Taxonomic history

Bostrichus exiguus Walker, 1859: 260.

Xyleborinus exiguus (Walker): Maiti and Saha, 1986: 109.

Synonyms

Xyleborus muriceus Eichhoff, 1878a: 392. Eggers, 1925: 154.

Xyleborus diversus Schedl, 1954b: 80. Smith et al. 2020b: 345.

Xyleborus perexiguus Schedl, 1971b: 381. Hulcr and Cognato, 2013: 142.

Xyleborus ankius Schedl, 1975c: 361. Hulcr and Cognato, 2013: 142.

Diagnosis

1.8−2.0 mm long (mean = 1.88 mm; n = 5); 2.57−3.0 times as long as wide. This species is distinguished by the declivital face with interstriae 2 unarmed by tubercles; elytral apex attenuate, with three (usually) pairs of large flattened tubercles; and declivital interstriae flat, interstriae 2 not impressed.

May be confused with

Xyleborinus huifenyinae, X. perpusillus, and X. tritus

Distribution

recorded in the study region from India (Andaman Is.), Cambodia, China (Jiangxi, Yunnan), Laos, Myanmar, Nepal, Taiwan, Thailand, Vietnam; also recorded from Australia, Cook Is., Federated States of Micronesia, Fiji, Guam, Indonesia (Java, Maluku, Sulawesi, Sumatra), East & West Malaysia, Mariana Is., New Guinea, Niue I., Philippines, Samoa, Solomon Is., Tahiti; introduced to West Africa (Angola, Congo, Equatorial Guinea, Gabon, Ghana, Ivory Coast) (Beaver 2005, Wood and Bright 1992) and Central America (Costa Rica, Panama) (Kirkendall and Ødegaard 2007)

Host plants

polyphagous (Browne 1961b)

Remarks

Kalshoven (1959b) gives details of brood sizes in various hosts in relation to the size of the brood chamber.

DNA data

Sequences available for COI and CAD.

COI: HM064109MN620021MN620022

CAD: MN620288MN620289