Taxonomic history

Xylosandrus borealis Nobuchi, 1981b: 34

Diagnosis

2.0−2.2 mm long (mean = 2.12 mm; n = 5); 2.0 times as long as wide. This species can be distinguished by its moderate size; elytral disc flat, longer than declivity; declivital face steep, abruptly separated from disc; elytra appearing obliquely truncate; posterolateral margins of elytra carinate to interstriae 7; declivital face with four apparent granulate striae (striae 5 short, converging with striae 4 forming a loop); declivital face convex; striae setose, setae semi-recumbent hairs and equal to the width of an interstria; interstriae granulate, granules multiseriate, confused with a uniseriate row of very long erect hair-like setae longer than the width of two interstriae and confused semi-erect setae about the width of an interstria; strial granules large, 1−1.5 times larger than those of interstriae; pronotum longer than wide, from dorsal view conical frontally (type 6) and lateral view taller (type 2), summit at basal quarter, basal quarter shagreened, dull, densely punctate; and broad, dense mycangial tuft on the pronotal base.

May be confused with

Xylosandrus beesoni, X. discolor, and X. diversepilosus

Distribution

China (Guangdong, Hong Kong), Japan, Korea, Taiwan

Host plants

Camellia (Theaceae) and Styrax (Styracaceae) (Dole and Cognato 2010)

DNA data

Sequences available for COI and CAD.

COI: MN620063MN620064MN620065

CAD: MN620329MN620330