Taxonomic history

Xyleborus inarmatus Eggers, 1923: 209.

Cyclorhipidion inarmatum (Eggers): Beaver et al., 2014: 39.

Synonyms

Xyleborus vagans Schedl, 1977: 504. Smith et al. 2020b: 188.

Diagnosis

2.8−3.0 mm long (mean = 2.9 mm; n = 3); 2.8−3.0 times as long as wide. This species is distinguished by the short, steep declivity that is approximately 25% of total elytral length, armed with large tubercles on interstriae 1 and 3, interstriae 2 always unarmed; posterolateral margins rounded; and declivital interstriae 1 setae in two confused rows, interstriae 2 setae uniseriate.

May be confused with

This species is a part of a challenging species group consisting of Cyclorhipidion bodoanum, C. distinguendum, C. pelliculosum, C. tenuigraphum, and C. xeniolum. They can be most readily separated using Smith et al. (2020b) table 1:

species

declivital interstriae 1 setae

declivital interstriae 2 setae

lateral profile of declivity

declivital interstriae 2 granulate

 total length (mm)

xeniolum

uniseriate

uniseriate

obliquely truncate

unarmed

1.65−1.8

bodoanum

uniseriate

uniseriate

steeply rounded

unarmed

1.7−2.2

inarmatum

2 rows, confused

uniseriate

steeply rounded

unarmed

2.8−3.0

tenuigraphum

2 rows, confused

2 rows, confused

steeply rounded

often on apical third

2.7−3.0

pelliculosum

3 rows, confused

uniseriate

steeply rounded

unarmed

3.2−3.5

distinguendum

3 rows, confused

2 rows, confused

steeply rounded

unarmed

2.5−3.1

Distribution

Bhutan, China (Yunnan), India (Himachal Pradesh, West Bengal), Indonesia (Sumatra), Laos, Myanmar, Thailand, Vietnam

Host plants

recorded from Castanopsis and Quercus (Fagaceae), and probably with a close association with Fagaceae (Beaver et al. 2014)

DNA data

Sequences available for COI and CAD.

COI: MN199579

CAD: MN199596