Immanus desectus (Eggers, 1923)

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

Immanus desectus (Eggers, 1923) Fig. 64A, B, E

Xyleborus desectus Eggers, 1923: 167.

Ambrosiodmus desectus (Eggers): Wood and Bright 1992: 672.

Immanus desectus (Eggers): Beaver et al. 2014: 53.

Xyleborus desectus arduus Schedl, 1942a: 188. Synonymy: Wood and Bright 1992: 673.

Type material.

Lectotype (NMNH).

New records.

Thailand: [Prachuap Khiri Khan]: Kui Buri N.P., 27.iii.2006, Dole et al., ex “Krachid” dead standing trunk (MSUC, 7). Vietnam: Tonkin, Hoa-Binh region, A. DeCooman, 1940 (MNHN, 2).

Diagnosis.

5.0-5.5 mm long (mean = 5.2 mm; n = 5); 2.27-2.5 × as long as wide. Most closely resembles I. colossus (Blandford, 1896), which occurs in Papua New Guinea. Immanus desectus is distinguished by the smaller size; truncate declivity with a circumdeclivital costa; and two or three denticles on declivital interstriae 2 rather than a row of denticles.

Similar species.

Immanus colossus (from Papua New Guinea), I. sarawakensis .

Distribution.

Indonesia (Java), West Malaysia, Philippines, Thailand, Vietnam.

Host plants.

Recorded only from Castanospermum ( Fabaceae ) ( Kalshoven 1959b).

Figures

Figure 64. Dorsal, lateral and declivital view of Immanus desectus, 5.0 - 5.5 mm (A, B, E), and I. sarawakensis holotype, 7.0 - 7.8 mm (C, D, F).