Anisandrus congruens, 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 congruens sp. nov. Fig. 19C, D, J

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). Paratypes, female, Thailand: Chiang Mai, Doi Pui, 1400 m, 20-24.xii.2004, W. Puranasakul, ex EtOH trap (RABC, 1); Vietnam: Lao Cai, Hoang Lien N.P., 22.35, 103.77, 1500-2000 m, 19.v.2019, VN169, S.M. Smith, A.I. Cognato (MSUC, 1); as previous except: 18-19.v.2019, ex FIT (MSUC, 1).

Diagnosis.

2.6-2.8 mm long (mean = 2.7 mm; n = 2); 2.16-2.36 × as long as wide. This species is distinguished by the mesonotal mycangial tuft the length of the scutellum; elytral disc with a weak to moderate transverse saddle-like depression; posterolateral margin costate to interstriae 5; declivity appearing bisulcate, moderately impressed from striae 1 and 2, interstriae 3 strongly inflated, tuberculate from summit to apical 1/4 then becoming flattened and unarmed to apex; and moderate sharp backwardly pointed spine at base of declivital interstriae 2.

This species strongly resembles A. apicalis and A. cristatus and is most easily distinguished by the smaller size, more strongly impressed declivital sulci than A. apicalis and larger spines on interstriae 3 that are sharply pointed but not strongly backwardly hooked.

Similar species.

Anisandrus apicalis , A. cristatus , A. geminatus , A. niger , A. sinivali .

Description

(female). 2.6-2.8 mm long (mean = 2.7 mm; n = 2); 2.16-2.36 × as long as wide. Body uniformly dark brown, except dark red-brown declivity. Legs and antennae light 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 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 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: 1.0 × as long as wide. In dorsal view rounded, type 1, sides convex, rounded anteriorly; anterior margin with a row of four serrations. In lateral view robust and rounded, type 5, disc as long as anterior slope, summit at midpoint. Anterior slope with densely spaced, large coarse asperities, becoming lower and more strongly transverse towards summit. Disc subshiny, alutaceous with sparse fine punctures bearing short, 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: 1.5 × as long as wide, 1.5 × 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 with a weak to moderate medial transverse saddle-like depression, striae not impressed, with small, deep punctures separated by two diameters of a puncture, setose, setae as long as a puncture, recumbent, hair-like; interstriae flat, punctate, punctures uniseriate subequal to those of striae, setose, setae 1 × width of interstriae 2, erect, hair-like, unarmed by granules. Declivity occupying approximately 1/2 elytra, evenly rounded, declivital face weakly bisulcate, moderately impressed from striae 1 and 2, interstriae 3 strongly inflated, tuberculate from summit to apical 1/4 then becoming flattened and unarmed to apex; striae not impressed, strial punctures much larger and deeper than those of disc, and bearing setae as described for disc; interstriae impunctate, sparsely minutely granulate, setae 1-2 × width of interstriae 2, erect, hair-like, interstriae 2 as wide as interstriae 3 at midpoint of declivity, declivital summit with a moderate sharp backwardly pointed spine at base of declivital interstriae 2. Posterolateral margin costate to interstriae 5. 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 seven large socketed denticles, their length longer than basal width. Meso- and metatibiae flattened; outer margins evenly rounded with eight and ten large socketed denticles, respectively.

Etymology.

L. congruens = agreeing with. In reference to its similarity to apicalis and cristatus. A participle.

Distribution.

Thailand, Vietnam.

Host plants.

Unknown.

Figures

Figure 19. Dorsal, lateral and declivital view of Anisandrus carinensis holotype, 4.5 mm (A, B, I), A. congruens holotype, 2.6 - 2.8 mm (C, D, J), A. cristatus, 3.35 - 3.7 mm (E, F, K), and A. cryphaloides holotype, 2.1 - 2.4 mm (G, H, L).