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Authority

(Grunow) G.A.Fryxell & P.A.Sims, in Fryxell et al. (1986: 16, figs 14, 15, 30, 31)

Class

Diatomophyceae

Order

Centrales

Family

Hemidiscaceae

Synonyms

Coscinodiscus tabularis var. antarctica Manguin (1960: 251, pl. 24, figs 293–295)

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Basionym

Coscinodiscus tabularis Grunow (1884a: 86)

Additional References

Hustedt (1927–30: 427, fig. 230a), Manguin (1954: 19), Hustedt (1958: 119, figs 48–56), Priddle & Fryxell (1985: 124, figs A, B), Fryxell (1990: 112, pl. 14.1, fig. 4), Hasle & Syvertsen (1997: 126, pl. 20)

Description

Cells solitary, discoid; pervalvar axis c. 7 µm. Valves circular, flat; apical axis 16–70 µm. Areolae slightly fasciculate, in radial rows, 5–10 in 10 µm near the centre, c. 16 in 10 µm towards the margin. Labiate processes in a marginal ring, 7–12 in 10 µm, laterally expanded, with a reduced neck (Fig. b). Labiate process solitary, large, located on the edge of the central annulus. Pseudonodulus absent.

Distribution

Coastal waters near Davis Station, East Antarctica; type locality, Tafelkai, Zemlya Frantsa-Iosifa (Franz Josef Land), Arctic Ocean (Grunow, 1884); Prydz Bay, East Antarctica (Ligowski, 1983); Ross Sea (Watanabe, 1982); in Euphausia from Kerguelen sector of the Southern Ocean, in Salpa spp. from 68°49'S 0°40'W to 46°32'S 0°02'W, common around 51°S, in plankton in the South Atlantic, from 51°29'S 0°08'W to 46°32'S 0°02'W (Hustedt, 1958).

Comments

Fryxell et al. (1986) noted a wide range of morphological variation in this species.

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