Studies of physiologically active arthropod secretions. III. Chemical, morphological, and histological studies of the defence mechanism of Uroblaniulus canadensis (Say) (Diplopoda:Julida)

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Abstract
The defensive secretion of a millipede, Uroblaniulus canadensis (Say), is shown to consist of a mixture of benzoquinones and aliphatic compounds. Two of the benzoquinones are identified as p-benzoquinone and 2,3-dimethoxybenzoquinone. The gross structure of the gland producing the secretion is described and histological studies reveal the presence of secretory units. Each secretory unit consists of a pair of specialized cells and has a tubule to transport the secretion manufactured in these cells to a large cuticular-lined reservoir.

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