Scaphobaeocera insinuata, Löbl, 2020

Löbl, Ivan, 2020, Four new Taiwanese species of Scaphobaeocera CSIKI (Coleoptera, Staphylinidae, Scaphidiinae), Linzer biologische Beiträge 52 (1), pp. 327-335 : 329-330

Scaphobaeocera insinuata nov.sp. ( Figs 5-7 )

Type material: Holotype ♂: TAIWAN Taitung Co. rd. 20 km 173 , 1200 m S. Vít, 13.iv.2009 Canacea litter 10 ( MHNG). Paratypes: 1♂, S. TAIWAN, Taitung Co. Rd no 20, km 174 , after Litao 8.iv.2007, S. Vít, env. 1300 m mountain forest litter ( MHNG) ; 2♂♂, TAIWAN, Hsinchu Co. Jienshih Twnsh . near Hsinkuang vill., km 44 rd no 60 , env. 1600 m S. Vít, 25.iii.2008 Canacea litter, ♂ iii6 ( MHNG) ; 1♂, Taiwan Fenchihu 1400 m, 12.vi.77 J. Klapperich ( MHNG) ; 2♂♂, TAIWAN Nantou Hsien, Shanlinchi 1650 m 16.V.1990 A. Smetana [T60] ( MHNG) ; 1♂. TAIWAN: Nantou County Huisun Forest reserve , track to Xiaochushan Mt. , 24.0744602N, 121.0366337E; 1150 m 4.v.2919; Damaška, Fikáček, Hu & Liu lgt. / primary forest on the slope with sparse understory: sifting of small accumulation of leaves / Huisun Leaf Litter Beetles Project ( NMNS).

Description: Length 1.15-1.25 mm, width 0.61-0.70 mm, dorsoventral diameter 0.63-0.73 mm. Head, pronotum, elytra and ventral side of thorax light reddish-brown to blackish-brown, elytra usually slightly lighter near apices. Abdomen about as thorax, with apical segments ochraceous. Appendages ochraceous. Length/width ratios of antennomeres as: III 18/7: IV 23/7: V 28/7: VI 23/8: VII 25/13: VIII 18/11: IX 23/15: X 25/17: XI 38/19. Pronotum very finely punctate, not microsculptured. Scutellum concealed or its tip exposed. Elytra not iridescent, with hardly visible parasutural striae, sutural striae deep, curved at base, discal punctation about as fine as pronotal punctation, microsculpture absent. Hypomera not microsculptured, smooth, lacking longitudinal stria. Middle area of metaventrite flat, entirely densely, distinctly punctate, with punctures to part about as large as puncture intervals; pubescence long; median stria and median impression absent. Lateral parts of metaventrite very finely and sparsely punctate, not microsculptured. Submesocoxal areas about 0.02-0.03 mm, submesocoxal lines appearing impunctate. Metanepisterna about 0.03-0.05 mm wide, flat, not narrowed posteriad, impunctate, with straight suture reaching metepimera. Tibiae straight. Ventrite 1 not microsculptured, very finely punctate, basal punctures distinct, slightly elongate. Following sternites with strigulate microsculpture.

Male characters: Protarsomeres 1 to 3 strongly widened, wide almost as apices of protibiae. Aedeagus ( Figs 5-7 ) 0.28-0.35 mm long. Median lobe with narrow basal bulb, apical process asymmetrical, moderately inflexed, long almost as basal bulb, ventral side irregularly concave, tip acute and bent in lateral view, blunt in dorsal view. Articular process not prominent. Parameres symmetrical, oblique, reaching posterior level of tip of median lobe, almost evenly broad in dorsal view, strongly widened apically in lateral view. Internal sac with narrow, convoluted flagellum forming two complete loops, widened and folded in proximal section.

Differential diagnosis: This species is very similar and likely related with S. furva . It differs in external characters from the latter by the wider antennomeres IX to XI and the setae on the median part of metaventrite distinctly longer. The aedeagi provide reliable distinguish characters, the apical process of the median lobe is notably longer, the parameres are more expanded apically, and the flagellum forming only two loops is distinctly folded in proximal section.

Etymology: The species epithet is a Latin adjective meaning not sinuate, referring to the proximal section of the flagellum.

Figures

Figs 1-7: Scaphobaeocera, aedeagi; (1, 2) S. furva nov.sp., in dorsal and lateral views, scale = 0.1 mm; (3, 4) Ditto, flagellum in dorsal and lateral views, scale = 0.05 mm; (5, 6) S. insinuata nov.sp., in dorsal and lateral views, scale = 0.1 mm; (7) Ditto, flagellum in lateral view, scale = 0.05 mm.