Tainochus bastardus Kurbatov

Sabella, Giorgio, Besuchet, Claude & Kurbatov, Sergey A., 2011, New species of Tychini from Turkey and Japan (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 2764, pp. 22-34 : 31-33

Tainochus bastardus Kurbatov , sp. n.

( Figs. 9 , 22–23 )

Type material. Holotype: JAPAN: Yamanashi Pref.: ɗ, Fuji-Yoshida, 900 m, 24.IX.1987 (C. Besuchet) ( MHNG).

Description. Body length 1.75 mm. Winged. Body color uniformly reddish with yellow legs and palpi. Densely covered by pubescence of flat golden bristles on head, pronotum, elytra and abdomen, particularly dense behind the temples, and of shorter and suberect yellowish bristles on maxillary palpi and legs.

Head sligthly wider (0.31 mm) than long (0.285 mm), widest at eye level and narrowest behind frontal rostrum (0.20 mm wide, 0.08 mm long), its surface densely punctate. Vertex very convex and separated from frontal rostrum by transverse depression with some punctures. Dorsal vertexal foveae between and close to eyes with small tooth in front. Eyes well developed with about 30 ommatidia. Occipital region convex, tempora rounded. Ventral process of head projecting posteriorly, nearly conical, relatively short and acute. Maxillary palpi large and elongate with last segment 0.16 mm long, 0.08 mm wide and with a pike-like apophysis on margin of apex. Antennae ( Fig. 9 ) short and robust, 0.75 mm long, club 0.28 mm long; scapus distinctly longer than wide; segment 2 as long as wide, 3 as long as wide and slightly narrowed at base; 4 slightly wider than long; 5 slightly wider than long and slightly wider than both 4 and 6; segments 6–8 wider than long. Antennal club consisting of last three segments broadening progressively from 9 to 11. Segment 9 transverse, distinctly wider than funicular segments; 10 transverse, wider than 9; segment 11 longer than wide, longer than combined length of 9 and 10.

Pronotum wider (0.385 mm) than long (0.35 mm), longer and wider than head, weakly convex on dorsal surface, widest near middle, more clearly tapered and rounded anteriorly than posteriorly, sparsely punctate on anterior part, coarsely and densely punctate on median and posterior part. Two faint lateral antebasal foveae and seven small basal pits, median larger than lateral. Metaventrite with very deep ovoid median impression reaching posterior margin of mesocoxal cavities, a median tubercle anteriorly of this impression.

Elytra wider (0.625 mm) than long (0.525 mm), distinctly longer than pronotum, with protruding humeri and weakly broadened posteriorly; slightly convex with sparse punctures. Three basal foveae on each elytron; sutural fovea associated with shallow sutural stria almost reaching elytral apex; discal fovea extended posteriorly in large and deep discal stria reaching half elytral length. Median fovea slightly prolonged posteriorly.

Abdomen with 1st tergite 0.21 mm long, longer than others and with basal impression extending more than 1/4 tergite width. 1st tergite with two basolateral foveae. 1st paratergite with two antebasal impressions. 2nd sternite with two antebasal foveae.

Legs with femora and tibiae of all legs slightly thickened, mesotibiae with small subapical spur, metatibiae with apical spur (these characters are likely to be male sexual characters, but only the discovery of a female, currently unknown, may confirm this hypothesis).

Aedeagus ( Figs. 22–23 ) 0.325 mm long, symmetrical with paired slender and setiferous parameres, phallobase with big basal foramen, ventral portion of median lobe robust, narrowed and truncated at apex; the apex with lateral margin prolonged into two spine-like processes. Subapically median lobe prolonged into two long and slender spine-like lateral apophyses.

Female. Unknown.

Comparative notes. Tainochus bastardus is similar to T. iwaoi Nomura, 1996 but distinguished from the latter by the ventral process of the head longer and stouter and different shape of the median lobe of aedeagus (cf. Figs. 22–23 and Figs. 24–25 ).

Figures

FIGURES 5 – 9. Antennae of Tychus and Tainochus. 5 — Tychus spurius sp. n., holotype, male from Bektas (Sinop). 6 — Tychus grassator sp. n., holotype, male from Kemalpasa (Izmir). 7 — Tychus altivagus sp. n., holotype, male from Saklikent (Antalya). 8 — Tychus latebrosus sp. n., paratype, female from Saklikent (Antalya). 9 — Tainochus bastardus sp. n., holotype, male from Fuji-Yoshida (Yamanashi). Scale bar 0.1 mm.

FIGURES 22 – 23. Aedeagus of Tainochus bastardus sp. n., holotype, male from Fuji-Yoshida (Yamanashi). 22 — Ventral view. 23 — Lateral view. Scale bar 0.1 mm.

FIGURES 24 – 25. Aedeagus of Tainochus iwaoi Nomura, 1996, specimen, male from Osaka (Gifu). 24 — Ventral view. 25 — Lateral view. Scale bar 0.1 mm.