Scaphoxium corporaali, Löbl, 2023

Löbl, Ivan, 2023, On the Scaphidiinae (Coleoptera: Staphylinidae) of Java, Indonesia, Acta Musei Moraviae, Scientiae biologicae 108 (1 - 2), pp. 1-34 : 28-29

Scaphoxium corporaali sp. nov.

( Figs 31 33 )

Type material. Holotype male, J. B. CORPORAAL JAVA­Preanger 6 Tjigembong 45 [numbers handwritten] / ZMA. INS. 5117722 ( NBCL).

Description. Length 1.48 mm, width 0.77 mm, dorsoventral diameter 0.80 mm. Head and body dark reddish­brown, apex of abdomen ochraceous. Antennae light brown. Length/width ratios of antennomeres as: III 20 /4: IV 20 /4: V 24 /5: VI 25 /6: VII 33 /9: VIII 24 /8: IX 32 /10: X 32 /12: XI 45 /12. Pronotum very finely punctate. Scutellum concealed. Elytron with sutural stria starting about 0.30 mm posterior of pronotal lobe, punctation nearly as fine as pronotal punctation, hardly visible at magnification 30 times. Hypomeron punctate, with short oblique stria, upper anterior part swollen. Mesoventrite shallowly impressed in middle, impunctate, lacking microsculpture and without mesal ridge. Mesoventral process flat, lacking carinae, notched. Metaventrite lacking microsculpture, with patch of conspicuous, coarse punctures in middle part of lateral areas, slightly convex in middle; submesocoxal lines convex, punctate; submesocoxal areas about 0.05 mm long, about as long as two thirds of shortest interval between them and apical metaventral margin. Metanepisternum flat, parallel­sided, with suture slightly shortened, impressed and punctate. Abdomen very finely punctate, ventrites with punctulate microsculpture.

Male. Protarsomeres I to III hardly widened. Aedeagus ( Figs 31 33 ) 0.62 mm long.

Etymology. The species is named after its collector, the Dutch entomologist Johannes Bastiaan Corporaal.

Differential diagnosis. Two of the five known Sundaland congeners, S. bilobum Löbl, 2015 and S. opacum Löbl, 2022 , share with S. corporaali the metaventral patches of coarse punctures. However, these species differ from S. corporaali notably by the aedeagal characters. The long filamentous proximal section of the internal sac of S. corporaali is shared with S. opertum Löbl, 2021 from Sabah, while the parameres and the sclerites of the internal sac are distinct.

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.