Bironium maindai, Löbl, 2021

Löbl, Ivan, 2021, A review of the Bironium Csiki, 1909 (Coleoptera: Staphylinidae: Scaphidiinae) of New Guinea and the Moluccas, Acta Musei Moraviae 106 (2), pp. 227-248 : 237-238

Bironium maindai sp. nov.

( Figs 22 -25)

Type material. Holotype ♂: WEST PAPUA : Foja Mountains mosses and leaves, forest stream, 200 m 2°27′32.37′′S 138°46′30.19′′E leg. Tobias Mainda 28.05. ( MHNG). Paratype ♂, with the same data as the holotype ( MHNG).

Description. Length 1.47- 1.60 mm, width 0.83- 0.90 mm. Head and body black, legs ochraceous, tibiae and tarsi lighter than femora, antennae light brown. Pronotum very finely punctate. Scutellum triangulate. Elytra lacking humeral humps; adsutural areas flat; sutural and lateral striae impunctate; basal striae deep, shortly interrupted at level of humeral areas, discal punctation about as fine as pronotal punctation, hardly visible at 100 times magnification. Mesoventrite convex, appearing impunctate, not microsculptured, with short ridge present only on paxillum, few very shallow striae between mesocoxal cavities. Median part of metaventrite hardly convex, with anterior margin conspicuously impressed below margin of mesoventrite, lacking obvious longitudinal striae, not microsculptured, with pair of coarse punctures in centre; metacoxal process horizontal, with margin shallowly notched in middle, lateral notches deeper and narrower than median notch. Lateral parts of metaventrite lacking coarse punctures. Submesocoxal lines with a few coarse punctures. Metanepisterna evenly, about 0.03 mm wide. Metanepisternal suture impunctate, curved posteriad, nearly reaching margin of metepimeron. Ventrites lacking microsculpture. Ventrite Iwithout basomedian hump, with few rather fine punctures along basal margin. Protarsomeres lacking prominent ventral lobe.

♂: Protarsomeres Ito III hardly widened, similar in width, protarsomere Islightly wider than half of protibial apex. Protarsomere III about as long as following two tarsomeres combined, with apicoventral pair of long setae of not widened. Aedeagus as Figs 22 -25, 0.59 mm long.

Distribution. Indonesia: Papua .

Etymology. The species is named in honour of its collector, Tobias Mainda (Nauen, Germany).

Comments. This species may be readily distinguished from the remaining species by its small body­size. It is also characterized by the reduced ridge of the mesoventrite in combination with the metaventrite lacking striae. The shape of the parameres, as seen in ventral view, with angulate inner margin posterior of narrowed basal section, is also diagnostic for the species.

Figures

Figs 20-29. 20 – Bironium longipes (Reitter): gonocoxite, scale = 0.1 mm. 21 – Bironium maculatum Löbl: gonocoxite, scale = 0.1 mm. 22–25, Bironium maindai sp. nov.: 22, 23 – Aedeagus in dorsal and lateral views, scale = 0.1 mm; 24 – Paramere in ventral view, scale = 0.1 mm; 25 – Internal sac, scale = 0.1 mm. 26–29, Bironium ornatum sp. nov.: 26, 27 – Aedeagus in dorsal and lateral views, scale 0.2 mm; 28 – Paramere in ventral view, scale = 0.2 mm; 29 – Internal sac, scale = 0.1 mm.