Baeoceroxidium inexspectatum, Löbl, 2023

Löbl, Ivan, 2023, On the Scaphidiinae (Coleoptera: Staphylinidae) of Java, Indonesia, Acta Musei Moraviae, Scientiae biologicae 108 (1 - 2), pp. 1-34 : 4-5

Baeoceroxidium inexspectatum sp. nov.

( Figs 1, 2 )

Type material. Holotype male, Java Mt. Gede , 1400 m, 25.V.66, Rougemont ( MHNG).

Description. Length 1.25 mm, width 0.77 mm, dorsoventral diameter 0.74 mm. Body dark brown, apical abdominal segments and appendages ochraceous to light brown. Length/width ratios of antennomeres III 18 /6: IV 20 /6: V 25 /7: VI 22 /7: VII 33 /13: VIII 19 /7: IX 35 /13: X 30/15: XI: 43/15. Pronotum with anterior margin bead broadly interrupted; lateral margins evenly rounded; lateral margin carinae distinct in dorsal view; lateral margin striae impunctate; discal punctation very fine, hardly visible at magnification 50 times, consisting of poorly delimited punctures; basal angles extending posterior of mesepimera level, overlapping anterior part of metanepisterna. Scutellum completely concealed. Elytron weakly narrowed apicad, with lateral margin slightly rounded, lateral margin carinae visible in dorsal view, lateral margin stria impunctate, sutural stria parallel to suture, curved at base and forming basal stria extending laterad and joined with lateral stria; adsutural area flat, with puncture row; discal punctation fine, much coarser than pronotal punctation, punctures clearly delimited, puncture intervals mostly about two to three times as large as puncture diameters. Hypomeron punctate. Mesoventrite with median, pentagonal ridge clearly delimited by line. Mesanepisternum smooth. Mesepimeron large, nearly reaching margin of mesocoxa, four times as long as wide. Metaventrite with median area nearly flat, densely and coarsely punctate except on small smooth area in middle; lateral parts of metaventrite extremely finely punctate; submesocoxal areas 0.02 mm long, margined by dense row of elongate punctures extending laterad along margin of mesepimeron. Metanepisternum large, 0.09 mm wide, with deep, impunctate suture. Tibiae straight. Abdomen very finely punctate, ventrite I with dense basal row of 0.02 mm long wrinkles shortly interrupted in middle.

Male. Protarsomeres I to III slightly widened. Aedeagus ( Figs 1, 2 ) 0.28 mm long.

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

Differential diagnosis. The species is readily distinguished from its congeners by the parameres lacking distinct setae. Besides, it is distinguished also by its significantly smaller body, the apical process of the median lobe narrow and weakly incurved, and the sclerite of the internal sac weakly sinuate and with an asymmetrical apex, in combination.

Figures

Figs 1-7. Male genitalia. 1, 2 – Baeotoxidium inexspectatum sp. nov., aedeagus in dorsal and lateral views, scale = 0.05 mm. 3-6 – Scaphicoma pattens sp. nov. 3, 4 – Aedeagus in dorsal and lateral views, scale = 0.1 mm. 5 – Ditto, internal sac in dorsal view, scale = 0.05 mm. 6 – Ditto, paramere in ventral view, scale = 0.05 mm. – 7 Scaphicoma ophthalmica (Achard), aedeagus in dorsal view, scale = 0.2 mm.