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Authority

(van Heurck) Heiden, in Heiden & Kolbe (1928: 554)

Class

Diatomohyceae

Order

Pennales

Family

Bacillariaceae

Synonyms

Fragilaria sublinearis f. longa van Heurck (1909: 35, pl. 3, fig. 41)
Nitzschia sublineata Hasle (1972a: 115), Hasle & Medlin (1990c: 181, pl. 24.3, fig. 1; pl. 24.5, figs 1–10; pl. 24.6, fig. 1)
Fragilaria sublinearis var. A, fide Bunt (1961: 32, pl. 8)
See Hasle (1965b) for full synonymy, LM and EM descriptions, distribution and discussion of nomenclatural problems.

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Basionym

Fragilaria sublinearis van Heurck (1909: 35, pl. 3, fig. 39)

Additional References

Jousé et al. (1962: 87, pl. 6, figs 10–16), Hasle (1965b: 27, pl. 7, fig. 1; pl. 11, figs 1–10; pl. 12, fig. 1; pl. 17, fig. 1), Moisan & Fryxell (1993: 493)

Description

Cells solitary, narrowly linear to lanceolate, with obtuse apices in valve view; apical axis 30–95 µm; transapical axis 5.5–8 µm. Transapical striae 7.5–9 in 10 µm, broad and straight, 1–3 striae near valve poles oblique or curved. Interstrial membrane perforations barely visible, comprising 2 rows of minute alternating poroids, 35–39 in 10 µm. Fibulae present in the same number as striae. Keel with puncta of irregular width. Pseudonodulus absent.

Distribution

Type locality, dark greenish brown sea-ice, 65°15.5’S, 64°30.0’W; Antarctica (Heiden & Kolbe, 1928); brownish undersurface of shelf-ice, 78°00’S 38°45’W, net samples from BRATEGG Station 49, near Peter I Island and Station 57 at the pack-ice (Hasle, 1965b); Lützow-Holm Bay (Tanimura et al., 1990); South Georgia (Hendey, 1937); coastal waters off Mawson Station, East Antarctica (Bunt, 1961); Indian Ocean sector of the Antarctic (Kopczyńska et al., 1986); Terre Adélie (Frenguelli, 1960).

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