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

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

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

Authority

(Hasle) G.A.Fryxell (1993: 319)

Class

Diatomophyceae

Order

Pennales

Family

Bacillariaceae

Synonyms

Nitzschia closteriodes Hasle (1956: 616) pro parte (see Hasle, 1964: 28)

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Basionym

Nitzschia subcurvata Hasle (1964: 28, pl. 1, fig. 3; pl. 12, figs 14–16; pl. 13, figs 1–6)

Additional References

Hasle (1974: 319), Hasle & Medlin (1990a: 177, pl. 23.2, figs 6–8), Fryxell et al. (1991: 243), Hasle & Syvertsen (1997: 323, pl. 73, tab. 75)

Description

Cells solitary or in chains, then with a short overlapping of valve ends, one margin straight in valve view, the other convex, thus inflated in middle part of valve; apical axis 47–113 µm; transapical axis 1.5–2.5 µm. Transapical striae fine, 44–49 in 10 µm, not visible by LM. Keel eccentric; fibulae irregularly spaced, 12–18 in 10 µm. Central nodule absent. [See Hasle (1964) for a full description.]

Distribution

Inshore waters off Davis Station, East Antarctica; Southern Ocean, offshore Wilhelm II Land at 60°50’S 93°36’E, and offshore Prydz Bay at 67°01’S 77°43’E; Antarctic (Hasle & Medlin, 1990a); Lützow-Holm Bay (Tanimura et al., 1990); Weddell-Scotia Confluence (Garrison et al., 1987).

Comments

Auxospore formation was described in detail and illustrated by Fryxell et al. (1991).

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