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

Zoomorphology (Berlin) 107(2): 96-102
On the fine structure of the protonephridia of provortex psammophilus platyhelminthes rhabdocoela
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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