Morphology of adult and immature stages, and host plant use of Doubledaya sinuata (Coleoptera: Erotylidae: Languriinae)

Abstract: Morphology of larvae, pupae, adult female and male genitalia of Doubledaya sinuata Zia, 1934 (Coleoptera: Erotylidae: Languriinae) are described. The adults were found to be sexually dimorphic in external morphology, particularly in the shape of the head and mandibles: females have a large asymmetric head and mandibles; males have a symmetrical head with slightly asymmetric mandibles. Adult females of D. sinuata excavate holes with their mandibles on intermediate-sized internodes of recently dead culms of the bamboo Sinobambusa sat (Balansa) C. S. Chao & Renvoize, in order to deposit eggs on their inner surface. Larvae of D. sinuata consume tissues of the bamboo and complete the development within the internode. Significance of the asymmetric head and mandibular morphologies, oviposition preference and feeding habits of D. sinuata are discussed.

Key words: Coleoptera, Erotylidae, Languriinae, Languriini, lizard beetle, larva, pupa, immature stages, morphology, host plant, Sinobambusa sat, bamboo, sexual dimorphism, asymmetry, Vietnam, Oriental Region