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Authority

(Grunow) Paddock (1988: 81, pl. 29)

Class

Diatomophyceae

Order

Pennales

Family

Naviculaceae

Synonyms

Tropidoneis antarctica (Grunow) Cleve (1894: 24)
See Paddock (1990: 153) for additional synonyms.

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Basionym

Navicula challengeri Grunow, in Cleve & Grunow (1880: 64)

Additional References

Hendey (1937: 350), Paddock (1990: 153, pl. 19.1, fig. 11), Hasle & Syvertsen (1997: 287, pl. 64)

Description

Cells usually united in ribbons; apical axis 85–270 µm; pervalvar axis 33 µm (in cell with apical axis 100 µm). Valve outline in girdle view smooth, lenticular. Raphe on the raised valve surface; raphe fins located c. one-eighth of the apical axis from the valve end. Transapical striae barely visible by LM, 18–24 in 10 µm; central striae thickened, varying in number and development. Helictoglossae enlarged.

Distribution

Coastal waters off Davis Station, East Antarctica; Antarctic Ocean (Paddock, 1990); Weddell-Scotia Confluence (Garrison et al., 1987, as T. antarcticas [sic]).

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