Ultrastructure and Attachment of the Basal Disk of Haliclystus
The basal disk is the most proximal part of Haliclystus, which attaches to the substrate. Clark (1878) reported the basal disk as having ‘ollectocysts’ (structures similar to suckers) but Migot (1922a) rejected that idea, and he suggested that secretory material was responsible for the attachment. The ultrastructure of the basal disk of Hydra was studied by Philpott et al. (1966), Davis (1973) and Davis and Bursztajn (1973) and that of the scyphistoma of Aurelia by Chapman (1968, 1969), but there is only a brief account of the fine structure of the basal disk of Haliclystus (Westfall, 1968). The present study of the basal disk of Haliclystus adds some new information which might help us to understand its attachment.
KeywordsSupporting Cell Secretory Vesicle Dense Core Vesicle Axonal Membrane Secretory Material
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