Cyclorhipidion vigilans (Schedl, 1939)

Sittichaya, Wisut, Smith, Sarah M. & Beaver, Roger A., 2019, Ten newly recorded species of xyleborine ambrosia beetles (Coleoptera, Curculionidae, Scolytinae, Xyleborini) from Thailand, ZooKeys 862, pp. 109-127 : 121-123

Cyclorhipidion vigilans (Schedl, 1939) Fig. 11 A–E

Xyleborus vigilans Schedl, 1939: 43.

Cyclorhipidion vigilans (Schedl): Wood and Bright 1992: 704.

Diagnosis.

Large, 5.5 mm long (N = 5); elongate, 2.45−2.48 times longer than wide; pronotum with less vestiture than elytra, elytra densely covered with interstrial setae, density of vestiture varies; brown to dark brown in color; pronotum from dorsal view basic shape, anterior margin subquadrate, sides parallel (type 3; Hulcr et al. 2007), 1.55 times longer than wide, from lateral view lateral view rounded, robust (type 5; Hulcr et al. 2007), anterior margin extended anteriad, armed with 4−6 medium sized serrations, anterior half of pronotum asperate, base shagreened; elytra elongate, gradually tapering from base posteriorly, discal striae punctate, clearly impressed, interstriae two times broader than striae, covered with fine hair-like setae, setae longer posteriorly, discal striae and interstriae 1−3 laterally diverging from suture at basal third, declivital striae irregularly punctate, interstria granulate, posterolateral carina granulate, extending from apex to interstriae 7.

Material examined.

THAILAND, Ton Nga Chang Wildlife Sanctuary, Songkhla Province, 6°59'32.1"N, 100°08'57.8"E, tropical rainforest, ethanol-baited trap, 01.i.2014 (1), 01.iii.2014 (1), 01.iv.2015 (3) (W. Sittichaya).

Distribution.

East and West Malaysia, Indonesia (Java). New to Thailand.

Biology.

Recorded only from 'kalapa tjoeng’ ( Horsfieldia glabra (Reinw. ex Blume) Warb.) ( Myristicaceae ) ( Schedl 1939).

Remarks.

This species can be distinguished by the large size, and anterior margin of pronotum extended anteriad and armed with 4−6 medium sized serrations; elytra elongate tapering from base to angularly rounded apex, discal striae 1‒3 impressed, interstriae 2 widened and outwardly curved in middle of disc, interstriae 3 correspondingly narrowed, interstriae granulate on upper part of declivity. This species is similar to species in the genus Fortiborus , but the body is densely covered with long hairs and the lower part of the eye is larger than the upper part.

Figures

Figure 11. Cyclorhipidion vigilans (Schedl, 1939) A lateral view B dorsal view C posterolateral view D front E declivity.