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Authority

Ehrenb. (Ehrenberg, 1841: 148, pl. 3, fig. 1a–c)

Class

Diatomophyceae

Order

Centrales

Family

Coscinodiscaceae

Synonyms

N/A

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Basionym

N/A

Additional References

Watanabe (1982), Boden (1985), Hasle & Syvertsen (1997: 107, fig. 6d, e; pl. 18)

Description

Cells solitary, discoid. Valves flat, circular, 30–180 µm diameter. Areolation radial, sometimes indistinctly decussate; areolae 2–9 in 10 µm. Small labiate processes at the points of origin of incomplete striae. Hyaline lines absent. One marginal ring of processes, including 2 slightly larger processes c. 135° apart, these visible by LM as indentations of the valve margin. Smaller processes scarcely visible.

Distribution

Ross Sea (Watanabe, 1982); Prydz Bay, SIBEX (Boden, 1985); oceanic species with world-wide distribution in temperate seas (Hendey, 1937).

Comments

Coscinodiscus radiatus has only occasionally been reported from the Antarctic.

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