Articles written in Proceedings – Animal Sciences
Volume 95 Issue 4 July 1986 pp 379-385
Final (3rd) instar larvae of the coconut rhinoceros beetle
Volume 99 Issue 6 November 1990 pp 447-455
The coconut rhinoceros beetle
Stridulatory mechanism comprises rubbing of a specialised region along the margin of the apex of the elytron —the pars stridens, against a series of striations —the plectrum, occupying the dorsum of the 7th abdominal tergite. Stridulation is possible with a single pars stridens, either of the left or right elytron, both being identical. No sexually dimorphic difference is apparent in the pars stridens. Plectral structure exhibits sexual dimorphism, being much prominent in the male.
Wing-locking is necessary to keep the elytra in the stridulatory position. Locking is effected by a longitudinal flange along the median side of one elytron (either the left or right, irrespective of the sex) fitting into a corresponding depression along the other. This differs from the reported cases in other coleopterans in which the flange of the left elytron extends under the right when locked.