Fortiborus Hulcr and Cognato, 2010a: 17.
Fortiborus are among the largest xyleborines in Southeast Asia (4.8−6.6 mm long and 2.52−3.06 times as long as wide). Fortiborus is distinguished by the pronotum robust; elytral declivity flattened and broadened laterally, apex angulate; anterior edge of pronotum extended anteriad, bearing a distinct row of serrations; antennal club distinctly pubescent, type 4; eyes very large, deeply emarginate; scutellum flat, flush with elytra; procoxae contiguous; and mycangial tufts absent.
Similar to some large Euwallacea species, except margin of segment 1 of antennal club concave and recurved; anterior edge of pronotum produced anteriad, bearing row of serrations; protibiae rounded, with seven or more denticles.
Euwallacea and Xyleborus
throughout Southeast Asia and Oceania
The galleries are regularly branched in one transverse plane and are without brood chambers (Browne 1961b).
The species of this genus are all closely associated with Dipterocarpaceae and are not definitely known to breed in other families of trees.