Taxonomic history

Phloeotrogus bidentatus Motschulsky, 1863: 514.

Xyleborus bidentatus (Motschulsky): Eichhoff, 1878b: 505


Xyleborus subcostatus Eichhoff, 1869a: 281. Hulcr and Cognato 2013: 150.

Xyleborus riehlii Eichhoff, 1878b: 346. Schedl 1963a: 282.

Progenius fleutiauxi Blandford, 1896a: 21Hulcr and Cognato 2013: 150.

Xyleborus laeviusculus Blandford, 1896a: 21. Schedl 1960b: 108.

Boroxylon stephegynis Hopkins, 1915a: 58. Wood 1960: 54.

Boroxylon webbi Hopkins, 1915a: 59. Hulcr and Cognato 2013: 150.

Xyleborus subcostatus dearmatus Eggers, 1923: 205. Hulcr and Cognato 2013: 150.

Xyleborus brevidentatus Eggers, 1930: 190. Schedl 1960b: 107.

Xyleborus quadridens Eggers, 1930: 191. Wood 1989: 176.


3.40−3.50 mm long (mean = 3.48 mm; n = 5); 2.50−2.69 times as long as wide. This species is distinguished by the acuminate elytral apex; elytra broadest at apical third, declivity gently sloped, almost concave near apex; protibia slender, abruptly broadened and triangular on distal third, apical mucro very large, prominent; pronotum quadrate (type 4) when viewed dorsally, anterior margin conspicuously extended anteriad with prominent serrations; pronotum strongly asperate on apical half, disc weakly serrate; declivital interstriae 2 with a large spine; and large size.

May be confused with

Ambrosiodmus spp.


Australia, ‘Borneo', India (Andaman Is, Nicobar Is., West Bengal), Indonesia (Java, Sulawesi, Maluku, Sumatra, Sumbawa), East & West Malaysia, Myanmar, New Guinea, Palau, Philippines, Singapore, Taiwan, Thailand, Vietnam; also recorded from East Africa and Madagascar

Host plants

polyphagous (Schedl 1963a)


Murphy and Meepol (1990) suggest an association with mangroves in southern Thailand, as do Maiti and Saha (2004) in the Sundarbans and Andaman Islands, but overall the species is polyphagous.

DNA data

specimens not available for sequencing