Genyocerus biporus (Schedl)

Beaver, R. A. & L. - Y, 2007, A review of the genus Genyocerus Motschulsky (Coleoptera: Curculionidae: Platypodinae), with new synonyms and keys to species, Zootaxa 1576 (1), pp. 25-56 : 33

Genyocerus biporus (Schedl)

( Figs 1–4 )

Diacavus biporus Schedl, 1942: 217 .

Genyocerus biporus (Schedl) : Browne, 1977: 97.

Diacavus intermedius Browne, 1968: 134 . n. syn.

Taxonomy: We have compared the male lectotype of D. biporus (NMW) and a further male determined by Schedl with a long series of both sexes in RAB's collection, which had earlier been compared to the male holotype and male and female paratypes of D. intermedius (BMNH) . Only a single species is represented. Browne (1968) suggested that the two species were distinguishable by the smaller size of G. biporus and differences in the shape of the elytral teeth of the male. However, it seems possible that he had not examined the lectotype of G. biporus , because his description of the elytral teeth of G. biporus as 'of subequal breadth and truncate' is incorrect and apparently based on a misidentified specimen in BMNH. The elytral teeth have the same form in the male types of both species.

Distribution: The species is distributed from northeastern India (Assam) through Southeast Asia to Indonesia and the Philippines. It has often been intercepted in Japan in timber from the region but is not known to be established there.

Biology: Recorded only from genera belonging to the family Dipterocarpaceae ( Anisoptera , Dipterocarpus , Dryobalanops , Hopea , Parashorea , Shorea ). It usually attacks freshly cut logs ( Browne 1961a).

Figures

PLATE 1. FIGURE 1. Genyocerus biporus (Schedl) dorsal view of male. FIGURE 2. Genyocerus biporus (Schedl) dorsal view of female. FIGURE 3. Genyocerus biporus (Schedl) frontal view of female head. FIGURE 4. Genyocerus biporus (Schedl) lateral view of male head.