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Reproduction in Rhizosolenia Hebetata and its Linkage with Rhizosolenia Styliformis

  • D. D. Seaton (a1)

Extract

A net sample of phytoplankton taken in the outer Moray Firth in which there were many cells of R. hebetata forma semispina and several cells of R. hebetata forma hiemalis (Fig. 1 a, b) was also found to contain cells either with one forma semispina calyptra or one forma hiemalis calyptra, in which the cell wall changed abruptly at the opposite end to a thin weakly silicified, sometimes almost membranous structure, ending in a central, broadly conical apex with a delicate hollow spine (Fig. 2j, k). The perizonium like appearance of one end of these cells suggested that they might be a stage in the development of the auxospore in R. hebetata Bailey (sensu Gran).

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Gran, H. H., 1902. Das Plankton des Norwegischen Nordmeeres von biologischen und hydrographischen Gesichtspunkten behandelt. Rep. Norw. Fishery mar. Invest., Vol. 2, Pt. 2, No. 5, 217 pp.
Gran, H. H., 1904. Die Diatomeen der arktischen Meere. I. Teil: Die Diatomeen des Planktons—Fauna arct., Vol. 3.
Hendey, N. I., 1964. An Introductory Account of the Smaller Algae of British Coastal Waters. V. Bacillariophyceae (Diatoms). Fishery Invest., Lond., Ser. 4, 317 pp.+ 45 plates.
Hustedt, F., 1930. Bacillariophyta. Die Süsswasser-Flora Mitteleuropas (ed. Pascher, ), Vol. 10.
Ramsfjell, E., 1959. Dimorphism and the simultaneous occurrence of Auxospores and Microspores in the Diatom Rhizosolenia hebetata forma semispina (Hensen) Gran. Nytt Mag. Bot. Vol. 7, pp. 169–73.
Wimpenny, R. S., 1946. The size of diatoms. II. Further observations on Rhizosolenia styliformis Brightwell. J. mar. biol. Ass. U.K., Vol. 26, pp. 271284.
Wimpenny, R. S., 1966. The Plankton of the Sea. London: Faber & Faber.

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