Abstract
The accessory reproductive glands of Leptinotarsa decemlineata males are simple epithelial tubular glands. They are surrounded by a network of slow acting muscle cells. All the gland cells have a very extensive granular endoplasmic reticulum, a prominent Golgi apparatus, but few secretory granules. The secretory product in the lumen, which is a neutral mucopolysaccharide-protein complex, appears as a granular material in which fibrillar structures occur. Neither in the gland cells nor in the lumen were regional differences observed. After allatectomy the gland cells degenerate in a remarkable way. A zone containing microvillous structures appears between the outer and inner cells. While the inner cells degenerate completely, the outer ones do not but become organised for minimal consumption of energy, necessary to survive diapause.
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