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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

(Heiden) Paddock (1988: 63, pl. 24)

Class

Diatomophyceae

Order

Pennales

Family

Plagiotropidaceae

Synonyms

N/A

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Basionym

Tropidoneis gaussii Heiden, in Heiden & Kolbe (1928: 656, pl. 5, fig. 102)

Additional References

Paddock (1990: 152, pl. 19.1, figs 5, 6), Hasle & Syvertsen (1997: 289, pl. 65, tab. 72)

Description

Cells solitary or uniting into ribbons, often lying in girdle view. Valves delicate, with a low gently curved ridge, resulting in the cell appearing bilobed in girdle view; apical axis 102–159 µm; pervalvar axis 20–35 µm. Transapical striae 15–18 in 10 µm. Raphe fins absent (cf. Manguinea and Banquisea). Helictoglossae enlarged. Chloroplast 1, multi-lobed, lying in the centre of the cell.

Distribution

Coastal waters off Davis Station, East Antarctica; Antarctic, with ice (Paddock, 1990); Lützow-Holm Bay (Tanimura et al., 1990); Weddell-Scotia Confluence (Garrison et al., 1987, as Tropidoneis gaussii); in pack-ice, “Gaussberg”, Davis Sea (Heiden & Kolbe, 1928, as Tropidoneis gaussii).

Comments

Several other species of Plagiotropus, Membraneis and Tropidoneis have been reported from polar waters (for a fuller discussion and illustrations, see Paddock, 1988). Plagiotropus australis (Perag.) Paddock is a rare species, reported from Bransfield Strait (Paddock, 1988, 1990). Paddock stressed the need for further investigation of the “Tropidoneis ” group of the Naviculaceae.

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