Bironium riedeli, 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 : 243-244

Bironium riedeli sp. nov.

( Figs 37 -41)

Type material. Holotype ♂, Irian Jaya Prov. Jayawijaya, Borme 1500- 2000 m, 12- 15.8.1992, Riedel [24] ( MHNG) . Paratypes 2 ♂, 1 ♀, with the same data as the holotype ( MHNG).

Description. Length 1.92- 1.98 mm, width 1.17 mm. Head and body uniformly ochraceous, appendages slightly lighter. Pronotum very finely punctate. Scutellum triangulate. Elytra lacking humeral humps; adsutural areas not or slightly raised; sutural striae with few fine punctures or impunctate, lateral striae impunctate; basal striae widely interrupted at level of humeral areas; discal punctation irregular, to part similar to pronotal punctation, very shallow and hardly visible at 100 times magnification. Mesoventrite convex, with well delimited mesal ridge extended from paxillum nearly to apical margin, impunctate, lacking microsculpture, with hardly visible longitudinal striae on mesocoxal process. Metaventrite not microsculptured, entirely very finely punctate. Median part of metaventrite flattened, with anterior margin below level of margin of mesoventrite, with hardly visible longitudinal striae; apical stripe flat, not impressed; metacoxal process inflexed, with margin notched near coxae. Submesocoxal lines with few coarse punctures. Metanepisterna narrow, about 0.04- 0.05 mm wide. Metanepisternal suture impunctate, mostly straight, curved apically, reaching near to margin of metepimeron. Ventrite Iwithout basomedian hump, not microsculptured, coarsely punctate along basal margin. Following ventrites with punctulate microsculpture. Protarsomeres lacking prominent ventral lobe.

♂: Protarsomeres Ito III hardly widened, protarsomere Islightly wider than half of protibial apex, following two tarsomeres still somewhat narrower. Protarsomere I somewhat longer than following two tarsomeres combined. Apicoventral pair of long setae of protarsomere III not flattened apically. Aedeagus as Figs 37 -40, 0.64- 0.67 mm long.

♀: Gonocoxite as Fig. 41 , without gonostyle.

Distribution. Indonesia: Papua .

Etymology. The species is dedicated to Alexander Riedel (Karlsruhe, Germany) who significantly contributed to the knowledge of New Guinean beetles and collected most of the scaphidiines dealt in the present paper.

Comments. This species may be distinguished by the shape of the parameres of the sclerotized structures of the internal sac. In external characters it is similar to B. basicolle , B. loksai and B. glabrum (see the key).

Figures

Figs 30-38. 30 – Bironium ornatum sp. nov.: gonocoxite, scale = 0.05 mm. 31–36, Bironium punctatum sp. nov.: 31, 32 – Aedeagus in dorsal and lateral views, scale = 0.2 mm; 33 – Tip of median lobe, scale = 0.05 mm; 34 – Internal sac, scale = 0.05 mm; 35 – Paramere in ventral view, scale = 0.1 mm; 36 – Gonocoxite, scale = 0.05 mm. 37–38, Bironium riedeli sp. nov.: Aedeagus in dorsal and lateral views, scale = 0.1 mm.

Figs 39-49. 39–41, Bironium riedeli sp. nov.: 39 – Paramere, ventral view, scale = 0.1 mm; 40 – Internal sac, scale = 0.1 mm; 41 – Gonocoxite, scale = 0.05 mm. 42–45, Bironium rufulum sp. nov.: 42, 43 – Aedeagus in dorsal and lateral views, scale = 0.2 mm; 44 – Paramere in ventral view, scale = 0.1 mm; 45 – Gonocoxite, scale = 0.05 mm. 46–49, Bironium striatum sp. nov.: 46, 47 – Aedeagus in dorsal and lateral views, scale = 0.2 mm; 48 – Paramere in ventral view, scale = 0.1 mm; 49 – Gonocoxite, scale = 0.05 mm.