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Authority

Hasle & Heimdal (1970: 573–575, figs 55–64, 71, 72)

Class

Diatomophyceae

Order

Centrales

Family

Thalassiosiraceae

Synonyms

N/A

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Basionym

N/A

Additional References

Makarova (1978: 224, figs 6–12), Rivera (1981: 113–116, figs 317–339), Johansen & Fryxell (1985: 175, fig. 11), Fryxell & Johansen (1990: 99, pl. 11.8, fig. 7)

Description

[after Johansen & Fryxell (1985)] Cells discoid. Valves circular, 21–30 µm diameter (17–40.5 µm fide Rivera, 1981), rounded towards the margins. Areolation fasciculate; areolae 10–15 in 10 µm. Marginal strutted processes in a single ring, 4–6 in 10 µm. Central strutted processes 1–8, scattered in central area, each with an internal extension with tricolumnar supports, lacking an external extension. Labiate process solitary, midway between the valve centre and margin.

Distribution

Antarctic and sub-Antarctic (Fryxell & Johansen, 1990); Antarctic, and coastal waters of Chile and Peru (Johansen & Fryxell, 1985); Atlantic Ocean, 19°51.1’S 12°37’E, off Africa (Makarova, 1978).

Comments

We have not seen this species.

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