Demotina sapensis, Romantsov & Moseyko, 2019

Romantsov, Pavel V. & Moseyko, Alexey G., 2019, New and little known species of Eumolpinae (Coleoptera: Chrysomelidae) from Northern Vietnam, Zootaxa 4609 (2), pp. 321-334 : 322-323

Demotina sapensis sp. nov.

( Figs 1–2 , 23–24 , 41–42 )

Holotype. “N Vietnam, Lao Cai Prov., near Sa / pa, Cat Cat Vill , 1220–1242 m.,/ N 22°19’37”, E 103°49’57.9” / N 22°19’29.7”, E 103°49’50” / 11.V.2018 P. Romantsov leg.”, 1♂ ( ZIN).

Paratypes. “N Vietnam, Lao Cai Prov., near Sa / pa, Cat Cat Vill , 1302–1320 m.,/ N 22°19’53”, E 103°49’21” / N 22°19’49.7”, E 103°49’8.9” / 17.V.2018 P. Romantsov leg.”, 1♂ 5♀ (PR); “N Vietnam, Lao Cai Prov., near Sa/ pa, Cat Cat Vill, 1280–1337 m.,/ N 22°19’35.3”, E 103°49’47.8” N 22°19’12.2”, E 103°49’17.9” / 21.V.2018 P. Romantsov leg.”, 1♀ (PR); “ Vietnam, mountains near Sa-Pa, 1600–2000/ 4. 0 6. 1963 Kabakov” (in Russian), 1♂ ( ZIN) ; same data but 23.05. 1963, 1♂ (PR); “ Vietnam, Lao Cai Prov./ near Sa Pa , 22°33’ N, 103°80’ E / 1370–1490 m., nr. Sin Chai Vill./ 29.04.2013 A. Prosvirov leg.”, 2 spms. not dissected ( ZIN) ;, “ Vietnam, Lao Cai Prov./ near Sa Pa, 22°33’ N, 103°82’ E / 1323 m., Cat Cat River / 23.04.2013 A. Prosvirov leg.”, 3 spms. not dissected ( ZIN) .

Description. Holotype, male. Blackish brown to reddish brown, covered with pale, whitish, and blackish scales, forming no pattern ( Fig. 1 ).

Head densely punctured and covered with scales, leaving feeble bald median line on frons. Labrum yellow; transverse, about 1.7 times as wide as long; anterior margin almost straight; lateral margins rounded; surface shiny with a few pale long setae in anterior part. Frontoclypeus brown, trapeziform with concave anterior margin, microsculptured in basal part, otherwise smooth, shiny with very sparse punctures and with short thin scales. Eyes of medium size, convex, not emarginate. Antennae dark brown, with basal three segments yellow; reaching posterior third of elytra, proportions of segments 11-6-11- 14-12-11-14 - 12-12-12-12 (scale: 1: 0.25 mm); segment 1 robust and slightly curved; segment 2 thickened, 2 times as long as wide; segments 3–6 almost cylindrical, about 6 times as long as wide; segments 7–10 slightly thickened apically, 3.5–4 times as long as wide; last segment lanceolate, 3 times as long as wide.

Pronotum 1.43 times as wide as long, widest in basal third, with unevenly rounded sides, forming narrow rounded angle in basal third. Surface with transverse depression in anterior part, densely and rather coarsely punctured, covered with scales, distributed evenly and directed outwards from one point in center of disc. Anterior and posterior margins unbordered. Lateral margin well marked only in basal half and indistinct, barely visible in apical half. Anterior and posterior angles acute, prominent, each of them with one long seta. Anterior margin of proepisterna (anterior margin of lateral arms of prosternum) straight; propleurae (pronotal hypomera) microsculptured and sparsely covered with scales. Intercoxal prosternal process slightly longer than wide, microsculptured, sparsely covered with setae and punctures in hind part.

Scutellum as wide as long, subpentagonal, narrowed posteriorly, with triangular apex. Surface covered with scales similar to those on elytra.

Elytra about 1.5 times as wide as pronotum, 1.35 times as long as wide, slightly narrowed behind humeri, then expanded in apical third and rounded at apex. Dorsum strongly convex, with very well-developed humeral calli and distinct basal impression. Surface strongly and irregularly punctured, covered with yellowish scales forming no pattern.

Legs robust, entirely dark brownish, fore and hind femora thickened. Fore and mid-femora with very small, hind femur with larger tooth. First segment of fore and mid- tarsi slightly widened. Claws bifid, claws segment of middle and fore legs 2.1–2.2 times, hind legs about 2.5 times longer than lobe of segment III.

Abdomen ventrally covered with scales smaller than those on dorsum. Lateral margin of 5th visible sternite with small denticles. Pygidium with punctures in apical half and microsculpured in basal half.

Aedeagus ( Figs 23–24 ) wide, more or less evenly narrowing towards wide, roundly truncated apex, length of aedeagus 1.4 mm.

Body length 4.8 mm, width 2.6 mm.

Paratypes: Body length 4.3–4.7 mm. in males, 4.7–5.2 mm in females. Body width 2.3–2.7 mm in males, 2.6–2.8 in females. Coloration of paratypes reddish brown, somewhat lighter than in holotype. First segment of fore and mid- tarsi narrow. Spermatheca somewhat C-shaped ( Fig. 41–42 ).

Etymology. The name of new species refers to the collecting locality.

Distribution. Northern Vietnam.

Differential diagnosis. The new species belongs to the group of Demotina with well-developed transverse anterior impression on the pronotum and thickened fore and hind femora. The most similar species is D. vietnamica Eroshkina, 1992 , from which the new species is distinguished by the larger size and longer pronotum. D. sapensis sp. nov. differs from the other species of this group in the pronotum widest in the basal third (vs. widest slightly behind middle in D. weisei Eroshkina, 1992 , D. medvedeviana Moseyko, 2006 , and D. rufonotata ( Pic, 1924)) and stronger puncturation of the pronotum. In addition, the aedeagus of D. weisei and D. medvedeviana are apically stretched tongue-like (vs. roundly truncated apex in D. sapensis sp. nov). The new species differs from D. rufonotata , which also has a roundly truncated apex of the aedeagus, in the inflection point of the apical part of the aedeagus in lateral view, which is located more apically than that of D. rufonotata , and in elytra without X-shaped blackish pattern. A key to the species of this group is given below.

Figures

FIGURES 1–6. Demotina spp., dorsal view. 1, Demotina sapensis sp. nov. (holotype, male); 2, D. sapensis sp. nov. (paratype, female); 3, D. medvedeviana (paratype, male); 4, D. vietnamica (holotype, male); 5, D. weisei (paratype, male); 6, D. rufonotata (syntype, male).

FIGURES 19–34. Colaspoides spp. and Demotina spp., abdomen (19, 20), aedeagus dorsal (21, 23, 25, 27, 29, 31, 33) and lateral (22, 24, 26, 28, 30, 32, 34) views. 19, C. pseudofemoralis sp. nov. (holotype, male); 20, C. femoralis (male); 21, 22, D. rufonotata (syntype); 23, 24, Demotina sapensis sp. nov. (holotype); 25, 26, D. medvedeviana (paratype); 27, 28, D. vietnamica (paratype); 29, 30, D. weisei (paratype); 31, 32, Colaspoides femoralis; 33, 34, C. pseudofemoralis sp. nov. (holotype).

FIGURES 35–45. Iphimoides suturalis, Colaspoides pseudofemoralis sp. nov. Demotina sapensis sp. nov. and Parascela filimonovi sp. nov., aedeagus dorsal (35–37, 39) and lateral (38, 40) views; spermatheca (41–45). 35–38, Iphimoides suturalis; 39, 40, Parascela filimonovi sp. nov. (holotype); 41, 42, D. sapensis sp. nov. (paratype); 43, Colaspoides pseudofemoralis sp. nov. (paratype); 44, Iphimoides suturalis; 45, Parascela filimonovi sp. nov. (paratype).