Anisandrus achaete, 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

Anisandrus achaete sp. nov. Fig. 18A, B, I

Type material.

Holotype, female, 云南 勐养 700m 寄主:栎 1984.VII.19 [China: Yunnan, Mengyang, 700 m, 19.vii.1984, ex Fagaceae ] (NMNH). Paratype, female, as holotype (IZAS).

Diagnosis.

3.5 mm long (mean = 3.5 mm; n = 2); 2.33 × as long as wide. This species is distinguished by the mesonotal mycangial tuft absent; antennal club type 2, one suture on posterior face; elytral disc with a weak transverse saddle-like depression near declivital summit; declivity unarmed by spines; declivital striae strongly impressed, interstriae granulate; and anterior margin of pronotum without serrations.

Similar species.

Anisandrus apicalis .

Description

(female). 3.5 mm long (mean = 3.5 mm; n = 2); 2.33 × as long as wide. Body bicolored with pronotal and elytral bases light brown, remainder of elytra red-brown. Head, legs, and antennae light brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes, strongly shiny, finely punctate; lateral areas weakly rugose, setose; each shallow ruga or puncture bearing a very long, erect hair-like seta. Eyes shallowly emarginate just above antennal insertion, upper part smaller than lower part. Submentum large, distinctly triangular, slightly impressed. 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 wider than long, obliquely truncate, type 2; segment 1 corneous, transverse on anterior face, occupying basal 2/5, nearly covering posterior face; segment 2 narrow, corneous; segment 1 present on posterior face. Pronotum: 0.89 × as long as wide. In dorsal view basic, type 2, sides parallel in basal 1/2, rounded anteriorly; anterior margin without serrations. In lateral view basic, type 0, disc as long as anterior slope, summit at apical 2/5. Anterior slope with densely spaced, large fine asperities, becoming lower and more strongly transverse towards summit. Disc impressed behind summit, shiny, impunctate, glabrous, some long hair-like setae at margins. Lateral margins obliquely costate. Base transverse, posterior angles acutely rounded. Mycangial tuft absent. Elytra: 1.55 × as long as wide, 1.75 × as long as pronotum. Scutellum narrow, moderately sized, linguiform, flush with elytra, flat, shiny. Elytral base transverse, edge oblique, humeral angles rounded, parallel-sided in basal 2/3, then broadly rounded to apex; surface shiny. Disc with a weak medial transverse saddle-like depression, striae 1-3 distinctly impressed, other striae not impressed, punctures small, deep, separated by 2-4 diameters of a puncture, glabrous; interstriae glabrous, unarmed, interstriae 1-4 feebly convex, punctate, punctures minute, confused. Declivity occupying approximately 1/3 of elytra, steeply rounded, declivital face flattened; striae deeply impressed, strial punctures much larger and deeper than those of disc; interstriae impunctate, uniseriate granulate, granules bearing setae 1.5 × width of interstriae 2, erect, hair-like, interstriae 3 narrower than interstriae 2 at midpoint of declivity. Posterolateral margin rounded, unarmed by granules. Legs: procoxae contiguous, prosternal coxal piece tall and pointed. Protibiae distinctly triangular, broadest at apical 4/5, posterior face smooth; apical 1/2 of outer margin with eight moderate socketed denticles, their length slightly longer than basal width. Mesotibiae flattened, distinctly triangular, apical 1/2 with nine moderate socketed denticles on outer margin; metatibiae flattened, obliquely triangular, apical 1/2 with nine moderate socketed denticles on outer margin.

Etymology.

G. a = without; chaite = long hair. In reference to the uncharacteristically reduced number of elytral setae. Noun in apposition.

Distribution.

China (Yunnan).

Host plants.

Recorded from Fagaceae .

Remarks.

Locality labels on the holotype and paratype are in Chinese and were translated by You Li. An English locality label has been placed on each specimen below the original locality labels.

Figures

Figure 18. Dorsal, lateral and declivital view of Anisandrus achaete holotype, 3.5 mm (A, B, I), A. apicalis, 3.05 - 3.4 mm (C, D, J), A. auco holotype, 2.9 mm (E, F, K), and A. auratipilus holotype, 2.8 mm (G, H, L).