Intybia korshunovi Tshernyshev, 2016

Tshernyshev, Sergei E., 2016, Taxonomic revision of Intybia Pascoe, 1886 species (Coleoptera, Malachiidae) of Thailand and Philippines, Zootaxa 4147 (2), pp. 101-123 : 115-117

Intybia korshunovi Tshernyshev, 2016 sp. n.

( Figs 34–41 )

Material examined. Holotype, male, Thailand: Nakhon Ratchasima (Khorat) Province, Nong Bun Nak , alt. 200 m, deciduous gallery forest, 14°41′N 102°27′E, 1– 22.9.2011, leg. A.V. Korshunov ; paratypes, 12 females, ibidem.

Description. Holotype, male ( Fig. 34 ). Body elongate, parallel.

Head black with metallic green lustre and yellow base of labrum. Antennae dark brown with yellow dorsal sides of basal 1st–3rd segments. Pronotum orange with four small dark strokes in the middle. Elytra black with violet-green metallic lustre and with two yellow transversal stripes. Underside contrasting, prothorax and medial part of mesothorax, sides of abdominal sclerites and tips of coxae and trochanters yellow-orange, metathorax, trochanters and median areas of tergites black; legs dark brown except for yellow intermediate tibiae. Surface of head, pronotum and elytrae evenly covered with double goldish pubescence, sparse, fine and semi-erect and long strong erect hairs. Vesicles orange; thoracic mesepimera with yellow spot at base.

Head of the same width as the pronotum, front flat; finely impressed, eyes small, slightly protrudent, genae short and straight; clypeus narrow, transverse, straight; labrum short, transverse; palpi simple with obliquely truncate apical segment; surface of head shining, punctures sparse and fine, microsculpture indistinct, with short, light, adpressed pubescence and sparse erect long hairs.

Antennae filiform with modified 1st–3rd segments, 2.1 mm long, reaching the middle of elytra; 1st segment oblongo-clavate, 2nd segment rounded, very small, almost completely hidden by the 1st segment, 3rd segment swollen and flattened, complicatedly triply impressed, with bunch of hairs in apical side near 2nd segment ( Fig. 36 ), the remaining segments short cylindrical, more or less equal in length, apical segment slightly longer than the previous and evenly sinuate at apex; surface evenly covered with short, light semi-erect pubescence.

Pronotum longitudinal; with strongly archly protruding anterior side; posterior side straight; lateral sides strongly narrowed just behind the middle to the base, disc strongly impressed behind the middle before the basal side; only basal side of the pronotum distinctly marginate; surface very sparsely and finely punctured at the middle and densely and roughly punctate laterally, with smooth microsculpture, shiny, with dense fine semi-erect and sparse long erect pubescence.

Scutellum small, rectangular, densely punctured and covered with sparse pubescence, mat, distinct.

Elytra oblong, parallel-sided, at base distinctly wider than the pronotum at base; humeri distinct, slightly protruding, suture strongly marginate and carinate, apices slender and simple, lacking appendages or processes, evenly sinuate and rounded at the apices ( Figs 33 ); surface deeply and very densely punctate, with indistinct microsculpture, shining dark parts and mat light areas, covered with dense goldish semi-erect and spars erect hairs.

Hind wings normally developed.

Legs thin; anterior femora distinctly emarginate ventrally near tibiae, other femora just slightly emarginate at these places, posterior femora not reaching the elytral apices; tibiae thin, straight; femora slightly compressed; tibia rounded, all tarsi 5-segmented, narrow, anterior tarsi lacking combs; 5th segment longest, approximately equal in length to or somewhat longer of tarsomeres 3rd and 4th segments combined; the 1st segment is smallest in anterior and intermediate legs; claws with lamella at base, short, curved and sharp. Surface covered with short gold adpressed hairs.

Ventral surface of body densely punctured, covered with sparse, fine and depressed goldish pubescence; pygidium transversal, evenly sinuate to apex and with almost completely straight anterior side ( Fig. 37 ); ultimate abdominal ventrite narrow, transverse, evenly sinuate at apex and strongly emarginate at the middle, divided ( Fig. 38 ); aedeagus simple, straight, wide, with wide and slightly curved at the tip lamella, endophallus with two groups of small dents at the tip and at the base, three strong spines at base and two rows of four dents laterally ( Fig. 40 ); tegmen wide, with very short and thin parameres ( Fig. 39 ).

Length 3.1 mm, width (at elytral base) 0.9 mm.

Female ( Fig. 35 ). Differs from male by its simple filiform unmodified, shorter and slender antennae, elytra more strongly widened posteriorly. Length 3.1 mm, width (at elytral base) 0.9 mm.

Etymology. The species is named in honour of the famous Siberian naturalist, Aleksei Vladimirovich Korshunov, Kemerovo, Russia, whose collection of specimens of the new species was kindly presented for this study.

Habitat. The specimens of the new species were collected near to a small river in a deciduous gallery forest. Specific aspects of its bionomy are unknown.

Distribution. The species is known only from type locality, Nakhon Ratchasima Province in Thailand ( Fig. 41 ).

Figures

FIGURES 34 – 41. Intybia korshunovi Tshernyshev, 2016 sp. n., holotypus, male, dorsal view (34); paratypus, female, dorsal view (35); left antenna of male (36); male pygidium (37); male ultimate abdominal ventrite (38); tegmen (39); aedeagus, lateral (40); distribution map (41). Scale bar 0.5 mm.

FIGURES 27 – 33. Intybia baeri (Fairmaire, 1898), male, dorsal view (27); left antenna (28); pygidium (29); ultimate abdominal ventrite (30); tegmen (31); aedeagus, lateral (32); distribution map (33). Scale bar 0.5 mm.