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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

(O’Meara) Hust. (Hustedt, 1952: 294)

Class

Diatomophyceae

Order

Pennales

Family

Bacillariaceae

Synonyms

Fragilaria antarctica Castrac. (Castracane, 1886: 56, pl. 25, fig. 12)
Trachysphenia australis var. kerguelensis (O’Meara) De Toni (1892: 645)
Fragilariopsis antarctica (Castrac.) Hust., in Schmidt (1913: pl. 299, figs 9–14)
Nitzschia kerguelensis (O’Meara) Hasle (1965b: 14, pl. 3, figs 4, 5; pl. 4, figs 11–18; pl. 5, figs 1–11; pl. 6, figs 2–4; pl. 7, fig. 9; pl. 8, fig. 10; pl. 16, figs 3–5), Hasle (1972a: 115), Hasle & Medlin (1990c: 181, pl. 24.2, figs 11–18; pl. 24.3, fig. 9), Moisan & Fryxell (1993: 493)
See Hasle (1965b) for full synonymy, LM and EM descriptions, discussion of nomenclatural problems and distribution.

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Basionym

Terebraria kerguelensis O’Meara (1877: 56, pl. 1, fig. 4)

Additional References

Hustedt (1958: 162, figs 121–127), Hasle & Syvertsen (1997: 296, pl. 66)

Description

Cells solitary or forming ribbon-shaped colonies attached by the valve surfaces, in girdle view valve face slightly curved towards ends, in valve view cells elliptical; apical axis 10–76 µm; transapical axis 5–11 µm. Transapical striae comparatively coarse, 4–7 in 10 µm, straight, those near the valve poles slightly curved. Interstrial membranes punctate, with 2 rows of alternating areolae, 8–10 in 10 µm.

Distribution

Southern Ocean, 57°35’S 105°46’E, offshore Wilkes Land; sea-ice near Davis Station (Archer et al., 1996b); type locality, surface of the water between Kerguelen and Heard Islands (O’Meara, 1877); KERFIX, 50°40’S 68°25’E, Southern Ocean (Kopczyńska et al., 1998); circumpolar Antarctic distribution (Baker, 1954); Weddell-Scotia Confluence (Garrison et al., 1987).

Comments

This species has been described as “the most abundant diatom in Antarctic Seas” (Hart, 1942).

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