Abstract

A system of striated fibers has been discovered immediately beneath the apical pore of the dinoflagellatesHeterocapsa pygmeae andScrippsiella sweeneyae. The striated fibers radiate from a distinct fibrous ring lying beneath the apical pore plate. InScrippsiella, the fibrous ring is the outer edge of a fibrous apical disk that lies beneath the entire apical pore plate. The striated apical fibers radiate posteriorly and remain closely appressed to the sub-thecal membrane. The striated fibers terminate midway between the apical pore and the cingulum and are associated with sub-thecal microtubules inHeterocapsa.

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