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Authority

(Ramsfjell) Hasle (1972b: 544)

Class

Diatomophyceae

Order

Centrales

Family

Thalassiosiraceae

Synonyms

N/A

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Basionym

Coscinosira poroseriata Ramsfjell (1959: 175, pl. 1, fig. g; pl. 2, fig. a)

Additional References

Hasle & Heimdal (1970: 574, figs 65–69), Rivera (1981: 117–120), Johansen & Fryxell (1985: 175, figs 10, 51, 52), Fryxell & Johansen (1990: 99, pl. 11.8, fig. 6), Hasle & Syvertsen (1997: 87, pl. 12)

Description

Cells chain-forming, lightly silicified, discoid in girdle view; pervalvar axis often longer than cell diameter. Valves flat, circular, 14–38 µm diameter, gently rounded towards the margins. Areolation radial or fasciculate; areolae 11–16 in 10 µm; areolation finer on valve mantle (Fig. b). Marginal strutted processes in a single ring, 1 or 2 in 10 µm. Central strutted processes 1–8, occurring in 1 or 2 straight or zig-zag lines, a central areola or annulus at the end of the line (Fig. d, e); strutted processes with internal tube extensions and tricolumnar supports. Labiate process solitary, not marginal, almost in line with central strutted processes, internally slit-like (Fig. e, f).

Distribution

Prydz Bay and Southern Ocean, south of Australia; cosmopolitan (Hasle & Syvertsen, 1997); all sectors of the Antarctic (Johansen & Fryxell, 1985); sub-Arctic to temperate northern waters (Fryxell & Johansen, 1990).

Comments

N/A

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