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On the fine structure of the protonephridia of provortex psammophilus platyhelminthes rhabdocoela



On the fine structure of the protonephridia of provortex psammophilus platyhelminthes rhabdocoela



Zoomorphology (Berlin) 107(2): 96-102



The cyrtocytes and the proximal parts of the nephridial canals of Provortex psammophilus have been investigated by electron microscope. The weir-baskets have, respectively, only one rim of rods, and they are formed exclusively by the multiciliary cyrtocytes, whose nuclei are situated probably extremely basally in cell projections. Lacking a distal cell border, the cyrtocytes pass over into the proximal aciliary parts of the canals which join successively, forming syncytia. While the ultrafiltration is restricted to the weir-baskets, resorption only takes place in the proximal parts of the canals. The weir areas of the protonephridia are completely surrounded by an intercellular matrix of variable thickness.

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Accession: 006027191

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