Colasposoma (Colasposoma) unicostatum, Zoia, 2012

Zoia, Stefano, 2012, Eumolpinae (Coleoptera: Chrysomelidae) of Socotra Island, Insect biodiversity of the Socotra Archipelago (Acta Entomologica Musei Nationalis Pragae 52), pp. 449-501 : 462-463

Colasposoma (Colasposoma) unicostatum sp. nov.

( Figs. 35–36 , 117–118 , 143 )

Type locality. Yemen, Socotra Island, Al Haghier Mts., wadi Madar, 12°33.2′N, 54°00.4′E.

Type material. HOLOTYPE: ♀, ‘ Yemen, Socotra Island, Al Haghier Mts. , wadi Madar, 1180-1230 m, 12°33.2′N 54°00.4′E, P. Hlaváč leg. 12-14.xi.2010 [printed white label] ; Holotypus Colasposoma (Colasposoma) unicostatum n. sp. S. Zoia det. 2012 [printed red label]’ ( NMPC).

Description. Habitus as in Figs. 117–118 ; body length 9.3 mm.

Body black, prosternum, meso– and metaventrite with cupreous metallic hue; head, pronotum and elytra dark, with some metallic reflections: cupreous on head, sides of pronotum, scutellum and elytral base and sides, mainly metallic green on elytral disc; labrum dark, mandibles black, palpi yellowish; antennae reddish, antennomeres VII–XI somewhat darkened; legs reddish, knees somewhat darkened, tarsi black.

Frons with weak median impression, on whole surface with confused fine and close punctures, surface between punctures with very fine microreticulation; frons almost bare in middle, with fine pubescence on sides; clypeus not separated from frons, punctured, bare, anterior border concave. Two apical palpomeres reddish, oblong, penultimate a little shorter than last one, 1.5 times longer than wide. Antennomere I nearly twice as long and nearly twice as wide as II; antennomere II two times longer than wide; antennomere III twice as long as antennomere I and 3 times longer than wide; antennomeres IV–V subequal to III; antennomere VI shorter; antennomeres VII–X dull, weakly widened, VII longer than the following ones; antennomere XI nearly as long as X.

Pronotum 2.2 times wider than long (4.0 × 1.8 mm); sides arched and margined throughout, widest in basal third; angles poorly prominent, tooth-like, with bristle; surface with fine and confused punctation, punctures stronger and confluent into short striae on pronotal sides; pubescence very short and fine, hardly visible.

Scutellum wider than long, rounded, punctured.

Hypomeron with strong and spaced punctures, bare; distal border of prosternum almost straight on sides, concave in middle, margined; prosternum divided from hypomeron by deep suture; prosternum in midline nearly as long as wide between procoxae, feebly convex transversally, finely punctate-rugose, with very fine hyaline pubescence. Mesoventrite narrower than prosternum between coxae, its distal edge straight, surface finely punctured, finely rugose, pubescent; mesepimera not punctured, bare. Metaventrite finely punctured, with fine pubescence, distal border concave between coxae; metacoxae nearly as spaced as mesocoxae; metanepisterna nearly 3.5 times longer than wide, with very fine and close pubescence.

Elytra oblong, 1.4 times longer than wide at humeri (6.9 × 5 mm); smooth tubercle near basal edge separated from humeral callus and limited distally by semicircular impression; strong carina from humerus to apical slope, limited on both sides by oblong impressions ( Fig. 36 ); elytral apices in right angle; humeri moderately prominent, carinate, scarcely covering elytral sides in dorsal view; punctation fine, superficial and spaced on the elytral disc, stronger on elytral sides and apices; pubescence very fine and short, hardly visible. Epipleura wide, strongly angulated with elytral surface, subparallel proximally, gradually tapering along their distal half length, with very short and fine pubescence.

Legs long and slender; femora unarmed, feebly swollen; tibiae straight; tarsomeres slender. Claws appendiculate.

Dorsal side of abdomen scarcely sclerotized, with exception of pygidium which is subtriangular, with rounded apex, punctate and finely rugose in distal half, finely pubescent; abdominal ventrites finely punctured and pubescent;

Spermatheca as in Fig. 35 ; coxites short, subcylindrical, more sclerotized at base; spiculum ventrale long and thin; vagina without any sclerotization.

Male unknown.

Differential diagnosis. A species of Colasposoma (Colasposoma) of relatively large size, seemingly with no close relatives among known species; the habitus, somewhat resembling Galerucinae in appearance, with relatively small head and prothorax and finely punctate and large elytra, characterizes the species.Appearance of elytra somewhat reminds of Colasposoma (C.) zavattarii Pic, 1938 from Ethiopia, which clearly differs in any other aspect (a photo of the type of C. (C.) zavattarii is in ZOIA 2012).

Etymology. The name refers to the single longitudinal carina present on each elytron.

Figures

Figs. 35–43. 35–36 – Colasposoma (Colasposoma) unicostatum sp. nov. (♀ holotype): 35 – spermatheca; 36 – side of elytron. 37–43 – Colasposoma (Colasposoma) purcharti sp. nov. (37–39, 43:J holotype; 40–41:J, Qualentiah; 42:♀, wadi Ayhaft): 37 – aedeagus, apex, dorsal view; 38 – aedeagus, lateral view; 39 – aedeagus apex, lateral view; 40 – tegmen; 41 – ventral sclerite of sternite IX; 42 – spermatheca; 43 – protibia and tarsus.

Figs.117–128. Habitus, dorsal and lateral view of: 117–118 – Colasposoma (Colasposoma) unicostatum sp. nov. (J holotype); 119–120 – C. (C.) purcharti sp. nov. (J holotype); 121–122 – C. (C.) atrocyaneum sp. nov. (J holotype); 123–124 – C. (C.) brevepilosum sp. nov. (J holotype); 125–126 – C. (C.) brevepilosum orientale subsp. nov. (J holotype); 127–128 – C. (C.) brevepilosum maritimum subsp. nov. (J holotype).

Figs. 139–144. Distribution maps of the species based on the studied material (in Fig. 142, question marks indicate a possible montane form of C. (C.) brevepilosum sensu lato, see species description).