Taxonomic history

Xyleborus sibsagaricus Eggers, 1930: 196.

Euwallacea sibsagaricus (Eggers): Wood, 1989: 173.

Synonyms

Xyleborus dalbergiae Eggers, 1930: 196. Wood, 1989: 173.

Xyleborus tonkinensis Schedl, 1934a: 39. Smith et al. 2020b: 254.

Diagnosis

3.4−3.9 mm long (mean = 3.58 mm; n = 5); 2.77−2.83 times as long as wide. This species is distinguished by its slender form; posterolateral margin of declivity costate and granulate, pronotum appearing subquadrate when viewed dorsally (type 3); protibia outer margin distinctly triangular bearing five short, broad obtuse denticles; strial punctures approximately the same size on disc and declivity; declivity very steep; and declivital surface strongly shining.

May be confused with

Euwallacea luctuosus, E. subalpinus, Heteroborips tristis

Distribution

China (Yunnan), India (Arunachal Pradesh, Assam, Meghalaya, West Bengal), Indonesia (Maluku), East Malaysia, Philippines, Vietnam

Host plants

recorded from Casearia (Flacourtiaceae), Ehretia (Ehretiaceae) and Sapium (Euphorbiaceae) (Beeson 1961), and Hevea brasiliensis (Euphorbiaceae)

DNA data

Sequences available for COI and CAD.

COI: MN619945

CAD: MN620226