Comparative Histology and Histochemistry of the Male Genital Accessory Glands of Dermacentor variabilis (Say and Argas radiatus (Railliet)

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Murphy, Richard W.
ETD; Male genital accessory gland; Dermacentor variabilis; Argas radiatus; Secretions; Histology; Histochemistry; Biochemistry, Biophysics, and Structural Biology; Biology; Legacy ETDs
thesis / dissertation description
Male genital accessory gland development in Dermacentor variabilis is completed by the fourth day after initiation of feeding, while that in Argas radiatus (Argasidae) occurs between the first and tenth days after adult ecdysis. D. variabilis has twelve spongy and/or granular lobes, and A. radiatus has fourteen spongy and/or granular lobes. The glands lack cellular differentiation in immatures, but have four distinct cell types present in adults. Both species also possess apocrine, holocrine, and merocrine secretory mechanisms. Secretions contain acid polysaccharides, mucin, glycogen, basic protein, and other products. Continually produced accessory gland secretions accumulate before mating and are discharged at the time of mating. Additional secretory material is produced soon after mating. A new tubular cell type is described.