Taxonomic history

Xyleborus validus Eichhoff, 1876a: 202.

Euwallacea validus (Eichhoff): Wood and Bright, 1992: 694.

Diagnosis

3.9−4.1 mm long (mean = 4.0 mm; n = 5); 2.50−2.73 times as long as wide. This species is distinguished by the pronotum appearing subquadrate (type 3) from dorsal view; outer margin of protibia round, declivital interstriae 1 granulate; posterolateral margin of declivity carinate never granulate; and moderately large size.

It can be further separated from the strongly morphologically similar species E. interjectus by the declivity steeply sloped; declivital strial punctures deep giving the declivity a rugged appearance; and tubercles mostly absent from the apical half of interstriae 2.

May be confused with

Euwallacea funereus, E. interjectus, and E. velatus

Distribution

China (Anhui, Chongqing, Fujian, Hubei, Yunnan), Japan, Nepal, South Korea, Taiwan, Vietnam; introduced and established in USA (Wood 1975, Cognato et al. 2015, Gomez et al. 2018a)

Host plants

polyphagous, attacking both gymnosperm and angiosperm trees (Wood and Bright 1992)

DNA data

Sequences available for COI and CAD.

COI: HM064087

CAD: HM064268

Additional COI sequences from across Asian and North Ameircan populations are given in Cognato et al. 2015.