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J Exp Zool. 1994 Jan 1;268(1):9-16.

Serial repetition of cilia pairs along the tail surface of an ascidian larva.

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Department of Biology, University of New Brunswick, Fredericton, Canada.


Regularly spaced cilia pairs were found in two rows immediately opposite to each other mid-dorsally and mid-ventrally along the larval tail surface of the ascidian protochordate Ciona intestinalis. There were approximately ten such equidistantly placed dorsal-ventral sets embedded in the matrix of the extracellular larval test which forms the flattened vertical tail fin. These immotile cilia originate from pairs of cell bodies in mid-dorsal and mid-ventral peripheral nerves running beneath the tail epidermis. The cilia and neural cell bodies were visualized by immunocytochemical staining with anti-tubulin antibodies; their nature was confirmed by ultrastructural examination. This pattern of cilia and neural cell body placement is conceivably related to the segmentation found in vertebrates.

[Indexed for MEDLINE]

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