Arixyleborus crassior Smith, Beaver & Cognato 2020 (in Smith et al. 2020b): 115.
2.0 mm long (n = 1); 2.5 times as long as wide. This species is distinguished by the protibia posterior face inflated and granulate; antennal club broader than tall; pronotum lateral margin oblique; pronotum anterior margin without serrations; and posterolateral carina acute, granulate.
It can be further distinguished from the closely related A. silvanus by the more stout form (2.6–2.7 times as long as wide in A. silvanus), more elongate pronotum (1.3 times longer than wide vs 1.1–1.2 times in A. silvanus), the more finely granulate interstriae, moderately impressed striae at the apex of the elytral disc, and the presence of short coarse setae on the declivity rather than fine hair-like setae. It can be further distinguished from the closely related A. mediosectus by the more stout form (2.86–3.33 times as long as wide in mediosectus) and short coarse setae on the declivity.
Arixyleborus mediosectus, A. phiaoacensis, and A. silvanus
India (Arunachal Pradesh, Bihar, West Bengal)
recorded from Castanopsis (Fagaceae) (Smith et al. 2020b)
specimens not available for sequencing