• Animal Systematics, Evolution and Diversity
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• v.20 no.2
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• pp.225-230
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• 2004

The egg, larva, and pupa of Paracycnotrachelus longiceps (Motschulsky) are described and illustrated. The species is a well-known forest pest and lives on such host plants as Quercus acutissima, Q. aliena, Q. mongolica, and Q. serrata. Taxonomic notes and cradle structure are also provided.

• Korean Journal of Environmental Biology
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• v.37 no.3
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• pp.343-350
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• 2019

Cyllorhynchites ursulus drills holes in acorn and cuts branches with mandibles. To understand this special behavior, we observed the mouthpart of this species using several microscope methods. The stereoscopic microscope used in this study shows that the adductor tendon is thicker than the abductor tendon which confirms that mandibles exert more force pulling inwards than pushing outwards. Also, the shape and position differences were observed using an optical microscope. We found differences of the shape, position, and movement of mandibles among C. ursulus, Curculio sikkimensis and Paracycnotrachelus longiceps by way of observation using SEM. The width of the adductor tendon and the abductor tendon of males of the C. ursulus species was 32.87 ㎛, and 53.83 ㎛, respectively. And, the width of females was 40.81 ㎛ and 75.55 ㎛, respectively. Based on a variety of observations and analyses, we found that the unusual behavior of C. ursulus is deeply related to the morphological features, and these features could be applied to biomimicry.