Coptodryas inornata, Smith & Beaver & Cognato, 2020

Smith, Sarah M., Beaver, Roger A. & Cognato, Anthony I., 2020, A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China, ZooKeys 983, pp. 1-442 : 1

Coptodryas inornata sp. nov. Fig. 36E, F, K

Type material.

Holotype, female, Vietnam: Dong Nai, Cat Tien N.P., 11.42854, 107.42544, 148 m, 23.ii.2017, VN98, A.I. Cognato, T.A. Hoang, ex 5 cm diameter branches (MSUC). Paratypes, female, as holotype (MSUC, 5; NHMUK, 5; NHMW, 5; NMNH, 5; VMNH, 5).

Diagnosis.

3.1-3.2 mm long (mean = 3.14 mm; n = 5); 2.38-2.46 × as long as wide. This species is distinguished by the lack of a tuft of setae along the elytral base; declivity rounded; elytra shiny; striae and interstriae distinct; interstrial punctures confused; body lightly setose; antennal club as broad as tall; protibiae distinctly triangular; pronotum basic (type 0) when viewed laterally, basic (type 2) when viewed dorsally; and anterior margin of the pronotum without a row of serrations.

This species strongly resembles Xylosandrus formosae which also lacks a distinct mycangial tuft (at the base of the pronotum) and both have triangular protibia. Coptodryas inornata is distinguished by the reduced scutellum, antennal club type 3 (as described for genus), and elytral base bisinuate and costate.

Similar species.

Microperus fulvulus , Xylosandrus formosae .

Description

(female). 3.1-3.2 mm long (mean = 3.14 mm; n = 5); 2.38-2.46 × as long as wide. Pronotum, head, antennae, and legs light brown, elytra darker brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes, alutaceous, subshiny, punctate, punctures large, shallow, setose; punctures bearing a long, erect hair-like seta. Eyes shallowly emarginate just above antennal insertion, upper part smaller than lower part. Submentum distinctly triangular, flat, flush with genae. Antennal scape regularly thick, as long as club. Pedicel as wide as scape, shorter than funicle. Funicle 4-segmented, segment 1 shorter than pedicel. Club longer than wide, flattened, type 4; segment 1 corneous, small, convex; segment 2 larger than segment 1, narrow, transverse, corneous; segments 1-3 present on posterior face. Pronotum: 0.72 × as long as wide. In dorsal view basic and parallel-sided, type 2, sides parallel in basal 2/3, rounded anteriorly; anterior margin without serrations. In lateral view basic, type 0, disc flat, summit at midpoint. Anterior slope with densely spaced, broad asperities, becoming lower and more strongly transverse towards summit. Disc shiny with dense minute punctures, densely setose, setae short erect hair-like, some longer hair-like setae at margins. Lateral margins obliquely costate. Base weakly bisinuate, posterior angles acutely rounded, almost subquadrate. Elytra: 1.4 × as long as wide, 1.96 × as long as pronotum. Scutellum minute, convex, slightly raised above elytral surface. Elytral mycangium setal tuft of absent. Elytral base bisinuate, edge oblique, humeral angles rounded, parallel-sided in basal 2/3, then rounded to apex. Disc flat, shiny, striae not impressed, with small shallow punctures separated by 2-3 diameters of a puncture, setose, setae short, recumbent, hair-like; interstriae flat, minutely and confusedly punctate, setose, setae 2 × as long as strial setae, erect, hair-like. Declivity occupying approximately 2/5 of elytral length, rounded, face convex, strongly shiny; striae flat, setose, setae as described for disc, punctate, punctures similar in size to those of disc; interstriae 1-3 parallel, interstriae densely covered with long, erect hair-like setae; interstriae impunctate, densely and uniformly uniseriately granulate from base to apex, setose, setae as described for disc. Posterolateral margin distinctly carinate to interstriae 7. Legs: procoxae contiguous; prosternal coxal piece short, inconspicuous. Protibiae distinctly triangular, broadest at apical 1/4; posterior face smooth; apical 1/2 of outer margin with six or seven large socketed denticles, their length longer than basal width. Meso- and metatibiae flattened; outer margins evenly rounded with 9-11 and eight large socketed denticles, respectively.

Etymology.

L. inornatus = unadorned. In reference to the atypical unsculptured declivity. An adjective.

Distribution.

Vietnam.

Host plants.

Unknown.

Figures

Figure 36. Dorsal, lateral and declivital view of Coptodryas confusa, 1.8 - 2.2 mm (A, B, I), C. elegans syntype, 2.1 - 2.4 mm (C, D, J), C. inornata holotype, 3.1 - 3.2 mm (E, F, K), and C. mus, 2.3 - 2.4 mm (G, H, L).