Taxonomic history

Arixyleborus silvanus Smith, Beaver & Cognato 2020 (in Smith et al. 2020b): 132.

Diagnosis

1.65–1.8 mm long (mean = 1.72, n = 5); 2.6–2.7 times as long as wide. Distinguished by the protibia posterior face inflated and granulate; elongate body form and steeply sloping elytral declivity, the posterolateral margin with a series of granules; pronotal summit distinctly anterior to middle; elytral disc with striae impressed on posterior part; and interstriae 1-3 extending to apex of declivity and armed with uniseriate granules.

Arixyleborus silvanus is distinguished from A. mediosectus by its less elongate form (2.9–3.3 times as long as wide in mediosectus), and less elongate pronotum (1.1–1.2 times longer than wide vs 1.3 times in mediosectus), the more coarsely granulate interstriae, and more deeply impressed striae at the apex of the elytral disc, and the presence of fine hair-like setae on the declivity rather than coarse setae. It can be further distinguished from the closely related A. crassior by the more elongate form (2.5 times as long as wide in A. crassior), more stout pronotum (1.1–1.2 ×longer than wide vs 1.3 times in A. crassior), the more coarsely granulate interstriae, and weakly impressed striae at the apex of the elytral disc, and the presence of fine hair-like setae on the declivity rather than coarse setae.

May be confused with

Arixyleborus crassior, A. mediosectus, and A. phiaoacensis

Distribution

China (Hainan), Thailand

Host plants

unknown (Smith et al. 2020b)

DNA data

Sequences available for COI and CAD.

COI: MN619864

CAD: MN620155