Tasactes dudkoi Legalov, 2021

Legalov, Andrei A., 2021, A new species of the genus Tasactes Faust, 1894 (Coleoptera, Curculionidae) from Nepal, Ecologica Montenegrina 40, pp. 128-132 : 129-132

Tasactes dudkoi Legalov , sp. nov.

https://zoobank.org/ urn:lsid:zoobank.org:act:884A9E45-5AD7-42DB-9928-60CD3E10A98C

( Figs. 1−2 )

Type material: Holotype, male ( ISEA), Nepal, Solukhumbu Distr. , Inkhu Khola River near Sibuje, 2000−2500 m, 27°34.7' N, 86°46.7' E, 27− 28.05.2018, R. Yu. Dudko ; Paratypes: 1 male ( ISEA) , 1 female ( ISEA), idem ; 1 male ( ISEA) , 1 female ( ISEA), Nepal, Solukhumbu Distr. , near Narkung Pass, 2700−3150 m, 27°35' N, 86°45' E, 28.05.2018, R .Yu. Dudko; 1 female ( ISEA), E Nepal, Bhojpur Distr. , 1.5 km NE of Salpa Pass, 3350 m, 27°26.7' N, 86°56.1' E, 21.05.2018, R .Yu. Dudko.

Description

Male. Body black, with matted pubescence. Antennae, apex of tibiae and tarsi red-brown. Head subconical. Mandibles small. Rostrum long, 1.1 times as long as pronotum, 3.7-4.0 times as long as wide at apex, 4.4 times as long as wide at midlength, 3.3-3.4 times as long as wide at base, evenly curved, sparsely punctate. Apex of rostrum smooth. Eyes large, not protruding from contour of head, linear, widely separated beneath. Forehead flat, 2.0 times as long as rostrum base width. Antennal scrobes directed ventrally to base of rostrum. Antennae inserted in apical third of rostrum. Scape long, 6.7 times as long as wide in apex, not reaching eye. Funicle 6-segmented. Antennomeres 2-7 subconical. Antennomere 2 1.8 times as long as wide in apex, 0.2 times as long as and 0.6 times as narrow as scape. Antennomere 3 2.0 times as long as wide in apex, equal in length and 0.9 times as narrow as antennomere 2. Antennomeres 4 and 5 subequal. Antennomere 4 0.8 times as long as wide in apex, 0.4 times as long as and 1.1 times as wide as antennomere 3. Antennomere 6 0.6 times as long as wide, equal in length and 1.3 times as wide as antennomere 5. Antennomere 7 0.8 times as long as wide, 1.5 times as long as and 1.2 times as wide as antennomere 6. Antennal club compact, 3.3 times as long as wide, 0.8 times as long as antennomeres 2-7 combined, with subconical tomentose apex. Pronotum campanulate, 1.4 times as long as wide at apex, 0.9 times as long as wide at midlength, 1.0-1.1 times as long at pronotal base. Pronotal disk weakly convex dorsally, densely punctate, with weak carina in middle. Intervals between points smaller than their diameter. Sides rounded, narrowed quite sharp towards base. Maximum width before middle. Base of pronotum 0.8-0.9 times as narrow as base of elytra. Scutellum small, triangular. Elytra suboval, at base 1.6 times as long as wide, at midlength 1.2 times as long as wide, at apical fourth 1.6-1.7 times as long as wide, 1.9-2.0 times as long as pronotum. Humeri weakly convex. Elytral striae distinct. Stria 9 short, fused with stria 10 at level of metacoxae. Interstriae convex, wide, wider than striae, pilose pustules. Prosternum punctate, with weak postocular lobes. Precoxal portion of prosternum distinctly longer than procoxal cavity. Postcoxal portion of prosternum short. Procoxal cavities contiguous. Mesocoxal cavities narrowly separated. Metanepisternum absent. Metaventrite quite long, longer than length of metacoxa, weakly convex, punctate. Abdomen weakly convex ventrally, punctate. Ventrite 2 1.1 times as long as ventrite 1. Ventrite 3 0.7 times as long as ventrite 2. Ventrite 4 0.6 times as long as ventrite 3. Ventrite 5 1.6 times as long as ventrite 4, coarsely punctate. Pygidium almost vertical, impressed in meddle. Procoxae subconical. Mesocoxae spherical, narrowly separated. Metacoxae transverse. Femora slightly thickened, without tooth. Metafemora 5.2 times as long as wide in middle, not extending beyond apex of abdomen. 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) 5.5-5.8 mm. Length of rostrum 1.6-1.9 mm.

Female. Rostrum subequal in length to pronotum, 3.8 times as long as wide at apex, 4.2 times as long as wide at midlength, 3.5 times as long as wide at base. Pronotum at apex 1.6 times as long as wide, subequal to wide in middle, at base 1.1 times as long as wide. Elytra at base 1.6 times as long as wide, at midlength 1.3 times as long as wide, at apical one fourth 1.7 times as long as wide, 1.9 times as long as pronotum. Total body length (without rostrum) 5.4-6.2 mm. Length of rostrum 1.8-1.9 mm.

Differential diagnosis. The new species is similar to Th. interruptus Faust, 1894 from Myanmar but differs from it in the more strongly curved rostrum, punctate pronotum, with rounded sides narrowed more sharply towards base.

Etymology. The species is named in honor of Dr. Roman Yu. Dudko (Novosibirsk, Russia).

Localisation. Eastern Nepal (Solukhumbu and Bhojpur Distr.).

Remarks. This species is leaf-litter-dwelling weevil in the mountain forests of Nepal ( Fig. 3).

Figures

Figure 1. Tasactes dudkoi sp. nov., body, dorsally: a - male, holotype, b - female, paratype. Scale bar = 1.0 mm.

Figure 2. Tasactes dudkoi sp. nov., holotype, aedeagus: a – dorsally, b – laterally, с – apex of aedeagus, dorsally. Scale bar = 1.0 mm.