Arixyleborus crassior

Taxonomic history

Arixyleborus crassior Smith, Beaver & Cognato 2020 (in Smith et al. 2020bSmith et al. 2020b:
Smith SM, Beaver RA, and Cognato AI. 2020b. A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China. ZooKeys 983: 1-442. https://doi.org/10.3897/zookeys.983.52630): 115.

Diagnosis

2.0 mm long (n = 1); 2.5 times as long as wide. This species is distinguished by the protibiaprotibia:
tibia of the first pair of legs
posteriorposterior:
toward the rear end; opposite of anterior
face inflatedinflated:
blown up; distended
and granulate; antennalantennal:
pertaining to the antennae
club broader than tall; pronotumpronotum:
the dorsal surface of the thorax
laterallateral:
pertaining to the side
margin oblique; pronotumpronotum:
the dorsal surface of the thorax
anterioranterior:
the front or forward; opposite of posterior
margin without serrations; and posterolateralposterolateral:
relating to end of the side part/portion
carinacarina:
an elevated ridge or keel, not necessarily high or acute
acute, granulategranulate:
pertaining to a coarse, grainy surface texture
.

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 pronotumpronotum:
the dorsal surface of the thorax
(1.3 times longer than wide vs 1.1–1.2 times in A. silvanus), the more finely granulategranulate:
pertaining to a coarse, grainy surface texture
interstriae, moderately impressedimpressed:
a depression in a surface
striae at the apexapex:
point or edge furthest from the body; opposite of base
of the elytralelytral:
pertaining to the elytra
discdisc:
the flat central upper surface of any body part (e.g. pronotum and elytra)
, and the presence of short coarse setaeseta:
small hair-like or scale-like structure
on the declivitydeclivity:
downward slope of either the pronotum or elytra
rather than fine hair-like setaeseta:
small hair-like or scale-like structure
. 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 setaeseta:
small hair-like or scale-like structure
on the declivitydeclivity:
downward slope of either the pronotum or elytra
.

May be confused with

Arixyleborus mediosectus, A. phiaoacensis, and A. silvanus

Distribution

India (Arunachal Pradesh, Bihar, West Bengal)

Host plants

recorded from Castanopsis (Fagaceae) (Smith et al. 2020bSmith et al. 2020b:
Smith SM, Beaver RA, and Cognato AI. 2020b. A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China. ZooKeys 983: 1-442. https://doi.org/10.3897/zookeys.983.52630)

DNA data

specimens not available for sequencing