Macrotarrhus (Macrotarrhus) dudkoi, Legalov, 2023

Legalov, Andrei A., 2023, A new species of the genus Macrotarrhus Bedel, 1906 (Coleoptera, Curculionidae) from Uzbekistan, Baltic Journal of Coleopterology (Edinburgh, Scotland) 23 (1), pp. 65-68 : 67-68

Macrotarrhus (Macrotarrhus) dudkoi

Legalov, sp. nov.

( Fig. 1 )

Type material: Holotype. Male ( ISEA), Uzbekistan, Surxondaryo Region, S spur of Hisar Range, E of Tupalang Reservoir, 1000-1100 m, 38.633°N, 67.825°E, 26- 27.05.2023, R. Yu. Dudko.

Description. Male: Body black, covered with dense brown scales and setae. Antennae and tarsi black-brown. Rostrum quite short, slightly curved, with weak middle glabrous carina, densely punctate, 1.8 times as long as wide at apex, 1.9 times as long as wide in middle and at base, about 0.9 times as short as pronotum. Mandibles massive with one tooth on inner edge. Forehead flattened, densely punctate, about 0.4 times as long as rostrum base width. Eyes large, finely faceted, transversely oval, weakly convex. Temples very short. Antennae long, inserted at apex of rostrum. Scapus long, about 7.8 times as long as wide at apex, reaching eyes. Antennomeres 2 and 3 long-conical. Antennomere 2 3.0 times as long as wide at apex, 0.3 times as long as and about 0.8 times as narrow as antennomere 1. Antennomere 3 2.9 times as long as wide at apex, about 0.8 times as long as and about 0.9 times as narrow as antennomere 2. Antennomeres 4-6 conical. Antennomere 4 about 1.8 times as long as wide at apex, about 0.6 times as long as and about 0.9 times as narrow as antennomere 3. Antennomere 5 about 1.3 times as long as wide at apex, 0.8 times as long as and about 1.1 times as wide as antennomere 4. Antennomere 6 about 1.1 times as long as wide at apex, about 0.8 times as long as and equal in width to antennomere 5. Antennomeres 7 and 8 wide-conical. Antennomere 7 0.8 times as long as wide at apex, about 0.9 as long as and about 1.3 times as wide as antennomere 6. Antennomere 8 about 0.8 times as long as wide at apex, equal in length and about 1.1 times as wide as antennomere 7. Club compact, about 0.5 times as long as antennomeres 2-8 combined. Antennomere 9 about 0.8 times as long as wide at apex, 1.5 times as long as and about 1.4 times as wide as antennomere 8. Antennomere 10 slightly longer than width in middle, about 1.3 times as long as and slightly wider than antennomere 9. Antennomere 11 2.0 times as long as wide at base, 1.5 times as long as and about 0.8 times as narrow as antennomere 10. Pronotum companiform, about 1.2 times as long as wide at apex, about 0.8 times as long as wide in middle, equal in length and width at base. Greatest width before middle. Sides distinctly rounded. Scutellum small, trapezoidal. Elytra suboval, about 2.2 times as long as wide at base, about 1.5 times as long as wide in middle, about 2.1 times as long as wide at apex, 2.6 times as long as pronotum. Humeri smoothed. Greatest width in middle. Interstriae wide, 5.0-5.5 times as wide as striae width, flattened, densely punctate. Striae quite deep. Procoxal cavities rounded and contiguous. Pre- and postcoxal portions of prosternum short. Postcoxal portion of prosternum about 0.3 times as long as procoxal cavity and about 2.3 times as long as precoxal portion. Metaventrite short, about 0.5 times as long as length of metacoxal cavity. Metanepisterna very narrow, punctate. Abdomen weakly convex. Abdominal ventrites 1 and 2 fused, flattened in middle. Ventrite 1 about 0.7 times as long as metacoxal cavity. Ventrite 2 slightly longer than ventrite 1. Ventrite 3 about 0.9 times as long as ventrite 2. Ventrite 4 about 0.8 times as long as ventrite 3. Ventrite 5 about 1.4 times as long as ventrite 4. Pygidium hidden by elytra. Legs long. Femora widened. Tibiae weakly biconcave, with thickened dark thorns on inner edge, with apical comb of thickened black setae and small mucro. Tarsi long. Metatarsi longer than pro- and mesotarsi. Tarsomere 3 bilobed. Claws long and free. Tarsomere 5 elongated. Protarsi:

67 tarsomeres 1-3 flattened, with pulvilli on lower surface; tarsomeres 1 and 2 conical, quite wide, with dark thorns around edges; tarsomere 2 shorter than tarsomere 1; tarsomere 3 with dark thorns around edges. Mesotarsi: tarsomeres 1-3 with partially reduced pulvilli on lower surface and with dark thorns around edges; tarsomeres 1 and 2 conical; tarsomere 2 shorter than tarsomere 1. Metatarsi: tarsomeres 1-3 with almost reduced pulvilli on lower surface and dark thorns around edge; tarsomeres 1 and 2 long-conical. Total body length (without rostrum) 9.6 mm. Length of rostrum 2.2 mm.

Diagnosis. The new species is close to M. (M.) bartelsii ( Fig. 1 ) from West Kazakhstan but differs in the dense brown scales on the elytra, a weak middle carina on the rostrum, and wider aedeagus that is slightly narrower towards the apex. It is distinguish from M. (M.) conspersus ( Fig. 1 ) in the rostrum with middle carina, the elytra covered with brown scales, narrower second tarsomere of the protarsi and a wide aedeagus narrowed towards the apex.

Etymology. The species is named in honour of Roman Yu. Dudko (Novosibirsk), who collected this species.

Distribution. Uzbekistan: Hisar Range.

Figures

Fig. 1.Macrotarrhusspp.,male: a – M. dudkoi sp. nov., holotype, habitus, dorsally; b – M. dudkoi sp. nov., holotype, aedeagus, dorsally; c – M. bartelsii, aedeagus, dorsally, Kyzylorda Region; d – M. conspersus, aedeagus, dorsally, Almaty Region; e – M. dudkoi sp. nov., holotype, abdomen; f – M. dudkoi sp. nov., holotype, aedeagus, laterally; g – M. bartelsii, aedeagus, laterally, Kyzylorda Region; h – M. conspersus, aedeagus, dorsally, Namangan Region. Scale bar = 1.0 mm.