Charlene W Sayers

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Protuberances on the cocoon surface of the leech, Theromyzon tessulatum, are roughly parallel rows of triangular prisms arranged equidistantly to each other on the outer surface of the cocoon membrane. The distance between neighboring protuberances is approximately 1.6 microm, the height approximately 0.5 microm and the semi-width approximately 0.3 microm.(More)
Clitellate annelids (e.g., segmented earthworms, leeches) secrete proteinaceous cocoons into which eggs are deposited. The process of cocoon production is characterized by the coordinated release of micro-granules from secretory cells positioned asymmetrically within the clitellum. Collectively, these assemble into a tubular cocoon sheath that is sealed at(More)
One distinguishing feature of clitellate annelids is the presence of specialized segments comprising the clitellum, whose primary function is to secrete a cocoon. Using histological analyses, we have documented cell types (I-V) and cellular processes associated with cocoon secretion in the aquatic leech, Theromyzon tessulatum. Our data indicate that the(More)
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