Microperus kirishimanus (Murayama, 1955)

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

Microperus kirishimanus (Murayama, 1955) Fig. 67G, H, L

Xyleborus kirishimanus Murayama, 1955: 85.

Coptodryas kirishimanus (Murayama): Wood and Bright 1992: 825.

Microperus kirishimanus (Murayama): Beaver and Liu 2010: 28.

Type material.

Syntypes (NMNH, 4).

Diagnosis.

1.6-1.8 mm long (mean = 1.69 mm; n = 5); 2.43-2.75 × as long as wide. This species is distinguished by the elytral disc flat with short and steep obliquely truncate declivity; posterolateral carina denticulate; declivital interstriae straight from base to apex, never laterally broadened; denticles on declivital summit and margins larger, more sharply acute and denser than those on declivital face.

Similar species.

Microperus latesalebrinus , M. nudibrevis , M. perparvus .

Distribution.

Japan, Taiwan.

Host plants.

Recorded from Ilex ( Aquifoliaceae ), Castanopsis , and Quercus ( Fagaceae ) (Nobuchi 1981d).

Remarks.

Murayama (1955) states the type series of Xyleborus kirishimanus is comprised of 21 males. Given the heavily female biased sex ratio and biology of male xyleborines it is dubious that 21 males could have been collected and not a single female. This suspicion was confirmed by examination of four syntypes examined by SMS and AIC, all of which are female.

Figures

Figure 67. Dorsal, lateral and declivital view of Microperus diversicolor, 1.6 - 1.8 mm (A, B, I), M. fulvulus lectotype, 2.8 - 2.95 mm (C, D, J), M. kadoyamaensis, 1.8 - 2.0 mm (E, F, K), and M. kirishimanus, 1.6 - 1.8 mm (G, H, L).