Truncaudum Hulcr and Cognato, 2010a: 24.
Small to moderately sized, somewhat elongate (1.90−2.90 mm long, 2.44−2.90 times as long as wide), and densely pubescent. The genus is recognized by the declivity obliquely or abruptly truncate; pronotum elongate without distinct serrations on anterior margin; scutellum visible; procoxae contiguous; and mycangial tufts absent. The two species in Southeast Asia are strikingly similar to several small Cyclorhipidion species and can be distinguished by the type 2 antennal club (Cyclorhipidion has types 3, 4, 5).
Amasa, Cyclorhipidion, and Pseudowebbia
found throughout the Paleotropics and Australasia with one species occurring in Africa
The gallery system has a few branches, usually in the transverse plane, and at least one brood chamber in the longitudinal plane (Browne 1961b).