Lyalinus bimaculatus, Borovec, 2018

Borovec, Roman, 2018, Lyalinus, a new genus of Cneorhinini from Burkina Faso (Coleoptera: Curculionidae), Acta Entomologica Musei Nationalis Pragae 58 (1), pp. 25-30: 29

publication ID 10.2478/aemnp-2018-0005

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scientific name

Lyalinus bimaculatus

sp. nov.

Lyalinus bimaculatus   sp. nov.

Type material. HOLOTYPE:, ‘ Ober Volta [ Burkina Faso], Bobo Diulassa [Bobo-Dioulasso], 9. [19]76, Politzar [lgt.]’ ( BMNH)   . PARATYPES: 17 spec., the same data as holotype (16 spec. BMNH, 1 ♀ RBSC).  

Description. Body length 3.89–5.25 mm, holotype 3.89 mm.

Appressed scales on elytra and pronotum separated by very narrow spaces, not completely hiding integument. Elytra with distinct small long oval spot from very dense scales behind base on intervals 7–9 and subtriangular small spot at apex of intervals 3–9. Pronotum with longitudinal wide stripes of a bit denser appressed scales surrounding median longitudinal glabrous space. Vertex densely squamose with very slender longitudinal glabrous stria.

Antennal scape weakly regularly curved along its whole length, weakly enlarged in apical quarter, at apex 0.6–0.7× as wide as club. Segment 1 1.8–1.9× as long as wide, 1.5× as long as segment 2 which is 1.5× as long as wide; segment 3 1.3–1.4× as wide as long; segment 4 isodiametric; segments 5–7 1.1× as wide as long; club 2.1–2.2× as long as wide.

Pronotum 1.33–1.41× as wide as long, widest at base, in apical half distinctly more tapered anteriad than in basal half. Disc shiny, regularly punctate, spaces between punctures shorter than diameter of one puncture.

Elytra 1.24–1.32× as long as wide, with regularly rounded sides. Striae distinctly punctate, space between punctures not deepened; intervals somewhat shiny, with very small, almost indistinct granules. Sutural interval on apical declivity slightly elevated.

Tarsi with segment 1 curved in basal half, 1.6–1.7× as long as wide; segment 2 conical, 1.1–1.2× as wide as long; segment 3 1.3–1.4× as wide as long and 1.4× as wide as segment 2; onychium 0.5–0.6× as long as segment 3.

Penis slightly wider at base, indistinctly tapered anteriad with straight sides, apex subtriangular with indistinctly concave sides and shortly obtuse tip; laterally almost straight, tip slender, elongate.

Spermatheca with ramus only indicated in corpus; nodulus in basal half parallel-sided, straight, in apical half curved backwards, regularly tapered apicad.

Etymology. The two subhumeral spots created by densely placed scales suggested the Latin name of this new species, the adjective bimaculatus (- a, - um).