Department of Botany, The University, Bristol 8, U.K.
THE MORPHOLOGY AND FINE STRUCTURE OF CERATIUM HIRUNDINELLA (DINOPHYCEAE)1
Article first published online: 28 JUN 2008
Journal of Phycology
Volume 6, Issue 2, pages 137–149, June 1970
How to Cite
Dodge, J. D. and Crawford, R. M. (1970), THE MORPHOLOGY AND FINE STRUCTURE OF CERATIUM HIRUNDINELLA (DINOPHYCEAE). Journal of Phycology, 6: 137–149. doi: 10.1111/j.1529-8817.1970.tb02372.x
Received November 14, 1969; revised February 11, 1970.
We are grateful to the Science Research Council for supporting this work, and to S. Nield of the Freshwater biological Association, Dr. J. Ridley of the Metropolitan Water Board, Dr. G. Thomasi and Mrs. S. Perini of the Natural History Museum at Trento (Italy), and K. Spittlehouse of the Medway Water Hoard, who made it possible for us to obtain samples of live Ceratium from a variety of places. We also thank G. Lawes, N. Moore, and P. Randall for their assistance with scanning electron microscopy and photography.
- Issue published online: 28 JUN 2008
- Article first published online: 28 JUN 2008
Some aspects of thecal morphology in Ceratium hirundinella are redescribed by means of scanning electron microscopy. The internal anatomy of the cell has been clearly revealed for the first time in serial sections examined by transmission electron microscopy. An unusual sulcus, termed the sulcul aperture, has been found to open into a large ventral chamber which extends toward the center of the cell. The 2 flagella are inserted at one side of the ventral chamber. The ultrastructure of the flagellar canals and root systems arc described in detail. A microtubular strand has been found to run from near the nucleus to near the flagellar bases but not to conned with either. The fine structure of the theca, trichocysts, nucleus, and chloroplasts is basically similar to that of other dinoflagellates. Food vacuoles are reported. These contain material thought to be undergoing digestion. It is suggested that the food particles enter the cell by way of the ventral chamber, which is lined only by membranes, unlike the rest of the cell, which is covered by thick plates. The new findings are discussed in relation to the earlier work on the species and to the fine structure of oilier dinoflagellates.