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Authority

G.Karst. (Karsten, 1905: 81, pl. 6, fig. 3)

Class

Diatomophyceae

Order

Centrales

Family

Coscinodiscaceae

Synonyms

N/A

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Basionym

N/A

Additional References

van Heurck (1909: 49, pl. 12, fig. 167), Hustedt (1958: 116, figs 32, 33), Kopczyńska & Ligowski (1985), Priddle & Fryxell (1985: 136, figs A, B), Moisan & Fryxell (1993: 493)

Description

Cells solitary, discoid. Valves circular, strongly convex, sometimes flattened towards the centre, 87–230 µm diameter. Central rosette of areolae absent. Areolae hexagonal with a small central puncta, uniform in size on valve surface, 3–5 in 10 µm. Marginal labiate processes small, 1 in 10 µm, in a marginal ring (Fig.c); one (?or 2) larger marginal process present (Fig. d). Chloroplasts small, spherical or discoid.

Distribution

Coastal waters near Davis Station, East Antarctica; widespread throughout the Southern Ocean (Hendey, 1937); Prydz Bay, East Antarctica (Ligowski, 1983); Ross Sea (Watanabe, 1982); Bellingshausen Sea, 69°21’S 81°08’W, “Belgica ” (van Heurck, 1909).

Comments

Hendey (1964) noted a resemblance to C. oculus-iridis. However, the latter has a conspicuous, central rosette of c. 5 areolae.

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