Tasactes baoxingensis Lü & Zhang, 2025

Lü, Heyu & Zhang, Runzhi, 2025, Four new species of the genus Tasactes Faust, 1894 (Coleoptera, Curculionidae, Dryophthorinae) from China, ZooKeys 1256, pp. 141-161 : 141-161

Tasactes baoxingensis Lü & Zhang sp. nov.

Figs 3 , 4 Chinese common name: 宝兴杯象 [băo xīng bēi xiàng ]

Material examined.

Holotype: ♂, labelled: printed: 四川 宝兴 锅巴岩 [ Sìchuān, Băoxīng, Guōbāyán ] / B 17 / Alt. 3080 m / 杯诱 [bēiyòu] / 2001. VII. 1–4 / 于晓东 [ Yú xiăodōng] 周红章 [ Zhōu hóngzhāng] leg. // printed: IOZ (E) 1965700 . Paratype: 1 ♀, same data as holotype, except a printed label: IOZ (E) 1965701 .

Type locality.

Guoba Rock, Baoxing County, Yaan City, Sichuan Province, China.

Comparative diagnosis.

Tasactes baoxingensis sp. nov. resembles T. dudkoi but differs in the following characters: (i) body smaller (length 4.20–4.40 mm vs 5.40–6.20 mm in T. dudkoi ); (ii) pronotum more distinctly constricted apically, lacking median carina (vs weak carina present in T. dudkoi ), and postocular lobes absent (vs weakly developed in T. dudkoi ); (iii) elytral pilose pustules distinctly wider than in T. dudkoi (see Legalov 2021: fig. 1); (iv) length ratio of pedon to temones exceeding that in T. dudkoi (see Legalov 2021: fig. 2).

Description.

( holotype, except female sternite 8 and genitalia).

Coloration (Fig. 3 A, B ). Body entirely black; antennal scape and funicle, and tarsomeres reddish brown.

Head (Fig. 3 C – E ). Forehead flat, slightly narrower than rostrum at base; eyes elongate-oval, distinctly separated ventrally; rostrum elongate ( Rl / Rw 3.80), longer than pronotum ( Rl / Pl 1.27), curved in lateral view, from base to apical 1 / 6 with short pubescence, apex with dense punctures; antennae inserted at apical 1 / 3 of rostrum; scape long (l / w5.18), not reaching eyes, gradually widening from base to apex, apical 1 / 3 markedly widened; funicular segments 1 and 2 elongate, segment 1 1.3 times as long as segment 2, segment 2 funnel-shaped, segments 4–6 transverse; club subconical (l / w2.00).

Pronotum (Fig. 3 F ). Wider than long ( Pl / Pw 0.97), widest at middle, apical 1 / 6 distinctly constricted, gradually narrowed from apical 1 / 4 to base; disc flat in lateral view, densely covered with coarse, deep punctures; distance between punctures much smaller than a puncture diameter; dense short pubescence present; postocular lobes absent.

Scutellum. Small, subtriangular.

Elytra. Longer than wide ( El / Ew 1.16), widest at middle, sides rounded; disc nearly flat in lateral view; interstriae slightly convex, subequal in width, with dense short pubescence, odd interstriae bearing interrupted oval pilose pustules, pustules hemispherical in lateral view, width 2.0 times interstriae width; striae deep, punctures large, with dense pubescence; distance between punctures subequal to a puncture diameter.

Abdomen (Fig. 3 G ). Abdominal ventrites densely covered with coarse punctures; ventrite 2 with anterior margin slightly convex at middle, posterior margins of ventrites 2–4 rectilinear; ventrite 2 0.9 times length of ventrite 1, ventrite 3 slightly longer than ventrite 4, ventrite 5 2.3 times as wide as long.

Legs. Densely covered with short pubescence; femora and tibiae with punctures; procoxae subconical, contiguous; profemur more robust than mesofemur and metafemur, femora unarmed; profemur 3.8 times as long as wide; tibiae bearing single long uncus; protibia 5.1 times as long as wide; tarsi long, tarsomeres 1–3 obconical, ventrally with setae, onychium elongate; claws free, divergent; protarsomere 1 1.7 times as long as wide, tarsomere 2 and 3 each 1.3 times, onychium 3.5 times.

Male genitalia (Fig. 3 H – K ). Pedon 0.3 times longer than temones, curved in lateral view, sides subparallel, base symmetrical, apex slightly narrowed; temones slender, slightly curved; manubrium of tegmen robust, elongate, slightly curved, approximately 3.0 times as wide as temones; spiculum gastrale robust, evenly curved; basal plate bifurcate, basal arms opposed, upper part of each basal arm approximately triangular, length subequal to width, apices with rounded angles.

Female sternite 8 and genitalia (Fig. 4 G – I ). Sternite 8 with apodeme length subequal to that of lamina; lamina bifurcate at middle, sides curved, apex with sparse setae; gonocoxites cylindrical, apices with dense setae; styli short, cylindrical, width approximately 1 / 3 width of gonocoxite apices, apices with short setae; spermatheca with curved, apically rounded cornu; corpus robust; ramus longer than collum.

Variation.

Male holotype. Measurements (in mm): Bl: 4.52. Rl: 1.90, Rw: 0.50. Pl: 1.50, Pw: 1.55. El: 2.90, Ew ( Bw): 2.50.

Female paratype. Measurements (in mm): Bl: 5.38. Rl: 2.00, Rw: 0.50. Pl: 1.80, Pw: 1.90. El: 2.61, Ew ( Bw): 2.70. Illustrations of a female are provided (Fig. 4 A – I ).

Female rostrum smooth and shiny from middle to apex, while male rostrum smooth only at apex; female antennae inserted at middle of rostrum, whereas male antennae inserted at apical 1 / 3.

Distribution.

Known only from the type locality in Sichuan Province, China (Fig. 9 ).

Etymology.

This species is named after its type locality, Baoxing County. Adjective, variable.

Figures

Figure 3. Tasactes baoxingensis sp. nov., holotype male. A. Dorsal habitus; B. Lateral habitus; C. Head, dorsal view; D. Head, lateral view; E. Eyes, ventral view; F. Pronotum, dorsal view; G. Ventrites, ventral view; H. Penis, lateral view; I. Penis, ventral view; J. Penis at apex, showing details of the pedon; K. Spiculum gastrale. Scale bars: 1 mm (A – D, F, G); 0.5 mm (H, I, K).

Figure 4. Tasactes baoxingensis sp. nov., paratype female (IOZ (E) 1965701). A. Dorsal habitus; B. Lateral habitus; C. Head, dorsal view; D. Head, lateral view; E. Pronotum, dorsal view; F. Ventrites, ventral view; G. Sternite 8; H. Ovipositor; I. Spermatheca. Scale bars: 1 mm (A – F); 0.25 mm (G – I).

Figure 9. Distribution of Tasactes species in China (based on specimens examined in this study).