Caccothryptus occidentalis, Hernando, Carles & Ribera, Ignacio, 2017

Hernando, Carles & Ribera, Ignacio, 2017, Three new species of the genus Caccothryptus Sharp, 1902 from Asia (Coleoptera: Limnichidae), Zootaxa 4243 (2), pp. 366-370 : 366-367

Caccothryptus occidentalis sp. n. ( Fig. 1 )

Type locality. Teen Pani , Uttarakhand, India.

Type material. Holotype male ( NMW): " IND: Uttaranchal // Teen Pani [r.], Deharadun Dist. // 30°04'20"N / 78°12'23"E // 9.XI.2006 // leg. M.A. Jäch (3)"; "left tributary of River Song // NE Doiwala // ca. 15 km ESE Dehradyn // ca. 365 m a.s.l. "; genitalia extracted and mounted on a transparent card, abdominal tergites mounted on a second transparent card; both cards pinned with the same specimen; plus red holotype label.

Description. Length 4.1, width 2.1 mm. Body dark brown, oval. Antennae and legs dark brown, except protibiae, which are black, and tarsi, paler.

Head: Eye margin weak, with a small denticle by insertion of antennae; with a very narrow supra-ocular sulcus. Eyes prominent. Puncturation on head uniformly fine and dense; space between punctures larger than their diameter. Pubescence long, erect, golden.

Pronotum: Transvere, slightly narrower than base of elytra, lateral margins regularly and slightly curved, very finely bordered. Puncturation denser than in head, very uniform; spaces between punctures wider than diameter. Two types of setae, one long, erect and castaneous; a second shorter, anteriorly recumbent, golden. The recumbent setae forming a weakly defined pattern.

Elytra: Base of elytra very convex. Disk with irregular and weakly impressed 3-4 rows of punctures. Elytral pubescence similar to that of pronotum, but anteriorly recumbent; with a zig-zag pattern, with varying colouration depending on illumination. Membranous wings well developed.

Venter: Fully pubescence except hypomeras, which are glabrous; prosternum strongly encased into the mesosternum. Prosternum finely punctured, margins bordered; mesosternum small, strongly punctured; metasternum with puncturation similar to mesosternum, dense and strong. Puncturation double, with smaller punctures irregularly distributed among the larger. Glandular pores in 4th abdominal sternite only.

Aedeagus ( Fig. 1 ): Slightly curved in lateral view. Apex of median lobe very wide in lateral view, with a strong angle in ventral side; apex emarginated in dorsal view, with a lateral angulosity. Apex of parameres rounded, internal margin of emargination sinuated, with a medial angulosity.

Comparative notes. Aedeagus in lateral view similar to C. jendeki Hernando & Ribera, 2014 and C. taiwanus Yoshitomi, 2015 . Apex of the parameres rounded as in C. sinensis Hernando & Ribera, 2014 (with a very different apex of the median lobe), C. orion Yoshitomi, 2015 (without denticle in lateral view) and C. taiwanus Yoshitomi, 2015 (with broader apex of parameres and shorter median lobe in lateral view, and different apex of the median lobe in dorsal view).

Etymology. Named in reference to their known distribution, at the occidental extreme of the range of the genus.

Distribution. So far only known from the type locality.

Figures

FIGURES 1 – 3. Male genitalia of: 1) Caccothryptus occidentalis sp. n., 2) Caccothryptus schillhammeri sp. n., 3) Caccothryptus thai sp. n. — aedeagus in A) lateral and B) ventral views; C) sternite XIX; D) sternite VIII. Scale bar: 0.5 mm.