Taxonomic history

Xyleborus pelliculosus Eichhoff, 1878a: 392.

Cyclorhipidion pelliculosum (Eichhoff): Hulcr and Cognato, 2010a: 12.

Synonyms

Xyleborus seiryorensis Murayama, 1930: 25Knížek, 2011: 243.

Xyleborus quercus Kurentzov, 1948: 51. Knížek, 2011: 243.

Xyleborus starki Nunberg, 1956: 209. New name for X. quercus Kurentzov nec Hopkins 1915. Knížek, 2011: 243.

Diagnosis

3.2−3.5 mm long (mean = 3.3 mm; n = 5); 2.67−3.0 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 3 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. inarmatum, 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

China (Shanxi, Sichuan), Japan, South & North Korea, Russia (Far East), Taiwan. Imported to USA (Atkinson et al. 1990).

Host plants

Most records are from Castanopsis and Quercus (Fagaceae), but the species has also been recorded from Acer (Aceraceae), Juglans (Juglandaceae), and from Alnus and Betula (Betulaceae) (Mandelshtam et al. 2018; Smith et al. 2020b)

DNA data

Sequences available for COI and CAD.

COI: GU808702

CAD: GU808624