Intybia plonskii 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 : 117-119

Intybia plonskii Tshernyshev, 2016 sp. n.

( Figs 42–49 )

Type material examined. Holotype, male, Philippines: Luzon Island , Cagayan Valley , Isabella Province, 13°51′N 121°02′E, April 2014, coll.—? ; paratype, female, idem, Cordillera Administrative Region, Polis Mountain Range , 16°58′N 121°01′E, March 2014, coll.—?

Description. Holotype, male ( Fig. 42 ). Body elongate, parallel.

Head rufo-testaceous with dark brown basal part. Antennae pale yellow with 8th–11th segments brown to dark brown. Pronotum black with triangular rufous-brown triangular spot at base. Elytra black each with a white oval spot above the middle expanding over the external side and not reaching the suture, and a small white transverse line at the tip. Underside dark brown, with sides of abdominal sclerites lighter; legs dark brown except for lighter femora and tibiae in anterior and intermediate legs, all tarsi pale yellow. Surface of head, pronotum and elytrae evenly covered with short light goldish semi-erect pubescence, lacking long strong erect hairs. Vesicles yellow; thoracic mesepimera brown.

Head almost of the same width as the pronotum, strongly elongate, front flat, not sculptured; finely impressed, eyes small, round, distinctly protrudent, not stretched; genae impressed for convenient pacing of 1st antennal segment, short and oblique; clypeus extremely narrow, straight due to antennae settled strongly apical on head and very close each other; labrum short, transverse; palpi simple with apical segments enlarged, securiform, wide, truncate, and intermediate segments short and triangular; surface of head shining, punctures sparse and fine, microsculpture indistinct, with short, light, adpressed pubescence.

Antennae filiform with modified 1st–3rd segments, 1.5 mm long, reaching the basal quarter of elytra; 1st segment slightly enlarged and oblongo-clavate, 2nd segment rounded, very small, almost completely hidden by the 1st segment, 3rd segment swollen and flattened, slightly oval, complicatedly biimpressed, with bunch of hairs above at the middle of the segment ( Fig. 44 ), 4th segment small, rounded, remaining elongate, cylindrical, more or less equal in length, apical segment slightly longer than the previous and evenly narrowed at apex; surface sparsely covered with short, light semi-erect pubescence.

Pronotum longitudinal, convex in anterior half and depressed at base; anterior and posterior sides straight; lateral sides strongly narrowed at basal third; only basal side of the pronotum distinctly marginate; surface very sparsely and finely punctured at the base and lacking punctures in distal part, shiny, with dense fine semi-erect or adpressed pubescence.

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

Elytra parallel-sided, slightly convex posteriorly, at base distinctly wider than the pronotum; humeri indistinct, not protruding, suture emarginate, apices slender and simple, lacking appendages or processes, evenly rounded ( Fig. 40 ); surface of convex part very finely punctate, lacking microsculpture, shining, remaining part densely punctured, covered with dense goldish semi-erect hairs.

Hind wings normally developed.

Legs long, thin; posterior femora reaching elytral apices; all tibiae thin, straight, femora narrow, slightly compressed, not curved; all tarsi 5-segmented, narrow, slightly compressed and not elongate, 2nd segment in anterior tarsi simple, lacking comb, 1st–4th segments short, claw-segment longest in all legs and almost completely equal to 1st–3rd segments in all tarsi; claws thin, very short and narrow, sharp, with small membrane at base.

Ventral surface of body densely punctured, covered with light sparse, fine and adpressed pubescence; pygidium transversal, evenly narrowed and rounded to apex ( Fig. 45 ); ultimate abdominal ventrite narrow, transverse, evenly narrowed at apex, divided ( Fig. 46 ); aedeagus simple, straight, with wide and curved dorsally tip, endophallus with a central tube surrounded from sides with two rows of vertical short denticles settled from base to apical part ( Fig. 48 ); tegmen wide, with short and thin parameres which about 3 times shorter than the base ( Fig. 47 ).

Length 2.7 mm, width (at elytral base) 0.7 mm.

Female ( Fig. 43 ). Differs from male by simple filiform antenna with slightly modified 1st and 3rd antennomeres, the 3rd segment not oval, elongate, narrow, cylinrical, elytra more strongly widened and convex posteriorly. Hind wings normally developed, as in male. Length 2.7 mm, width (at elytral base) 0.7 mm.

Etymology. The species is named after my colleague from Austria, Isidor S. Plonski, who made several revision publications on Intybia Pascoe , and described new species from the Philippines.

Habitat. The species bionomy is unknown.

Distribution. The species was collected from two localities on Luzon Island, the Philippines ( Fig. 49 ).

Figures

FIGURES 42 – 49. Intybia plonskii Tshernyshev, 2016 sp. n., holotypus, male, dorsal view (42); paratypus, female, dorsal view (43); left antenna of male (44); male pygidium (45); male ultimate abdominal ventrite (46); tegmen (47); aedeagus, lateral (48); distribution map (49). Scale bar 0.5 mm.

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.