THE GENUS THALASSIOSIRA (BACILLARIOPHYCEAE): MORPHOLOGY OF HETEROVALVATE RESTING SPORES OF T. SCOTIA

Resting spores of Thalassiosira scotia Fryx. et Hoban were abundant in phytoplankton net hauls collected from the Scotia Sea south of South Georgia in December 1981. Primary valves are distinguished from secondary valves by the presence of marginal striae with rounded, shoelike protrusions, villi su...

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Bibliographic Details
Published in:American Journal of Botany
Main Authors: Johansen, Jeffrey R., Doucette, Gregory J., Fryxell, Greta A.
Other Authors: National Science Foundation
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 1985
Subjects:
Scotia Sea
Antarc*
Antarctica
Online Access:http://dx.doi.org/10.1002/j.1537-2197.1985.tb08460.x
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Description
Summary:Resting spores of Thalassiosira scotia Fryx. et Hoban were abundant in phytoplankton net hauls collected from the Scotia Sea south of South Georgia in December 1981. Primary valves are distinguished from secondary valves by the presence of marginal striae with rounded, shoelike protrusions, villi surrounding marginal areolae and marginal striae, greater numbers of central strutted processes, and differences in structure of occluded processes. Densities of marginal strutted processes also tend to differ, though ranges overlap. Thalassiosira scotia is most closely related to T. antarctica, differing from that taxon by having coarser areolation, heavier silicification, and more prominent occluded processes. Rudimentary valves of T. scotia differ from those of T. antarctica.

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