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Authority

(Hasle) Hasle (1993: 319)

Class

Diatomophyceae

Order

Pennales

Family

Bacillariaceae

Synonyms

Nitzschia prolongata Manguin (1957: 132, pl. 7, fig. 46), auct. non Hustedt (1938: 489, pl. 41, fig. 28)

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Basionym

Nitzschia prolongatoides Hasle (1965a: 25, pl. 1, fig. 8; pl. 2, figs 11–13; pl. 12, figs 7, 8; pl. 13, figs 1, 2; text figs 1, 2)

Additional References

Hasle (1964: pl. 5, fig. 10), Hasle & Medlin (1990a: 170, pl. 22.3, figs 7, 8), Hasle & Syvertsen (1997: 317, pl. 73, tab. 75)

Description

Cells solitary or in stellate colonies, linear to rostrate in valve view, often with slightly inflated apices and expanded in middle area; apical axis 20–70 µm; transapical axis 0.5–2.5 µm. Transapical striae 30–35 in 10 µm. Interstrial membranes with 2 or 3 rows of minute poroids. Keel eccentric; fibulae 15–18 in 10 µm. Central nodule present. [See Hasle (1965a) for a full description.]

Distribution

Sea-ice near Davis Station, East Antarctica (Archer et al., 1996); Terre Adélie (Manguin, 1957); Antarctic (Hasle & Medlin, 1990a); Weddell-Scotia Confluence (Garrison et al., 1987).

Comments

Pseudonitzschia prolongatoides is similar in appearance to P. subcurvata, but in valve view the latter has one straight margin and one curved, whereas P. prolongatoides is inflated evenly in the centre of the cell.

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