Anisandrus venustus, 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 venustus sp. nov. Fig. 24C, D, H

Type material.

Holotype, female, Taiwan: Taichung, Heping Dist., 2.iv.2014, C.-S. Lin (TARI). Paratypes, female, as holotype (MSUC, 2; NHMUK, 1; NMNH, 1); Yilan Co., Chilan cypress forest trail, 12.5K, EtOH+pinene, 22.xii.2018, Liu, Lan-Yu (LLYC, 2; RABC, 1).

Diagnosis.

3.1 mm long (mean = 3.1 mm; n = 4); 2.38 × as long as wide. This species is distinguished by the dense mesonotal mycangial tuft that extends laterally from the scutellum to striae 3; declivital posterolateral margin rounded; elytral disc with a broad, weak transverse saddle-like depression; declivital summit with a small denticle on interstriae 2 and a minute denticle on interstriae 1, interstriae 3 unarmed; declivital strial punctures large, seriate, each bearing a recumbent seta, interstriae flat, minutely punctate, punctures strongly confused, setose, setae hair-like, erect; declivity opalescent; elytral disc shiny and finely punctate; body abundantly covered with long erect hair-like setae; and pronotal asperities large, coarse, moderately spaced.

Similar species.

Anisandrus apicalis , A. auratipilus , A. hera , A. klapperichi , A. percristatus , A. xuannu .

Description

(female). 3.1 mm long (mean = 3.1 mm; n = 4); 2.38 × as long as wide. Body bicolored with pronotal and elytral bases lighter than rest of body. Pronotal and elytral bases brown, remainder of elytra and head dark brown. Legs and antennae light brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes, impunctate, median area with a broad diamond-shaped smooth, glabrous, strongly shiny area; lateral areas shagreened, weakly rugose, setose; each shallow ruga bearing a 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, shorter than length of club. Pedicel as wide as scape, shorter than funicle. Funicle 4-segmented, segment 1 shorter than pedicel. Club longer than wide, obliquely truncate, type 1; segment 1 corneous, encircling anterior face; segment 2 narrow, concave, corneous on anterior face only; sutures absent on posterior face. Pronotum: 0.64 × as long as wide. In dorsal view conical, type 0, sides convex, conical anteriorly; anterior margin with a row of 6-8 moderate serrations. In lateral view short and tall, type 3, disc as long as anterior slope, summit at midpoint. Anterior slope with moderately spaced, large, coarse asperities, becoming lower and more strongly transverse towards summit. Disc subshiny with dense, large, fine punctures bearing short to moderate, erect hair-like setae, some longer hair-like setae at margins. Lateral margins obliquely costate. Base transverse, posterior angles broadly rounded. Mycangial tuft present along basal margin tuft broad, densely setose, laterally extending to elytral striae 3. Elytra: 1.44 × as long as wide, 2.23 × as long as pronotum. Scutellum broad, large, linguiform, flush with elytra, flat, shiny. Elytral base transverse, edge oblique, humeral angles rounded, parallel-sided in basal 3/4, then narrowly rounded to apex; surface shiny. Disc shiny, with a broad, weak transverse saddle-like depression behind declivital summit, striae not impressed, with moderate, shallow punctures separated by 1-2 diameters of a puncture, setose, setae as long as a puncture, recumbent, hair-like; interstriae flat, minutely punctate, punctures strongly confused, setose, setae 1-1.5 × width of interstriae 2, erect hair-like, unarmed by granules. Declivity occupying approximately 1/3 of elytra, steeply rounded, declivital face flattened, opalescent; striae not impressed, strial punctures much larger and deeper than those of disc, and bearing setae 2 × as long as those of disc; interstriae densely minutely punctate, punctures strongly confuses, setose, setae 1-1.5 × width of interstriae 2, erect, hair-like, interstriae 2 as wide as interstriae 3 at midpoint of declivity, declivital summit with a small denticle on interstriae 2 and a minute denticle on interstriae 1, interstriae 3 unarmed. Posterolateral margin rounded, unarmed. Legs: procoxae contiguous; prosternal coxal piece short, inconspicuous. Protibiae obliquely triangular, broadest at apical 1/3; posterior face smooth; apical 1/2 of outer margin with six large socketed denticles, their length longer than basal width. Meso- and metatibiae flattened; outer margins evenly rounded with seven large, narrow socketed denticles.

Etymology.

L. venustus = like Venus, lovely, beautiful, elegant, graceful. An adjective.

Distribution.

Taiwan.

Host plants.

Unknown.

Figures

Figure 24. Dorsal, lateral and declivital view of Anisandrus ursulus, 4.3 - 4.9 mm (A, B, G), A. venustus holotype, 3.1 mm (C, D, H), and A. xuannu holotype, 4.0 - 4.15 mm (E, F, I).