Summary
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.
Zusammenfassung
Die Cyrtocyten und die proximalen Nephridialkanalabschnitte von Provortex psammophilus wurden elektronenmikroskopisch untersucht. Die Reusen, die nur jeweils einen Kranz von Stäben aufweisen, werden ausschließlich von den multiciliären Cyrtocyten gebildet, deren Kerne wahrscheinlich extrem basal in Zellfortsätzen liegen. Distal gehen die Cyrtocyten ohne Ausprägung einer Zellgrenze in die proximalen, cilienlosen Kanalabschnitte über, die sich nacheinander vereinigen; dabei bilden ihre Wandungen Syncytien. Während die Ultrafiltration auf die Reusen beschränkt ist, finden Resorptionsvorgänge nur in den proximalen Kanalabschnitten statt. Die Reusenbereiche der Protonephridien sind vollständig von einer unterschiedlich dicken Interzellularsubstanz umhüllt.
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Abbreviations
- b :
-
Basalkörper
- c :
-
Cyrtocyte
- ce :
-
Centriol
- cw :
-
Cilienwurzel
- i :
-
Interzellularsubstanz
- k :
-
proximaler Nephridialkanal
- kl :
-
Kanallumen
- m :
-
Muskulatur des Hautmuskelschlauches
- p :
-
Parenchymzelle
- rl :
-
Reusenlumen
- rs :
-
Reusenstab
- v :
-
Vakuole
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Brüggemann, J. Zur Feinstruktur der Protonephridien von Provortex psammophilus (Plathelminthes, Rhabdocoela). Zoomorphology 107, 96–102 (1987). https://doi.org/10.1007/BF00312119
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DOI: https://doi.org/10.1007/BF00312119