Scaphobaeocera setosa Löbl, 2023

Löbl, Ivan & Cosandey, Vivien, 2023, Scaphobaeocera setosa sp. nov., an unusual Scaphidiinae (Coleoptera: Staphylinidae) with elongate tarsal setae from China, Acta Entomologica Musei Nationalis Pragae 63 (2), pp. 293-295 : 293-294

Scaphobaeocera setosa Löbl , sp. nov.

( Figs 1–5 )

Type locality. China, Yunnan, Xichuangbanna, 28 km NW Jinghong, vic. An Ma Xi Zhan, N22°12 E 100° 38, 700 m.

Type material. HOLOTYPE: J, CHINA: S. YUNNAN (Xichuangbanna) 28 km NW Jinghong, vic. An Ma Xi Zhan / N22°12 E 100°38 ( NNNR), 700 m, prim. forest, 18.VII.2008, leg. A.Weigel, MF (coll. Naturkundemuseum Erfurt, Germany).

Description. Lenth 1.98 mm, width 1.02 mm, dorsoventral diameter 1.10 mm. Head, pronotum and elytra dark brown with reddish shine. Exposed tergites blackish with light apices. Venter of thorax and ventrite I and II blackish; following ventrites lighter, apex of abdomen yellowish. Antennae yellowish. Legs rufous. Head with frons lacking microsculpture, very finely punctate, at narrowest point 0.22 mm, nearly as wide as half of head width with eyes. Length/width ratios of antennomeres as: III 20/8: IV 34/7: V 43/7: VI 40/8: VII 40/14: VIII 30/9: IX 40/16: X 45/17: XI 55/18. Antennomere IX to XI with conspicuously long setae. Pronotum and elytra with transversely strigulate microsculpture, iridescent; pronotum as frons very finely punctate. Scutellum completely concealed. Elytron with sutural stria deeply impressed, starting at each side of pronotal lobe, very finely punctate. Parasutural stria extremely fine, hardly visible at 100× magnification; discal punctation near base about as fine as that of pronotum, somewhat more distinct on prevailing surface. Hypomeron with longitudinally strigulate microsculpture, impunctate, lacking distinct line delimiting its upper part. Mesoventrite with low mesal ridge. Mesepimeron four times as long as wide, narrowing to tip, with obliquely strigulate microsculpture. Mesanepimeron impunctate, with obliquely strigulate microsculpture. Lateral parts of metaventrite sparsely, finely but distinctly punctate, with rather long setae and transversally strigulate microsculpture. Mesal part of metaventrite convex between mesocoxae, with most of mesal area flattened, conspicuously areaolate, lacking microsculpture and setiferous punctation, bearing long, erect setae only at lateral margins. Submesocoxal area nearly 0.03 mm long, submesocoxal line parallel, punctate. Metanepisternum flat, 0.06 mm wide, with straight suture and obliquely strigulate microsculpture. Tibiae straight. Abdomen with transversally strigulate microsculpture, punctation and pubescence sparse and fine, similar to that on lateral parts of metaventrite.

Male characters. Protarsomeres I to III strongly widened ( Figs 1, 2 ). Protarsomeres I and II bearing very long ventral setae. Protarsomere I conspicuously short, wider than long and nearly as wide as apex of protibia. Protarsomere II twice as long as protarsomere I, gradually widening apicad, at apex as wide as latter. Protarsomere III slightly shorter and narrowed than protarsomere II, the latter strongly widening apicad, with short ventral setae. Aedeagus ( Figs 3–5 ) 0.40 mm long, with strongly sclerotized process of median lobe.

Differential diagnosis. The key to identification of Chinese Scaphobaeocera species was published by LȎBL (1999, 2018a,b), this new species may be easily distinguished from all congeners by the shape of the protarsomeres I to III and the long ventral setae of the protarsomeres I and II. The large body size is also diagnostic. The body length of Scaphobaeocera ranges usually from about 1.0 to 1.6 mm, only a few of the described species are larger. Scaphobaeocera setosa sp. nov. is similar to S. pecki Löbl, 1981 from Japan and S. valida

Figures

Figs 1–2. Scaphobaeocera setosa Löbl, sp. nov. 1 – body in lateral view; 2 – protibia and protarsus. Scale bars: 0.5 mm (Fig. 1); 0.25 mm (Fig. 2).

Figs 3–5. Scaphobaeocera setosa Löbl, sp. nov. 3 – aedeagus in dorsal view; 4 – same in lateral view; 5 – paramere in ventral view. Scale bars: 0.1 mm (Figs 3–4); 0.05 mm (Fig. 5).