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Costal strip accumulation and lorica assembly in the marine choanoflagellate diplotheca costata valkanov



Costal strip accumulation and lorica assembly in the marine choanoflagellate diplotheca costata valkanov



Journal of Protozoology 38(1): 97-104



The lorica of the tectiform choanoflagellate D. costata contains five categories of costal strips distinguishable from each other on the basis of morphology and patterning. Categories of strips including those forming the anterior transverse costa; the anterior, intermediate, and posterior costal strips, respectively, of the longitudinal costae and those constituting the posterior transverse costa. The distinctive morphology of each class of strips makes it possible to observe their location and orientation within the overall accumulation of strips at the top of the parent cell collar. In Diplotheca costata the orientation and positioning of the different categories of strips in an accumulation anticipates their orientation and imbrication in the mature lorica. Assembly of the lorica from an accumulation of strips involves lateral sliding of costal strips to constitute transverse costae and longitudinal sliding of strips to constitute longitudinal costae. The motive force for lorica assembly is provided by extension of the anterolateral tentacles.

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Accession: 007165617

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DOI: 10.1111/j.1550-7408.1991.tb04809.x


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