Orthosinus tuberculatus Legalov, 2021

Legalov, Andrei A., 2021, A new species of the genus Orthosinus Motschulsky, 1863 (Coleoptera, Curculionidae) from Laos, Ecologica Montenegrina 46, pp. 80-83 : 81-83

Orthosinus tuberculatus Legalov , sp. nov.

http://zoobank.org/ urn:lsid:zoobank.org:act:64D91618-C7EE-4E4D-AD08-1791402FE83F

( Figs. 1−2 )

Type material: Holotype, female ( ISEA), NE Laos, Hua Phan Prov., Phu Phan Mountains, 1200-1900 m, 18.V.-2.VI.2012, 20°12’N, 103°59’E, St. Jakl . Paratype: 1 female ( ISEA), idem, 1200-1600 m, 10- 22.V.2011, 20°12’N, 103°59’E, St. Jakl .

Description

Female. Body black, with matted yellowish pubescence. Scape, uncus and tarsi brownish. Head subconical. Mandibles small. Rostrum long, 0.9-1.0 times as long as pronotum, 3.8-4.0 times as long as wide at apex, 3.8-4.5 times as long as wide at midlength, 3.3-3.4 times as long as wide at base, evenly curved, densely punctate. Apex of rostrum almost smooth. Eyes large, not protruding from contour of head, linear, widely separated beneath. Forehead flat, 0.4-0.5 times as narrow as rostrum base width. Antennal scrobes directed ventrally to base of rostrum. Antennae inserted near middle of rostrum. Scape quite long, 4.0 times as long as wide in apex, not reaching eye. Funicle 6-segmented. Antennomere 2 suboval, 1.3 times as long as wide in apex, 0.2 times as long as and 0.6 times as narrow as scape. Antennomere 3 long-conical, 1.3 times as long as wide in apex, 0.8 times as long as and 0.9 times as narrow as antennomere 2. Antennomeres 3-5 subequal in width. Antennomeres 4-8 wide-conical. Antennomeres 4 and 5 subequal in length. Antennomere 4 about 0.6 times as long as wide in apex, about 0.5 times as long as antennomere 3. Antennomere 6 about 0.5 times as long as wide, 1.1 times as long as and about 1.4 times as wide as antennomere 5. Antennomere 7 0.5 times as long as wide, 1.2 times as long as and 1.1 times as wide as antennomere 6. Antennal club compact, obliquely truncate, 1.5 times as long as wide, 0.7 times as long as antennomeres 2-7 combined, with tomentose apex. Pronotum campanulate, 1.5-1.6 times as long as wide at apex, slightly narrower than wide at midlength, equal to width at pronotal base. Pronotal disk weakly convex dorsally, quite sparsely punctate, with weak carina in middle. Intervals between points wider than their diameter. Sides subparallel. Base of pronotum 0.8-0.9 times as narrow as base of elytra. Scutellum small, suboval. Elytra suboval, evenly rounded at apex with rounded sides, at base 1.6-1.7 times as long as wide, at midlength 1.3 times as long as wide, at apical fourth 2.5-3.2 times as long as wide, 1.8-2.0 times as long as pronotum. Humeri weakly convex. Elytral striae distinct, quite narrow. Stria 9 short, fused with stria 10 at level of metacoxae. Interstriae convex, wide, slightly wider than striae, with pilose pustules. Prosternum punctate, with weak postocular lobes. Precoxal portion of prosternum slightly shorter than procoxal cavity. Postcoxal portion of prosternum 0.6 times as long as precoxal portion. Procoxal cavities contiguous. Mesocoxal cavities narrowly separated. Metanepisternum absent. Metaventrite about 1.9 times as long as length of metacoxa, weakly convex, sparsely punctate. Abdomen weakly convex ventrally, punctate. Ventrite 1 about 1.9 times as long as length of metacoxa. Ventrite 2 about 0.9 times as long as ventrite 1. Ventrite 3 about 0.6 times as long as ventrite 2. Ventrite 4 about 0.7 times as long as ventrite 3. Ventrite 5 convex, 3.0 times as long as ventrite 4, coarsely punctate. Pygidium almost vertical. Procoxae subconical. Mesocoxae spherical, narrowly separated. Metacoxae transverse. Femora slightly thickened, without tooth. Tibiae weakly curved, with large uncus. Tarsi long. Tarsomeres 1-3 conical, with erect setae ventrally. Tarsomere 5 elongate. Tarsal claws free, divergent. Total body length (without rostrum) 5.1-5.8 mm. Length of rostrum 1.5-2.0 mm.

Differential diagnosis. The new species is similar to O. foveatus from Fujian ( China) but differs from it in the larger body sizes, the pronotum of equal length and width at base, wide elytral interstriae and narrow striae. It differs from other species of this genus in the wide elytra evenly rounded at the apex with rounded sides.

Etymology. From the Latin tubercula (tuberous).

Localisation. Laos, Hua Phan Prov.

Figures

Figure 1. Orthosinus tuberculatus sp. nov., female, body, dorsally. Scale bar = 1.0 mm.

Figure 2. Orthosinus tuberculatus sp. nov., female, body, laterally. Scale bar = 1.0 mm.