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Authority

Manguin (1957: 116, pl. 2, fig. 13a, b)

Class

Diatomophyceae

Order

Centrales

Family

Hemidiscaceae

Synonyms

N/A

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Basionym

N/A

Additional References

Manguin (1960: 258, pl. 3, figs 45, 46; pl. 26, figs 308–310)

Description

Cells solitary, discoid. Valves convex in the centre and with rounded edges, 41–68 µm diameter. Areolae in c. 13–16 radial (not fasciculate) striae, 12–15 in 10 µm.

Distribution

Type locality, Terre Adélie, 66°50’S 141°25’E (Manguin, 1957).

Comments

Species of Actinocyclus have the following diagnostic features: radial, usually fasciculate areolation; a marginal ring of labiate processes, laterally expanded internally; a marginal pseudonodulus (sometimes difficult to distinguish); and radial, hyaline bands (see Villareal & Fryxell, 1983 and Watkins & Fryxell, 1986 for further details).

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