Caccothryptus tibetanus, Yoshitomi, 2015

Yoshitomi, Hiroyuki, 2015, Four new species of the genus Caccothryptus (Coleoptera, Limnichidae), European Journal of Taxonomy 147, pp. 1-17 : 7-10

Caccothryptus tibetanus sp. nov.

urn:lsid:zoobank.org:act:3CE4012A-96D7-4568-9DB7-F2175F0B1278

Figs 1C , 3 A–D, 4E–F

Diagnosis

Medium size in the genus; TL = 4.65 mm in male, 4.40–4.70 mm in female; apical emargination of parameres deeply U-shaped.

Etymology

The species is named after the type locality.

Material examined

Holotype

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

Paratypes

TIBET: 3 ♀♀ ( EUMJ, NMW), same data as for the holotype.

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 slightly convex dorsally, densely covered with fine punctures. Antennae relatively long, reaching about proximal 1/5 of elytra. Pronotum punctate as in head; PW / PL 2.10. 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, densely and regularly punctate; space between punctures smaller than their diameter; adpressed silver setae forming zigzag markings; apex relatively pointed; humeral parts

distinctly projecting dorsally; EL / EW 1.40, EL / PL 3.65, EW / PW 1.24, TL / EW 1.79. Each claw on forelegs of same size and shape.

Sternite IX ( Fig. 3D ) elongate, with long and slender lateral projections.Aedeagus ( Fig. 3 A–C; basal part somewhat damaged) stout, curved ventrally in apical part, finely punctate in apical part of median lobe and parameres; median lobe slender in lateral view, pointed at apex; apical emargination of parameres deeply U-shaped; apices of parameres pointed in ventral and lateral views.

Female

Sexual dimorphism indistinct; PW / PL 1.98–2.08 (2.02), EL / EW 1.32–1.42 (1.37), EL / PL 3.40–3.76 (3.62), EW / PW 1.24–1.35 (1.31), TL / EW 1.68–1.80 (1.76). Ovipositor ( Fig. 4F ) well sclerotized; coxite closely punctuate, pointed at apices, about 1.03 times as long as spiculum ventrally ( Fig. 4E ); approximate ratio of coxite and baculus (n = 1) 1.0: 3.41.

Measurements

Male (n = 1): TL 4.65 mm, PW 2.10 mm, PL 1.00 mm, EL 3.65 mm, EW 2.60 mm.

Females (n = 3): TL 4.40–4.70 (4.59) mm, PW 1.95–2.08 (2.00) mm, PL 0.98–1.00 (0.99) mm, EL 3.40–3.70 (3.59) mm, EW 2.45–2.80 (2.62) 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. sinensis , but differs from it in having the median lobe straightly projecting posteriorly, and the emargination of parameres somewhat wider.

Figures

Fig. 1. Habitus of Caccothryptus spp., holotypes, ♂♂. A. Caccothryptus taiwanus sp. nov. B. C. orion sp. nov. C. C. tibetanus sp. nov. D. C. chayuensis sp. nov. Scales = 1.0 mm.

Fig. 3. Male genitalia of Caccothryptus spp. A–D. Caccothryptus tibetanus sp. nov. E–I. C. chayuensis sp. nov. — A–C, E–G. Aedeagus in ventral (A, E), dorsal (B, F) and lateral (C, G) views. H. Sternite VIII. D, I. Sternite IX.

Fig. 4. Female genitalia of Caccothryptus spp. A–B. Caccothryptus taiwanus sp. nov. C–D. C. orion sp. nov. E–F. C. tibetanus sp. nov. — A, C, E. Spiculum ventrale. B, D, F. Ovipositor.