Caccothryptus chayuensis sp. nov.

urn:lsid:zoobank.org:act: 43136CDF-3F5C-4AD4-A7DC-3F57299013EC

Figs 1D, 3 E–I

Diagnosis

Larger species in the genus; TL = 5.90 mm in male; median lobe minutely serrate in ventral part; apical emargination of parameres V-shaped.

Etymology

The species is named after the type locality.

Material examined

Holotype

TIBET: ♂ (EUMJ), “ Cha Yu, 1824m S.E. Tibet 9-IX-1996 C. I. Li leg.”.

Description

Male

Body oblong, convex strongly in dorsal and slightly in ventral parts, shiny, densely covered with short silver setae. Coloration of body dark brown, but femora and tarsi paler.

Head convex dorsally, densely covered with fine punctures. Antennae relatively long, reaching about proximal 1/5 of elytra. Pronotum punctate as in head; PW / PL 2.04. Scutellar shield equilateral triangular, finely punctate, lateral margins straight. Elytra oblong, subparallel-sided near base to apical 1/4, gently tapering in apical 1/4, relatively pointed at apex, sparsely and irregularly punctate; space between punctures larger than their diameter; adpressed silver setae forming zigzag markings; humeral parts distinctly convex dorsally; EL / EW 1.50, EL / PL 4.17, EW / PW 1.36, TL / EW 1.86. Each claw on foreleg of same size and shape.

Sternite VIII (Fig. 3H) U-shaped, bearing short setae in apical parts. Sternite IX (Fig. 3I) elongate, with long and slender lateral projections. Aedeagus (Fig. 3 E–G) slender, slightly curved ventrally, finely punctate in apical part of median lobe and parameres; median lobe wide in lateral view, rather pointed at apex, minutely serrate in ventral part; apical emargination of parameres V-shaped; apices of parameres pointed in ventral view, forming thumb-like projection in lateral view.

Female

Unknown.

Measurements

Male (n = 1): TL 5.9 mm, PW 2.35 mm, PL 1.15 mm, EL 4.80 mm, EW 3.20 mm.

Distribution

Only known from the type locality, Tibet.

Remarks

This species belongs to the testudo species group (sensu Hernando & Ribera 2014). It is related to C. fujianensis Hernando & Ribera, 2014 known from China (Fujian), C. malickyi Hernando & Ribera, 2014 from Vietnam and C. jendeki Hernando & Ribera, 2014 from India, but differs from them in the following characteristics: median lobe with minute serrae in the ventral part, pointed at apex; emargination of parameres rather shallow.