Ambrosiodmus asperatus (Blandford, 1895)

Smith, Sarah M., Beaver, Roger A. & Cognato, Anthony I., 2020, A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China, ZooKeys 983, pp. 1-442 : 1

Ambrosiodmus asperatus (Blandford, 1895) Fig. 11A, B, I

Xyleborus asperatus Blandford, 1895: 321.

Ambrosiodmus asperatus (Blandford): Wood 1989: 169.

Xyleborus nepotulus Eggers, 1923: 179. Synonymy: Schedl 1958c: 151.

Xyleborus citri Beeson, 1930: 215. Synonymy: Wood 1989: 169.

Xyleborus nepotulomorphus Eggers, 1936b: 88. Synonymy: Schedl 1958c: 151.

Type material.

Holotype Xyleborus asperatus (NHMUK). Paratype Xyleborus nepotulomorphus (MFNB).

New records.

China: Guangxi, Shiwandashan, 25.iii.2018, Y. Li, ex Quercus griffithii (UFFE, 1). Hong Kong, Tai Po Kau, vi.2017, J. Skelton (MSUC, 1). Japan: South-western Japan, Okinawa, Iriomote-jima Island, H. Kajimura, ex Machilus thunbergii tree (MSUC, 1). Vietnam: Thua Thien-Hue, Bach Ma N.P., 16.22897, 107.85349, 415 m, 15.ii.2017, VN57, A.I. Cognato, T.A. Hoang, ex 5 cm diameter branch; twig (MSUC, 1).

Diagnosis.

2.5-2.8 mm long (mean = 2.64 mm; n = 5); 2.4-2.8 × as long as wide. This species is distinguished by declivital interstriae 2 bearing a row of 3-5 denticles that are larger than those on other interstriae, and declivital interstriae 1 distinctly impressed.

Similar species.

Ambrosiophilus cristatulus , A. osumiensis , A. subnepotulus .

Distribution.

Australia, Brunei, China (Guizhou, Guangxi*, Hainan, Hong Kong*, Xizang), India (Tamil Nadu, West Bengal), Indonesia (Java, Sulawesi, Sumatra), Japan (Ryukyu Is), West Malaysia, Nepal, New Guinea, Sri Lanka, Taiwan, Thailand, Vietnam*.

Host plants.

Polyphagous ( Beaver and Liu 2010).

Remarks.

This species has a very similar appearance and size to several Ambrosiophilus species which also have three or four denticles on declivital interstriae 2. The two genera are easily separated by the pronotal disc sculpturing: punctate in Ambrosiophilus and asperate in Ambrosiodmus .

Figures

Figure 11. Dorsal, lateral and declivital view of Ambrosiodmus asperatus, 2.5 - 2.8 mm (A, B, I), A. brunneipes, 3.2 - 3.4 mm (C, D, J), A. conspectus paratype, 2.9 - 3.1 mm (E, F, K), and A. lewisi, 3.4 - 4.8 mm (G, H, L).