Truncaudum Hulcr & Cognato, 2010

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

Truncaudum Hulcr & Cognato, 2010

Truncaudum Hulcr & Cognato, 2010a: 24.

Type species.

Xyleborus impexus Schedl, 1942b; original designation.

Diagnosis.

Small to moderately sized, somewhat elongate (1.9-2.9 mm, 2.44-2.9 × as long as wide) and densely pubescent. Truncaudum is distinguished by the declivity obliquely or abruptly truncate; pronotum elongate without distinct serrations on anterior margin; protibiae semi-circular with evenly rounded outer margin; scutellum visible, procoxae contiguous, mycangial tufts absent.

The two species in Southeast Asia are strikingly similar to several small Cyclorhipidion species and is distinguished by the obliquely truncate (type 2) antennal club while those of Cyclorhipidion are flat and types 3, 4, 5.

Similar genera.

Amasa , Cyclorhipidion , Pseudowebbia .

Distribution.

Found throughout the Paleotropics and Australasia with one species occurring in Africa.

Gallery system.

The gallery system has a few branches, usually in the transverse plane, and at least one brood chamber in the longitudinal plane ( Browne 1961b).