Scaphoxium dentatum, Löbl, 2023

Löbl, Ivan, 2023, On the Scaphidiinae (Coleoptera: Staphylinidae) of Java, Indonesia, Acta Musei Moraviae, Scientiae biologicae 108 (1 - 2), pp. 1-34 : 29-30

Scaphoxium dentatum sp. nov.

( Figs 34 36 )

Type material. Holotype male, JAVA: W. Java Cibodas , 50 km E Bogor , 1400 m, 3 6.XI.1989, Agosti, Löbl, Burckhardt #2a ( MBBJ). Paratypes, 2 males, 1 female, with same data as the holotype ( MBBJ, MHNG).

Description. Length 1.25 1.35 mm, width 0.62 0.67 mm, dorsoventral diameter 0.60 0.75 mm. Head and body dark reddish­brown, apex of abdomen yellowish, femora and tibiae reddish­brown, tarsi yellowish, antennomeres I to VI yellowish, antennal club light brown. Length/width ratios of antennomeres as: III 24 /6: IV 18 /6: V 30 /6: VI 26 /6: VII 41 /9: VIII 27 /8: IX 45 /9: X 38 /10: XI 46 /10. Pronotum very finely punctate. Scutellum concealed. Elytral punctation nearly as fine as pronotal punctation, hardly visible at 30 times magnification, sutural striae starting about 0.10 mm posteriad of pronotal lobe. Hypomeron punctate, with short oblique stria, upper anterior part swollen. Mesoventrite impunctate, lacking microsculpture and without mesal ridge. Mesoventral process impressed, with two very low and short carinae, slightly notched. Metaventrite lacking microsculpture, very finely punctate, convex in middle; submesocoxal lines convex, punctate; submesocoxal areas about 0.04 mm long, about as long as half of shortest interval between them and apical metaventral margin. Metanepisternum flat, parallel­sided, with suture impunctate, slightly shortened. Abdomen very finely punctate, ventrites I to IV lacking obvious microsculpture, apical ventrites with punctulate microsculpture.

Male. Protarsomeres I to III hardly widened. Aedeagus ( Figs 34 36 ) 0.70 0.77 mm long.

Etymology. The species epithet is a Latin adjective meaning dentate.

Differential diagnosis. This new species may be readily distinguished from S. corporaali by the metaventrite lacking patches of coarse punctures. The shape of the parameres bearing an elongate subapical lobe narrowing to tip is shared with S. simulans Löbl, 1971 from Sri Lanka, S. sparsum Löbl, 1979 from India, Nepal and Thailand, S. intermedium Löbl, 1984 reported from India, Thailand and China, and S. hartmanni Löbl, 2001 from Nepal. The new species is distinguished from them by the internal sac bulbous basally and lacking rods or other sclerotized structures.

Figures

Figs 28-36. Male genitalia. 28, 29 – Scaphobaeocera spinigeroides sp. nov, aedeagus in dorsal and lateral views, scale = 0.1 mm. 30 – Scaphobaeocera truncata sp. nov., aedeagus in lateral view. 31-33 – Scaphoxium corporaali sp. nov. 31 - Aedeagus in dorsal view, scale = 0.1 mm. 32 – Ditto, internal sac, scale = 0.1 mm. 33 Ditto, paramere in ventral view, scale = 0.1 mm. 34-36 – Scaphoxium dentatum sp. nov. 34 - Aedeagus in dorsal view, scale = 0.1 mm. 35 – Ditto, internal sac, scale = 0.05 mm. 36 – Ditto, paramere in ventral view, scale = 0.1 mm.