Arixyleborus granifer (Eichhoff, 1878)

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

Arixyleborus granifer (Eichhoff, 1878) Fig. 25E, F, K

Xyleborus granifer Eichhoff, 1878a: 391.

Arixyleborus granifer (Eichhoff): Browne 1955: 350.

Xyleborus granifer borneensis Schedl, 1965: 27. Synonymy: Wood and Bright 1992: 666.

Type material.

Syntype(s) in UHZM destroyed in World War II ( Wood and Bright 1992).

New records.

China: Yunnan, Banna, 24.i.2018, Shengchang Lai, ex Hevea brasiliensis (UFFE, 1). Laos: Kham Mouan, Ban Khun Ngeun, 18°07'N, 104°29'E, ~ 200 m, 24-29.iv.2001, Pacholátko (NHMB, 1). Louangphrabang, Ban Song Cha (5 km W), 20°33-4'N, 102°14'E, 1200 m, 1-16.iv.1999, V. Kubáň (RABC, 1); as previous except: Thong Khan, 19°55'N, 101°58'E, ~ 750 m, 11-21.v.2002 (NHMB, 3; RABC, 2).

Diagnosis.

2.8-3.0 mm long (mean = 2.94 mm; n = 5); 2.23-2.31 × as long as wide. This species is distinguished by the protibiae posterior faces flat, unarmed; antennal club as broad as tall; posterolateral carina oblique, granulate; elytral disc with weak transverse saddle-like depression; and moderate size.

Similar species.

Arixyleborus titanus .

Distribution.

Borneo, China* (Yunnan), Laos*, East & West Malaysia, Myanmar, Philippines, Thailand.

Host plants.

Polyphagous. The frequent records from Dipterocarpaceae may simply reflect the abundance of this family in the forests of the region rather than indicating a preference for the family ( Beaver et al. 2014).

Remarks.

The supposed syntype in MIZ (Wegrzynowicz and Mokrzycki 1996) is actually a specimen of Xyleborus ferrugineus (F.) (RAB pers. obs.).

Figures

Figure 25. Dorsal, lateral and declivital view of Arixyleborus crassior holotype, 2.0 mm (A, B, I), A. grandis, 3.2 - 3.5 mm (C, D, J), A. granifer, 2.8 - 3.0 mm (E, F, K), and A. granulifer, 1.9 - 2.0 mm (G, H, L).