Tychus grassator Sabella

Sabella, Giorgio, Besuchet, Claude & Kurbatov, Sergey A., 2011, New species of Tychini from Turkey and Japan (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 2764, pp. 22-34 : 29-30

Tychus grassator Sabella , sp. n.

( Figs. 6 , 18–19 )

Description. Body length 1.38–1.40 mm. Winged. Body uniformly reddish with yellowish antennae and legs, and yellow palpi.

Head as wide (0.26 mm) as long (0.26 mm), frontal rostrum 0.15 mm wide and 0.06 mm long. Dorsal vertexal foveae between and close to eyes with small tooth in front. Eyes with 10–12 ommatidia. Last segment of maxillary palpi 0.145 mm long and 0.06 mm wide.

Pronotum longer (0.325 mm) than wide (0.30 mm) with small and slightly impressed lateral antebasal foveae.

Elytra wider (0.54 mm) than long (0.41 mm) with humeri not very protruding. Discal fovea extended posteriorly in discal stria reaching half elytral length.

Abdomen with 1st tergite 0.175 mm long, basal impression extending more than 1/3 of tergite width.

Male. Antennae ( Fig. 6 ) 0.80 mm long, club 0.325 mm long; scapus distinctly longer than wide; segments 2 and 3 longer than wide; segment 3 longer and narrowed at base; 4 and 5 longer than wide and slightly wider than other segments of funicle; 5 longer than 4; 6 as long as wide, 7 longer than wide and slightly wider than 6; 8 distinctly wider than long and shorter than previous segments. Metaventrite with very slight median impression. Femora and tibiae of all legs slightly thickened, posterior margin of mesotrochanters extended into long and sharp median spine. Mesotibiae and metatibiae with small apical spur. All abdominal sternites not modified. Aedeagus ( Figs. 18–19 ) 0.375 mm long, dorsal apophysis of median lobe sinuate and canaliculate, with medial margin at middle prolonged into long spine-like process, curved and extended medially. Ventral portion of median lobe shorter than dorsal apophysis, in distal third curved laterally and with spine-like apex.

Female. Unknown.

Comparative notes. Tychus grassator is similar to T. coiffaiti but distinguished from the latter by smaller eyes (20–22 ommatidia in T. coiffaiti and 10–12 ommatidia in T. grassator n. sp.), antennomeres 4 and 5 distinctly longer than wide (slightly longer than wide in T. coiffaiti ) and different shape of the ventral portion and the dorsal apophysis of the median lobe of aedeagus.

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 18 – 19. Aedeagus of Tychus grassator sp. n., holotype, male from Kemalpasa (Izmir). 18 — Ventral view. 19 — Lateral view. Scale bar 0.1 mm.