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Authority

Cleve (1873: 11, pl. 2, fig. 8)

Class

Diatomophyceae

Order

Centrales

Family

Chaetoceraceae

Synonyms

Chaetoceros dispar Castrac. (Castracane, 1886: 76, pl. 8, fig. 6)
Chaetoceros polygonum Schütt (1895: 46, pl. 5, fig. 24)
Chaetoceros audax Schütt (1895: 47, pl. 5, fig. 25)
See VanLandingham (1968: 701) for full synonymy.

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Basionym

N/A

Additional References

Karsten (1905: 115, pl. 15, fig. 9), Hustedt (1926: 641, figs 363, 364), Hendey (1937: 290), Manguin (1954: 15), Hustedt (1958: 135), Evensen & Hasle (1975: 157, figs 6–11), Moisan & Fryxell (1993: 493), Hasle & Syvertsen (1997: 196, pl. 39a)

Description

Cells united to form stiff straight chains, rectangular in girdle view; pervalvar axis 12–40 µm; girdle distinctly visible. Valves oblong-elliptical; apical axis 10–46 µm; surface flat, margins curved, with a small central spine. Apertures large, although varying in size, somewhat rectangular. Setae strong, to 200 µm long, arising from the valve surface slightly within the margin, usually stiff and straight, but sometimes slightly inflated and markedly sigmoidal with apices bent inwards (Fig. b, c); setae bearing lines of fine punctae and small spines. Chloroplasts numerous, small, spherical, distributed into the setae.

Distribution

South Atlantic, 61°32’S 0°00’ to 51°29’S 0°08’W (Hustedt, 1958); Southern Ocean (Hendey, 1937; Priddle & Fryxell, 1985); north polar and temperate waters (Hendey, 1937); Ross Sea (Andreoli et al., 1995); Weddell-Scotia Sea (Garrison et al., 1987); KERFIX, 50°40’S 68°25’E, Southern Ocean (Kopczyńska et al., 1998).

Comments

The long setae of Chaetoceros atlanticus distinguish it from C. bulbosus, the setae of which are markedly inflated and much shorter (c. 20 µm).

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