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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.

Authority

van Heurck (1909: 21, pl. 3, fig. 57)

Class

Diatomophyceae

Order

Pennales

Family

Bacillariaceae

Synonyms

Nitzschia acicularis var. interrupta Heiden & Kolbe (1928: 670)
Nitzschia lanceolata var. spicula Manguin (1960: 334, pl. 19, fig. 232)
Nitzschia lanceolata var. pygmaea f. australis Manguin (1960: 334, pl. 19, figs 230, 231)
Nitzschia acicularis f. angustior auct. non Müller (1905), sensu Helmcke & Krieger (1954: 17, pl. 190)

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Basionym

N/A

Additional References

Hustedt (1958: 172, pl. 13, figs 167, 168), Hasle (1964: 23, pl. 1, fig. 1; pl. 4, fig. 5; pl. 5, fig. 2; pl. 11, figs 14, 15; pl. 12, figs 9–13), Hasle & Medlin (1990b: 177, pl. 23.2, figs 1–5; pl. 23.3, figs 1, 2)

Description

Cells solitary; median part rhomboid to lanceolate in valve view, with rostrate ends; apical axis 15–112 µm; transapical axis 2.5–5 µm. Transapical striae straight, close-set, 51–55 in 10 µm. Interstrial membranes perforated by 1 row of small poroids, c. 60 in 10 µm. Fibulae 5–14 in 10 µm. Central nodule present. See Hasle (1964) for a more detailed description.

Distribution

Near Davis Station, East Antarctica and Cape Evans; Ross Sea; type locality, sea-ice, 65°15.5’S 64°30.0’W (van Heurck, 1909); Indian sector of the Antarctic (Kozlova, 1962); Terre Adélie (Frenguelli, 1960); Antarctic (Hasle & Medlin, 1990b); Weddell-Scotia Confluence (Garrison et al., 1987).

Comments

The most common habitat of N. lecointei appears to be the undersurface of ice (tychopelagic). When liberated from this substratum, it will vegetate as a plankton form near the ice-edge.

In the Pacific part of the Antarctic Ocean, N. lecointei is confined to the zone nearest the ice and was recorded sporadically from water samples. Originally, it was sampled “par la fusion de glace de mer, coloré en vert-brun foncé” (van Heurck, 1909). Heiden & Kolbe (1928) reported N. acicularis var. interrupta from ice as well as in quantitative samples. Manguin (1960) reported the smaller N. lanceolata var. pygmaea f. australis as being common in bottom mud (“boue de profondeur”) at Cape Margérie, and the larger var. spicula as very rare in the same habitat. Frenguelli (1960) noted the species as rare in three samples from Terre Adélie, while Kozlova (1962) documented small amounts in water samples from stations close to Antarctica in the Indian Ocean sector.

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