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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.

Accession: 006027191

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Related references

Bruggemann, J., 1987: Zur Feinstructur der Protonephridien von Provortex psammophilus (Platyhelminthes, Rhabdocoela). Zoomorphology (Berlin): 1072: 96-102

Sopott-Ehlers, Beate., 1995: Some data on the ultrastructure of the eyes and spermatozoa in Provortex psammophilus (Plathelminthes, Rhabdocoela, Dalyellioida). Microfauna Marina, 10: 307-312

Sopott-Ehlers, B.; Ehlers, U., 1995: Modified sperm ultrastructure and some data on spermiogenesis in Provortex tubiferus (Platyhelminthes, Rhabdocoela): Phylogenetic implications for the Dalyellioida. Spermatozoa of Provortex tubiferus are thread-shaped, totally enclosed by peripheral microtubles and devoid of cilia or flagella. A peripheral layer of dense bodies underlies the cortical microtubules. Roundish mitochondria are arranged in a singl...

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Bedini, C.; Lanfranchi, A., 1990: The eyes of mesostoma ehrenbergi focke 1836 platyhelminthes rhabdocoela fine structure and photoreceptor membrane turnover. Each pigment-cup eye of Mesostoma ehrenbergi consists of two photoreceptor cells, the anterior cell being bilobate, the posterior almost linear, and of a multicellular pigment cup. The nuclei of the photoreceptor cells are located inside the media...

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Sopott-Ehlers, Beate., 1995: Electronmicroscopical studies on the photoreceptors of Provortex tubiferus (Plathelminthes, Rhabdocoela). Microfauna Marina, 10: 79-88

Brueggemann J., 1988: Structure and formation of the stylets of haloplanella longatuba and vejdovskya pellucida platyhelminthes rhabdocoela. The penial stylets of Haloplanella longatuba and Vejdovskya pellucida are formed intracellularly and in a successive mode starting from the distal end. However, there ae obvious differences in the mode of formation. In H. longatuba, a double-walle...

Rohde K.; Watson N.; Cannon L.R.G., 1987: Ultrastructure of the protonephridia of mesostoma sp rhabdocoela typhloplanoida. The ultrastructure of flame cells, protonephridial capillaries and lateral (non-terminal) flames of the rhabdocoel Mesostoma sp. from eastern Australia is described. The flame cells have variable numbers of loosely bundled cilia with cross-striate...

Warner, F.D., 1969: The fine structure of the protonephridia in the rotifer Asplanchna. Journal of Ultrastructure Research 29(5): 499-524