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The lizard beetle Doubledaya bucculenta (Coleoptera: Erotylidae: Languriinae) female has evident asymmetric head morphology. The females excavate small holes in host bamboo internodes for the deposition of eggs. To understand the asymmetry and allometry of male and female adults and larvae of D. bucculenta, mandibular length, genal and head width, and elytral length were measured, and the oviposition preference for different-sized internodes of the bamboo Pleioblastus simonii and the relationship between internode size and emerging adult size were examined. Larval mandibles exhibited no clear asymmetry pattern, and genae showed fluctuating asymmetry in length. Adult male mandibles showed left-directional asymmetry, but genae showed fluctuating asymmetry. Adult female mandibles and genae exhibited marked left-directional asymmetry. The degree of asymmetry of mandibles and genae remained constant regardless of body size. Large females tended to choose large-diameter internodes of P. simonii and to lay eggs successfully, whereas small females tended to choose intermediate-diameter internodes, but to fail in oviposition, suggesting that small females pay a high cost on oviposition. There was a positive correlation between internode size and emerging adult size. Marked directional asymmetry of female mandibles and genae are discussed in relation to greater frequency of cutting bamboo fibers compared with adult males, and the traits of bamboo internode.

zoological science

Exaggerated Asymmetric Head Morphology of Female<i>Doubledaya bucculenta</i>(Coleoptera: Erotylidae: Languriinae) and Ovipositional Preference for Bamboo lnternodes

Exaggerated Asymmetric Head Morphology of FemaleDoubledaya bucculenta(Coleoptera: Erotylidae: Languriinae) and Ovipositional Preference for Bamboo lnternodes