Scaphisoma ogawai, Löbl, 2018

Löbl, Ivan, 2018, A review of Scaphisomatini from Sulawesi, with descriptions of ten new species (Coleoptera: Staphylinidae: Scaphidiinae), Acta Entomologica Musei Nationalis Pragae 58 (1), pp. 151-165 : 155-156

Scaphisoma ogawai sp. nov.

( Figs 20–24 )

Type locality. Indonesia, Central Sulawesi, Palu District, Taman Nasional Lore Lindu [National Park], environs of Wuasa, 1°24,445 ′ S, 120°18,801 ′ E.

Type material. HOLOTYPE: ( NMPC), SULAWESI, Palu dist. / Lore Lindu N.P. , Wuasa env. , / 1°24,445’S, 20°18,801’E [sic!], / 15.viii. 2013, V.Hula lgt. PARATYPES: 2 ♀♀ ( NMPC, MHNG), with the same data as the holotype.

Description. Length 1.55–1.58 mm, width 1.05–1.07 mm. Body convex. Head and pronotum black, elytra slightly lighter than pronotum, blackish-brown, ventral side of thorax and abdomen dark brown, appendages ochreous. Antennae long, length/width ratios of antennomeres as: III 12/7: IV 36/8: V 44/8: VI 40/8: VII 48/11: VIII 38/10: IX 45/12: X 48/12: XI 53/13. Pronotum and elytra not microsculptured. Pronotum strongly narrowed anteriad, with regularly arcuate lateral margins, lateral margins carinae concealed near angles, distinct in middle section; punctation on disc very fine, dense, hardly visible at magnification 30×, consisting of sharply delimited punctures, puncture intervals much larger than puncture diameters, punctation along lateral carinae extremely fine. Tip of scutellum exposed. Elytra moderately narrowed apically, lateral margins almost regularly curved, lateral margin carinae exposed throughout in dorsal view, apical margin slightly rounded, inner apical angles situated posterior of level of outer angles, apical serration inconspicuous, sutural margin not raised, adsutural areas flat, narrow, each with single puncture row. Sutural striae parallel in basal halves, converging apically, curved near pronotal lobe and ending at basal margins, not extended laterad of pronotal lobe. Punctures along lateral margins very fine. Elytral disc with punctures fine, larger than those on pronotal disc, almost evenly large, sharply delimited, puncture intervals mostly about two to three times as large as puncture diameters, punctures near apical margins denser, to part about as large as puncture intervals. Hind wings fully developed. Exposed tergites with strigulate microsculpture, punctures about as large as those on elytra, less clearly delimited. Hypomera not microsculptured. Mesepimera two times as long as intervals between them and mesocoxae and four times as long as wide. Metaventrite with strigulate microsculpture, sparsely and extremely finely punctate, slightly impressed between metacoxae, with conspicuous mesal stria, antecoxal puncture rows absent, apical intercoxal margin slightly concave. Submesocoxal lines convex, distinctly punctate; submesocoxal areas 0.03 mm, about as long as fifth of shortest intervals between them and metacoxae. Metanepisterna flat, slightly narrowed anteriad. Tibiae straight. Abdomen with microsculpture and punctation as that on metaventrite. Abdominal ventrite I with submetacoxal line convex, distinctly punctate; submetacoxal areas each 0.05 mm, about as long as third of shortest intervals between them and apical margin of ventrite.

Male characters. Pro- and mesotarsomeres I to III moderately enlarged, narrower than apices of respective tibiae. Apical margin of abdominal ventrite VI narrow, subangular. Tergite IX with two macrosetae on each plate, stalk evenly narrow, oblique laterally ( Fig. 21 ). Aedeagus ( Figs 22–24 ) 0.75 mm long, symmetrical. Basal bulb large, narrowed apically, with pair of apicodorsal, inconspicuous plate-like areas. Apicoventral side of basal bulb oblique, articular process minute. Apical process strongly bent, almost vertical to axis of basal bulb, comparatively short, tapering in lateral view. Parameres with wide bases, gradually narrowed toward apical third, bent in apical halves, inner margins weekly sclerotized. Internal sac tubular, small sclerotized structures absent.

Female characters. Protarsi and mesotarsi narrow. Apical margins of elytra as in males. Gonocoxite slightly bent, evenly wide ( Fig. 20 ).

Differential diagnosis. The aedeagal characters suggest close relationships of S. ogawai sp. nov. and S. bugi . These species have a similar shape of the median lobe and parameres, and a simple, tubular internal sac lacking sclerotized pieces. The apicoventral side of the basal bulb is oblique in S. ogawai sp. nov. and differs drastically from that in S. bugi . The new species may be readily distinguished by its external characters, notably by the elytra lacking spots (spotted in S. bugi ), the antennomere IV three times as long as III (only two times as long as III in S. bugi ), the metaventrite striate in middle and with distinct strigulate microsculpture on lateral parts (in S. bugi lacking mesal stria and not microsculptured laterally), and the submesocoxal and submetacoxal lines distinctly punctate (appearing impunctate in S. bugi ).

Etymology. This species is dedicated to Ryo Ogawa, Matsuyama, Japan, who significantly contributed to the knowledge of the Sulawesi scaphidiines. The name is a noun in the genitive case.

Distribution. Indonesia, Central Sulawesi.

Figures

Figs 20–34. 20–24 – Scaphisoma ogawai sp. nov.: 20 – gonocoxite; 21 – male tergite 9; 22, 23 – aedeagus in dorsal and lateral views; 24 – paramere in ventral view. 25–27 – S. flavolineatum sp. nov.: 25 – male tergite 9; 26, 27 – aedeagus in dorsal and lateral views. 28–30 – S. pellax sp. nov.: 28, 29 – aedeagus in dorsal and lateral views; 30 – male tergite 9. 31–34 – S. sumpichi sp. nov.: 31, 32 – aedeagus in dorsal and lateral views; 33 – male tergite 9; 34 – gonocoxite. Scale bars: 0.1 mm (Figs 20, 28–29, 34); 0.2 mm (Figs 21–27, 30–32); 0.3 mm (Fig. 33).