The genus Thalassiosira Cleve belongs to the order
Thalassiosirales whose members are distinguished from
other centric diatoms by the presence of strutted processes
(fultoportulae), which are the tubes through which
chitan threads are extruded to facilitate colony formation
(Ross & Sims, 1972). It is one of the largest centric diatom
genera with approximately 100 species described to date
(Syvertsen, 1984; Round et al., 1990). Thalassiosira species
can be differentiated by the shape, position, and numbers
of strutted and labiate processes on the valve, the number
of areolae in 10 #m on the valve face and mantle, and the
cingulum morphology (Hasle, 1973; Makarova, 1980).
Colony configuration and the form of the cells also
provide characters for species identification under the
light microscope.
The genus Thalassiosira Cleve belongs to the orderThalassiosirales whose members are distinguished fromother centric diatoms by the presence of strutted processes(fultoportulae), which are the tubes through whichchitan threads are extruded to facilitate colony formation(Ross & Sims, 1972). It is one of the largest centric diatomgenera with approximately 100 species described to date(Syvertsen, 1984; Round et al., 1990). Thalassiosira speciescan be differentiated by the shape, position, and numbersof strutted and labiate processes on the valve, the numberof areolae in 10 #m on the valve face and mantle, and thecingulum morphology (Hasle, 1973; Makarova, 1980).Colony configuration and the form of the cells alsoprovide characters for species identification under thelight microscope.
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