Taxonomic history

Xyleborus justus Schedl, 1931: 339.

Diuncus justus (Schedl): Hulcr and Cognato, 2009: 32.


Xyleborus marginicollis Schedl, 1936c: 64. Hulcr, 2010: 107.

Xyleborus ciliatus Eggers, 1940: 141. Hulcr and Cognato, 2013: 81.

Xyleborus apiculatus Schedl, 1942a: 190. Hulcr and Cognato, 2013: 81.


1.5−1.7 mm long (mean = 1.65 mm; n = 5); 2.36−2.5 times as long as wide. This species can be distinguished by the minute size; unarmed declivity; declivital striae 1 shallowly impressed; nearly glabrous appearance; and lateral margin of the protibia armed with four denticles.

May be confused with

Diuncus ciliatoformis


Australia, China (Fujian), Indonesia (Java), East & West Malaysia, New Guinea, Vietnam

Host plants

This species has only been recorded from Cunninghamia (Cupressaceae), but it likely occurs on angiosperms as well (Smith et al., 2020b).

DNA data

Sequences available for COI and CAD.

COI: MN619909MN619910

CAD: MN620189