Morphology and Histology of the Sex Pheromone Gland of a Geometrid, Rheumaptera hastata1

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Abstract
A new type of sex pheromone gland has been found in females of a birch defoliator, Rheumaptera hastata. The gland consists of a pair of internal tubular organs composed of glandular epithelial cells. These paired glands are located dorsal to the rectum and oviduct and extend from their common opening in the 9th abdominal segment anteriorly into the 7th abdominal segment. Bioassay with male moths confirmed that the paired glands produce the sex pheromone.

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