A = Chain at two focal planes; B = Two living cells in valve view and girdle view (arrow=special band); C = Cleaned valve (DIC)
Life-form: Cells united in chains
Size: 8-55 µm
Resting spore:
Note: T. gravida and T. rotula may be the same species (Syvertsen 1977)
Distinctive features: Structure of valve face and band next to valvocopula
Similar species:
Distribution: Widely
Literature:
Hasle, G. R. & Syvertsen, E. E. 1996. Marine diatoms. In: Tomas,
C. R. (ed.) Identifying marine diatoms and dinoflagellates. Academic
Press, Inc., San Diego, p. 5-385.
Syvertsen, E. E. 1977. Thalassiosira rotula and T. gravida : Ecology and morphology. Beih. zur Nova Hedwigia. 54: 99-112.