Taxonomy

Anisandrus Ferrari, 1867: 24.

Diagnosis

2.1−5.9 mm long, 1.88−2.78 times as long as wide, body usually stout and dark. Anisandrus can be distinguished most easily by the antennal club type 1 (obliquely truncate) (A. n. sp. 2 type 2); club taller than wide (A. n. sp. 2 wider than tall); procoxae narrowly separated; protibia slender, distinctly triangular, outer margin with 5−8 large socketed denticles on distal half, posterior face unarmed; mesonotal mycangial tufts typically present along the pronotal base (missing in three species), either as a small tuft the length of the scutellum and directly opposite it or extending laterally from the scutellum to striae 3 and with elytral base broadly, shallowly emarginated from the scutellum to striae 3. Additional diagnostic characters include the pronotum from dorsal view typically types 0 and 1 (A. n. sp. 11, type 6), pronotum from lateral view tall (type 3), or rounded and robust (type 5), anterior margin with a row of asperities or serrationsscutellum flat, flush with elytra; and the elytral disc either convex or variously transversely impressed with a saddle-like depression. Species range from nearly glabrous to densely setose and are typically black or dark brown.

May be confused with

Cnestus, Cyclorhipidion, Hadrodemius, Xylosandrus. Anisandrus is closely related to Cnestus, Hadrodemius and Xylosandrus, all of which possess a mesonotal mycangium and the associated dense tuft of hairs at the scutellar area and pronotal base (Gohli et al. 2017, Johnson et al. 2018).

Distribution

Uncommon genus with species occurring in forests of the Holarctic and Paleotropic regions with greatest species diversity in montane habitats.

Gallery system

The species usually attack stems of small diameter, and the gallery system consists of a radial or circumferential gallery with several longitudinal branches without brood chambers.

Remarks

This genus is remarkably diverse in montane habitats across Asia, but most species are poorly known. It is very likely that many new species await description.