Carpelimus (Bucephalinus) nothus Gildenkov 2019, sp.n.

Carpelimus (Bucephalinus) nothus Gildenkov, sp.n.

Figs 15–17.

MATERIAL. Holotype, ♂ “ Philippines, Mindanao Mount Hamiguitan Range Wildlife Sanctuary, 6°73´N 126°14´E, about 500 m, 30.III.–2.IV.2018. A. Shavrin leg.” (DUISB). Paratypes: 2♂♂, 1♀, 2 ex. “Philippines, Mindanao Mount Hamiguitan Range Wildlife Sanctuary, 6°73´N 126°14´E, about 500 m, 30.III.–2.IV.2018. A. Shavrin leg.” (DUISB; 1♂ — cMG; 1 ex. — NHMW); 3 ex. “ PHILIPPINES: Mindanao Isl., Davao Oriental Prov., Mt. Hamiguitan Range Wildlife Sanctuary, Banakon Creek, narrow valley of small river. 6°´N 126°15´E, about 400 m a.s. l. 22– 24.03.2018. A. Shavrin ♂ 2” (DUISB); 1♂ “ PHILIPPINES: Mindanao Isl., Davao Oriental Prov., Sitio Bitaugan, Kawa-kawa Riever. 6°46´30.96´´N 126°08´41.10´´E. 300 m a.s.l. 24– 26.03.2018. A. Shavrin leg. ♂ 4” (cMG).

DESCRIPTION (holotype). Length 1.6 mm. Colouration brown, legs and antennae yellow brown, antennal segments 1–3 and 11 slightly lighter than others. Integument slightly shining, body with short, light-coloured hairs.

Head transverse, with a wide base, ratio of its length (from posterior margin of head to anterior margin of clypeus) to maximum width about 16:23. Neck constriction prominent. Eyes small, slightly convex. Temples well-developed, round, eye diameter in dorsal view much shorter than temple length. Head widest across temples (Fig. 15). Head surface with delicate, fine and dense punctation. Diameter of punctures about 4.0 times as small as eye facet. Distances between punctures about equal to their diameter, interspaces smooth, slightly shining. Antennae rather long, segments 1–3 elongate; segment 5 slightly elongate; segments 4 and 6–10 about as long as wide; segment 11 elongate, conical. Last 3 segments more massive than others and form loose club (Fig. 15).

Pronotum widest about 2/3 its length from base, then narrowed. Lateral margin smoothly rounded (Fig. 15). Ratio of pronotum length to its maximum width about 17:25. Surface of pronotum with delicate, fine and dense punctation; punctation similar to that on head. Punctures distinctly visible. Pronotal disc with 2 prominent depressions along midline: horseshoe-shaped depression near base and rectangular depression in middle part fused with depression at base such that medial ridge forms rounded protrusion (Fig. 15); disc apex with small, oval depression along midline (Fig. 15).

Ratio of length of elytra to their combined width about 26:30. Scutellum with shallow, round depressions (Fig. 1). Elytra with delicate, fine and dense punctation; punctures shallow. Diameter of punctures about twice as small as eye facet. Distances between punctures about equal to their diameter, interspaces smooth, slightly shining.

COMPARATIVE REMARKS. This species belongs to the “ silvestris ” species group [Gildenkov, 2014a, b, 2015] together with C. silvestris (Cameron, 1918), C. formosae (Cameron, 1940), C. kathmanduensis Herman, 2001, C. haraldi Gildenkov, 2014, C. postremus Gildenkov, 2014, C.snookus Gildenkov, 2014, and C. pseudosilvestris Gildenkov, 2014). It can be clearly distinguished (Figs 16–17) only by the structure of the aedeagus and differs from some of the aforementioned species in the structure of the spermatheca [Gildenkov, 2015, p. 377, Figs 11: 7–13; p. 378, Figs 12: 1–6]. It is most similar in body size and the structure of the aedeagus to a closely related and cohabiting species C. postremus. It can be distinguished by its significantly larger body size, darker colouration and the details of the structure of the aedeagus (Figs 16, 18). It is similar to C. pseudosilvestris in the shape of the depressions on the pronotal disc [Gildenkov, 2014 b, p. 237, fig. 2].

DISTRIBUTION. Philippines.

ETYMOLOGY. From Latin “nothus ” (spurious) referring to a close affinity to C. postremus.