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Ocean Ecosystems/ESRIG, University of Groningen and Arctic Centre, University of Groningen and the RaTS program, British Antarctic Survey.

Authority

(van Heurck) Heiden, in Heiden & Kolbe (1928: 555)

Class

Diatomophyceae

Order

Pennales

Family

Bacillariaceae

Synonyms

Fragilaria antarctica van Heurck (1909: 25, pl. 3, fig. 38)
Fragilaria obliquecostata f. maxima van Heurck (1909: 25, pl. 3, fig. 40)
Fragilaria antarctica f. lata van Heurck (1909: 25, pl. 3, fig. 4)
Fragilaria sublinearis van Heurck (1909: 25, pl. 3, fig. 37)
Fragilariopsis sublinearis (van Heurck) Heiden & Kolbe, in Frenguelli (1943: 241, pl. 1, figs 12?, 13–15)
Nitzschia obliquecostata (van Heurck) Hasle (see Hasle & Medlin, 1990c: 182, pl. 24.3, figs 2–7)
See Hasle (1965b) for full synonymy, LM and EM descriptions and discussion of nomenclatural problems.

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Basionym

Fragilaria obliquecostata van Heurck (1909: 25, pl. 3, fig. 38)

Additional References

Hustedt (1958: 163, pl. 12, figs 149–151), Manguin (1960: 299, pl. 13, figs 136, 137; pl. 29, fig. 354), Fukushima (1962, pl. 2, figs 12, 13), Jousé et al. (1962: 86, pl. 3, fig. 9), Hasle (1965b: 18, pl. 7, figs 2–7), Hargraves (1968: 60, figs 103, 104)

Description

Cells solitary, linear to lanceolate in valve view; apical axis 57–110 µm; transapical axis 8–10 µm. Transapical striae 6.5–8 in 10 µm, usually straight, but sometimes curved or oblique near the poles. Interstrial membranes punctate, with 2 or 3 rows of areolae; areolae 16–23 in 10 µm. Canal raphe markedly eccentric. Fibulae 6.5–8 in 10 µm. Central nodule absent.

Distribution

Southern Ocean and Antarctic coastal waters near Davis Station, East Antarctica; type locality, dark greenish brown sea-ice, 65°15.5’S 64°30.0’W (van Heurck, 1909); Weddell-Scotia Confluence (Garrison et al., 1987).

Comments

Specimens from coastal East Antarctica seen by us have slightly less dense areolae (16–20 in 10 µm). Heiden & Kolbe (1928) reported 20, and Manguin (1960) 23 areolae (poroids) in 10 µm (Hasle, 1965b).

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