural area flat, about 0.09 mm wide near scutellum, finely punctate; discal punctation much coarser than that on pronotum, poorly delimited, puncture intervals mostly about as large to twice as large as puncture diameters. Hind wings fully developed. Hypomeron smooth. Venter of thorax lacking microsculpture. Mesanepisternum extremely finely and sparsely punctate. Mesepimeron about three times as long as wide, slightly shorter than interval between its tip and mesocoxa. Metaventrite coarsely and densely punctate on apicomesal area and on area between mesocoxae and metacoxae, several coarse punctures on lateral areas, very finely punctate on most of lateral surface and between mesocoxae; median area of metaventrite convex, with shallow apical impression, lacking stria; antecoxal puncture rows absent. Submesocoxal areas about 0.08 mm long, about as long as half of shortest interval to metacoxa; submesocoxal lines subtriangular, distinctly punctate. Metanepisternum flat, narrowing anteriad, with suture broadly rounded in posterior half, oblique anteriad. Tibiae straight. Abdomen with punctulate microsculpture and very fine and sparse punctation. Ventrite I with submetacoxal areas 0.06 0.08 mm long, about as long as third of shortest interval to apical margin of ventrite; submetacoxal lines strongly convex, finely punctate.

Male. Protarsomeres I to III distinctly widened, narrower than apex of protibia. Apical margin of ventrite VI with rounded lobe. Aedeagus ( Figs 10, 11 ) 0.51 mm long.

Etymology. The species is named in honour of its collector, Friederich Carl Drescher (1874 1957), who was affiliated to the Museum Zoologicum Bogoriense.

Differential diagnosis. The aedeagal characters suggest relationships with the species of the S. subalpinum group known currently from temperate areas of the northern hemisphere. The narrow median lobe with an acute, incurved tip, the narrow and nearly straight parameres and the proximally thickened internal sac are features shared with S. weigeli Löbl, 2019 from China and S. divali Löbl, 2023 from South India. The new species may be easily distinguished from S. weigeli and S. divali by the punctulate abdominal microsculpture. It differs also notably from S. weigeli by the parameral bases strongly expanded and from S. divali by the parameres narrowing posterior of basal third (lateral view).

Figures

Figs 8-13. Male genitalia. 8 – Scaphisoma bryanti sp. nov., aedeagus in dorsal view, scale = 0.2 mm. 9 – Ditto, in ventral view, without proximal part of basal bulb, scale = 0.1 mm. 10, 11 – Scaphisoma drescheri sp. nov., aedeagus in dorsal and lateral views, scale = 0.1 mm. 12, 13 – Scaphisoma multispinosum sp. nov., aedeagus in dorsal and lateral views, scale = 0.1 mm.