Summary
In living Ophryotrocha puerilis, Polyophthalmus pictus and Dinophilus gyrociliatus no modified cilia are present. Treatment with hyper- and hypotonic magnesium chloride solutions leads to the formation of either cilia with dilated tips or discocilia (paddle cilia). Discocilia show axoneme loops within distal swellings of the ciliary membranes. Both types of modified cilia regain their normal appearance if they are allowed to recover in seawater. The total number of discocilia and the diameter of the loops are inversely related to the osmolarity of the magnesium chloride solution used. Even isotonic solutions of magnesium chloride, which are usually used to anaesthetize marine worms, readily induce modified cilia. This indicates that the effect is not merely due to osmotic conditions. Glutaraldehyde and osmium tetroxide may act in the same way to induce modified cilia, a fact which may account for the numerous TEM and SEM documentations of modified cilia in various marine invertebrates. Which cilia in a particular species are modified varies from one specimen to another.
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References
Arnold JM, Williams-Arnold LD (1980) Development of the ciliature pattern on the embryo of the squid, Loligo pealei: A scanning electron microscope study. Biol Bull 159:102–116
Bergquist PR, Green CR, Sinclair ME, Roberts HS (1977) The morphology of cilia in sponge larvae. Tissue Cell 9:179–184
Dilly PN (1977) Material transport within specialised ciliary shafts on Rhabdopleura zooids. Cell Tissue Res 180:367–381
Ehlers U, Ehlers B (1978) Paddle cilia and discocilia — genuine structures? Cell Tissue Res 192:489–501
Heimler W (1978) Discocilia — a new type of kinocilia in the larvae of Lanice conchilega (Polychaeta, Terebellimorpha). Cell Tissue Res 187:271–280
Herrmann K (1979) Larvalentwicklung und Metamorphose von Phoronis psammophila (Phoronida, Tentaculata). Helgoländer wiss Meeresunters 32:550–581
Matera EM, Davis WJ (in prep) Electron microscopy of putative chemoreceptors in the gastropod mollusk Pleurobranchaea californica
Oldfield SC (1975) Surface fine structure of the globiferous pedicellariae of the regular echinoid, Psammechinus miliaris Gmelin. Cell Tissue Res 162:377–385
Pfannenstiel HD (1978) Endocrinology of polychaete reproduction and sexual development. Boll Zool 45:171–188
Reynolds ES (1963) The use of lead citrate at high pH as an electron-opaque stain in electron microscopy. J Cell Biol 17:208–212
Storch V, Alberti G (1978) Ultrastructural observations on the gills of polychaetes. Helgoländer wiss Meeresunters 31:169–179
Tamarin A, Lewis P, Askey J (1974) Specialized cilia of the byssus attachment plaque forming region in Mytilus californianus. J Morphol 142:321–327
Tamarin A, Lewis P, Askey J (1976) The structure and formation of the byssus attachment plaque in Mytilus. J Morphol 149:199–221
West DL (1978) Comparative ultrastructure of juvenile and adult nuchal organs of an annelid (Polychaeta: Opheliidae). Tissue Cell 10:243–257
Whittle AC, Zahid ZR (1974) Fine structure of nuchal organs in some errant polychaetous annelids. J Morphol 144:167–184
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This work was supported by FPS “Adaptive Dynamik in Struktur und Leistung tierischer Organe” FU Berlin
The author is very much indebted to Mrs. G. Schröer and to Mrs. Ch. Grünig for their skilful technical assistance and to Dr. P.M.J. Shelton for his help with the English manuscript
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Pfannenstiel, H.D. Modified axonemes and ciliary membranes in three polychaete species. Cell Tissue Res. 224, 181–188 (1982). https://doi.org/10.1007/BF00217277
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DOI: https://doi.org/10.1007/BF00217277