Info

T. hyperborea

T. australis

PLATE 9 Thalassiosira anguste-lineata: (a) chain in girdle view; (b) valve, groups of subcentral processes in a modified ring. From Hasle & Syvertsen (1990a). Thalassiosira kushirensis: (a) chain in girdle view; (b) valve, single subcentral processes in a modified ring. From Hasle 8c Syvertsen (1990a). Thalassiosira australis: (a) two cells in girdle view, lower one with endogenous resting spore and rudimentary valves. Marginal processes evident; (b) valve with irregular groups of strutted processes in a modified ring. Thalassiosira hyperborea: (a) cell in girdle view with valve undulation; (b) valve with process pattern. From Hasle & Syvertsen (1990a). Scale bars = 10 fim.

TABLE 11 Morphometric Data of Tbalassiosira spp. with a Modified Ring of Subcentral Strutted Processes

Species

Diameter (jxm)

Valve areolae in 10 |im

Marginal proc. in 10 |im

T. anguste-lineata

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