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Authority

Ehrenb. (Ehrenberg, 1844a: 77)

Class

Diatomophyceae

Order

Centrales

Family

Coscinodiscaceae

Synonyms

Coscinodiscus radiatus var. asteromphalus (Ehrenb.) Ehrenb. (Ehrenberg, 1854: pl. 18, fig. 45)
Coscinodiscus asteromphalus var. conspicua Grunow, in van Heurck (1883: 130–131, figs 2–5)
Coscinodiscus asteromphalus var. genuina Grunow (1884: 78), nom. inval.
Coscinodiscus oculus-iridis auct. non Ehrenberg (1854), sensu Grunow (1898), in Schmidt et al. (1874–1959: pl. 63, fig. 5)

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Basionym

N/A

Additional References

Hustedt (1927–30: 452, fig. 250), Hendey (1937: 243), Fryxell & Hasle (1973: 79, figs 38, 39), Ferreyra & Ferrario (1983b: 1, pl. 1–4), Priddle & Fryxell (1985: 128, figs A, B), Hasle & Lange (1992: 42, figs 1–14), Hasle & Syvertsen (1997: 104, pl. 15)

Description

Cells solitary, discoid; pervalvar axis 20–35 µm. Valves 80–400 µm diameter, slightly convex, with a small central depression; mantles gently sloping. Central rosette of areolae present; areolae arranged in radial striae, polygonal, with cribra, 3–5 in 10 µm in the centre, 6 in 10 µm at the margin. Central labiate processes absent; row of marginal labiate processes 1–3 in 10 µm; 2 large curved labiate processes nearer margin; second row of labiate processes on mantle. Chloroplasts large, numerous, plate-like.

Distribution

Coastal waters off Davis Station, East Antarctica; Terre Adélie (Manguin, 1960); Loubet Coast, Antarctic Peninsula (Ferreyra & Ferrario, 1983b); South Atlantic, Antarctic sector, near 66°32’S 0°14’W (Hustedt, 1958); South Orkney Is. (Ferreyra & Ferrario, 1983b); coastal waters off Syowa Station, East Antarctica (Ishikawa et al., 2001).

Comments

N/A

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