Abstract

The tergal gland of the beetle, Drusilla canaliculata, contains defensive products which exhibit an extraordinary chemical diversity. This glandular exudate is fortified with alkanes, alkenes, saturated and unsaturated aliphatic aldehydes, 1,4-quinones, and hydroquinones. The aldehydes, n-dodecanal, n-tetradecanal, n-tetradec-5-enal, and n-tetradeca-5,8-dienal, constitute a major group of components. In addition, a new constituent in arthropod defensive secretions, 2-hydroxy-3-methylhydroquinone, has been identified as a minor component in this exocrine exudate.

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