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Authority

(Castrac.) Freng. (Frenguelli, 1943: 244, pl. 1, fig. 16)

Class

Diatomophyceae

Order

Pennales

Family

Bacillariaceae

Synonyms

Nitzschia lineata (Castrac.) Hasle (1972a: 115)
See Hasle (1965b) for full synonymy and description.

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Basionym

Fragilaria linearis Castrac. (Castracane, 1886: 56, pl. 19, fig. 9; pl. 25, fig. 11)

Additional References

Heiden & Kolbe (1928: 550, pl. 6, fig. 128), Hustedt (1958: 161, pl. 11, figs 137–139; pl. 12, fig. 152), Hasle (1965b: 37, pl. 12, fig. 17; pl. 15, figs 9–11), Hasle & Medlin (1990c: 181, pl. 24.6, fig. 17; pl. 24.7, figs 9–11)

Description

Cells solitary, linear in valve view, with obtusely rounded poles; apical axis 40–72 µm; transapical axis 7–9 µm. Transapical striae 7.5–9 in 10 µm, usually straight, but sometimes curved at the poles. Interstrial membranes punctate, with 2 rows of areolae c. 25 in 10 µm. Canal raphe markedly eccentric. Fibulae 7.5–9 in 10 µm. Central nodule absent.

Distribution

Coastal waters off Davis Station, East Antarctica; BRATEGG Stations 11, 43, 44, 47, 49, 54, 56 (Bellingshausen Sea–Amundsen Sea) (Hasle, 1965b); Weddell-Scotia Confluence (Garrison et al., 1987; Moisan & Fryxell, 1993).

Comments

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