Taxonomic history

Xyleborus haberkorni Eggers, 1920: 43.

Diuncus haberkorni (Eggers): Hulcr and Cognato, 2009: 31.

Synonyms

Xyleborus approximatus Schedl, 1951a: 77Hulcr and Cognato, 2013: 80.

Xyleborus taichuensis Schedl, 1952b: 64Beaver and Liu, 2010: 26.

Xyleborus potens Schedl, 1964a: 298. Synonymy: Schedl 1975e: 35 (as synonym of X. approximatus).

Diagnosis

1.9−2.8 mm long (mean = 2.28 mm; n = 5); 2.11−2.38 times as long as wide. This species can be distinguished by the elytral summit armed by two pairs of large denticles, one pair on interstriae 2 and the other on interstriae 3; pronotum about as long as wide, summit at midpoint, basal half punctate; declivity appearing weakly bisulcate; and interstriae 1, 3−6 flat to weakly convex giving the declivity a finely sculptured appearance.

May be confused with

Diuncus mucronatus, D. mucronatulus, and D. quadrispinulosus

Distribution

Bangladesh, China (Fujian, Guangdong, Guangxi, Hainan, Hong Kong, Jiangxi, Yunnan), India (Andaman Is, Assam, Arunachal Pradesh, Tamil Nadu, Uttarakhand, West Bengal), Indonesia (Java), Japan (Ryukyu Is), East & West Malaysia, New Guinea, South Korea, Sri Lanka, Taiwan, Thailand, Vietnam. Imported to Africa (South Africa, Tanzania)

Host plants

Polyphagous (Beeson 1930, Browne 1961b). The species is sometimes associated with other xyleborines (Beaver and Browne 1978, Hulcr and Cognato 2010b), but may also occur alone (Hulcr and Cognato 2009).

DNA data

Sequences available for COI and CAD.

COI: MN619906MN619907MN619908

CAD: MN620187MN620188