Anisandrus auco, 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 auco sp. nov. Fig. 18E, F, K

Type material.

Holotype, female, Vietnam: Cao Bang, 22°36.3'N, 105°52.6'E, 1435-1601 m, 13-17.iv.2014, VN16, Cognato, Smith, Pham, ex FIT (MSUC).

Diagnosis.

2.9 mm long (n = 1); 2.23 × as long as wide. This species is distinguished by the mesonotal mycangial tuft the length of the scutellum; elytral disc flat; declivital interstriae clearly punctate; declivity gradual and convex, posterolateral margins rounded; pronotum rounded when viewed dorsally (type 1); and pronotum armed by four uniformly sized coarse serrations on anterior margin.

Similar species.

Anisandrus cryphaloides .

Description

(female). 2.9 mm long (n = 1); 2.23 × as long as wide. Body bicolored with pronotal and elytral bases lighter than rest of body. Pronotal and elytral bases, head, legs, and antennae light brown, remainder of elytra red-brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes, subshiny, punctate; punctures large, shallow, dense; punctures 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, as long as club. Pedicel as wide as scape, shorter than funicle. Funicle 4-segmented, segment 1 as long as 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: 0.85 × as long as wide. In dorsal view rounded, type 1, sides convex, rounded anteriorly; anterior margin with a row of four very large, coarse serrations. In lateral view short and tall, type 3, disc as long as anterior slope, summit at midpoint. Anterior slope with densely spaced, very large coarse asperities, becoming lower and more strongly transverse towards summit. Disc subshiny with moderately dense, large, shallow punctures bearing moderate, semi-recumbent, hair-like setae, some longer hair-like setae at margins. Lateral margins obliquely costate. Base transverse, posterior angles acutely rounded. Mycangial tuft present along basal margin, tuft moderately setose, approximately the width of scutellum. Elytra: 1.49 × as long as wide, 1.75 × 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 1/2, then broadly rounded to apex; surface shiny. Disc flat, striae not impressed, with moderately-sized, deep punctures separated by less than one diameter of a puncture, setose, setae as long as two punctures, recumbent, hair-like; interstriae flat, punctate, punctures strongly confused, setose, setae 1 × width of interstriae 2, erect, hair-like, unarmed by granules. Declivity occupying approximately 2/5 of elytra, gradually rounded, declivital face convex; striae weakly impressed, strial punctures larger and deeper than those of disc, punctures setose, setae slightly longer than the diameter of a puncture, semi-erect, hair-like; interstriae uniseriate punctate, setae 2 × width of interstriae 2, erect, hair-like, interstriae 2 as wide as interstriae 3 at midpoint of declivity. Posterolateral margin rounded, unarmed by granules. Legs: procoxae contiguous. 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 nine and ten small socketed denticles, respectively.

Etymology.

Vietnamese mythology, Âu Cơ - mountain fairy that gave birth to the ancestors of the Vietnamese people. Pronunciation - ò-ghá. Noun in apposition.

Distribution.

Vietnam.

Host plants.

Unknown.

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).