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Authority

O.Zacharias (1905: 120, text fig.)

Class

Diatomophyceae

Order

Centrales

Family

Rhizosoleniaceae

Synonyms

Rhizosolenia curva G.Karst. (Karsten, 1905: 97, pl. 11, fig. 2)

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Basionym

N/A

Additional References

Hendey (1937: 314), Hustedt (1958: 133), Manguin (1960: 268, pl. 5, figs 64–66), Priddle & Fryxell (1985: 82, figs A–F), Priddle et al. (1990: 118, pl. 15.2, fig. 3), Hasle & Syvertsen (1997: 147, pl. 26, tab. 32), Armand & Zielinski (2001: pl. 3A, figs 1–3)

Description

Cells solitary or paired, long, cylindrical, distinctly curved; pervalvar axis 10–95 µm long (or longer fide Manguin, 1960). Valves conical, bilaterally symmetrical; apical axis 20–135 µm. Process long, uniformly tapering (often broken during the preparation of material for microscopy). Otaria small, rounded, arising on the distal part of the valve (rather than the process). Contiguous area with distinct marginal ridges. Claspers small. Intercalary girdle bands arranged in 2 dorsiventral columns; bands 20 in 10 µm, finely areolate.

Distribution

Terre Adélie (Manguin, 1960); South Georgia and Drake Passage (Hendey, 1937); sub-Antarctic/Polar Front (Hasle & Syvertsen, 1997); Southern Ocean (Hart, 1937).

Comments

Armand & Zielinski (2001) summarised the distribution of R. curvata as sub-Antarctic, limited southward by the position of the Polar Front.

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