Scaphobaeocera montisgedei, Löbl, 2023

Löbl, Ivan, 2023, On the Scaphidiinae (Coleoptera: Staphylinidae) of Java, Indonesia, Acta Musei Moraviae, Scientiae biologicae 108 (1 - 2), pp. 1-34 : 26

Scaphobaeocera montisgedei sp. nov.

( Figs 26, 27 )

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

Description. Length 1.50 mm, width 0.88 mm, dorsoventral diameter 0.91 mm. Body black, apex of abdomen dark brown, appendages light brown. Length/width ratios of antennomeres: III 14/10: IV 18 /8: V 25 /9: VI 15 /8: VII 57 /10: VIII 11 /8: IX 60 /13: X 58 /10 (antennomere XI missing on the sole antenna present). Pronotum not iridescent, lacking microsculpture, extremely finely punctate. Tip of scutellum exposed. Elytron with microsculpture, iridescent near suture, sutural stria deep, starting at side of pronotal lobe, parasutural stria distinct. Elytral punctation as fine and sparse as pronotal punctation. Ventral side of thorax lacking microsculpture. Hypomeron lacking stria, appearing impunctate. Mesoventrite with mesal ridge and longitudinal striae. Mesanepisternum extremely finely punctate. Metaventrite weakly convex in middle, with mesal stria extending from anterior margin to mid­length; distinct setigerous punctures on narrow area between mesocoxa and metacoxa and anterior metacoxal process, few scattered and extremely fine punctures on lateral areas; submesocoxal lines parallel, very finely punctate, submesocoxal areas about 0.02 mm long. Metanepisternum flat, 0.05 mm wide, not narrowing anteriad, with deep, straight suture. Protibiae and mesotibiae straight, metatibiae broken off, lacking. Ventrites lacking microsculpture. Ventrite I with punctation similar to that on sides of metaventrite; basal puncture row rather coarse, interrupted in middle, punctures becoming somewhat elongate laterad.

Male. [Tarsi broken off, lacking.] Aedeagus ( Figs 26, 27 ) 0.41 mm long.

Etymology. The species epithet is the Latinized name of Mount Gede.

Differential diagnosis. Only four species, S. escena Löbl, 2011 , S. junlei Löbl, 2018 , S. yunnana Löbl, 2018 and S. zdenae Löbl, 1992 , possess similar antennae, with the antennomeres III to VI and VIII very short, compared to the strongly elongate antennomeres VII and VIII to XI. Notable for these species is the antennal pubescence, with long, erect setae on the antennomeres VII and IX to XI ( Fig. 25 ). The new species is distinguished from the Philippine S. escensa and Chinese S. junlei by the aedeagus with its median lobe narrowing posteriad of the basal bulb and blunt at apex, the parameres weakly widening apicad, and the middle section of the flagellum strongly incurved. Scaphobaeocera yunnana shares with S. montisgedei an acute tip of the median lobe while its flagellum is only moderately curved. The genital characters of the Nepalese S. zdenae are unknown. However, the species may be easily distinguished from S. montisgenei by its metaventral microsculpture and the much larger metanepisterna.

Figures

Figs 21-27. Male genitalia and antenna. 21 – Scaphobaeocera basalis sp. nov., aedeagus in lateral view, scale = 0.1 mm. 22 – Ditto, internal sac, scale 0.1 mm. 23, 24 – Scaphobaeocera larga sp. nov., aedeagus in dorsal and lateral views, scale = 0.1 mm. 25 – Scaphobaeocera montisgedei sp. nov., antennomeres III to XI, scale = 0.1 mm. 26, 27 – Ditto, aedeagus in dorsal and lateral views, scale = 0.1 mm