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Authority

Ehrenb. (Ehrenberg, 1844b: 200, fig. 3)

Class

Diatomophyceae

Order

Centrales

Family

Asterolampraceae

Synonyms

Asteromphalus buchii Ehrenb. (Ehrenberg, 1844b: 200, fig. 4)
Asteromphalus cuvieri Ehrenb. (Ehrenberg, 1844b: 200, fig. 7)
Asteromphalus humboldtii Ehrenb. (Ehrenberg, 1844b: 200, fig. 6)
For further synonyms see Van der Spoel et al. (1973: 529, figs 4, 5).

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Basionym

N/A

Additional References

Ehrenberg (1854: pl. 35A, fig. XXI, 2), Hustedt (1958: 127, figs 88–90), Kozlova (1962: pl. 9, fig. 6), Priddle & Fryxell (1985: 118), Moisan & Fryxell (1993: 493)

Description

Cells solitary, or sometimes in short chains of 2 or 3 cells, discoid. Valves slightly convex, 25–60 µm diameter; central hyaline area occupying c. 33–50% of valve diameter; 6–9 hyaline rays, one markedly narrower than the others, extending from centre almost to periphery of valve and ending in a protruding tubular process (Fig. b); rays more numerous in larger cells. Separating lines within central area straight. Peripheral sectors areolate; areolae in tangential lines, 5–9 in 10 µm, of uniform size (Fig.d).

Distribution

Coastal waters near Davis Station, East Antarctica; Weddell Sea (Buck & Garrison, 1983; Moison & Fryxell, 1993); Ross Sea (Watanabe, 1982; Andreoli et al., 1995); Weddell-Scotia Sea (Garrison et al., 1987); Lützow-Holm Bay (Tanimura et al., 1990); Prydz Bay, East Antarctica (Boden, 1985); Wilkes Land, Antarctica (Bunt & Wood, 1963); between the South Shetlands and Cabo de Hornos (Hendey, 1937, as C. radiculum); Southern Ocean, between 51° and 49°S, 0°08’ and 0°07’W, and 53°43’S 0°20’W, 49°S 0°07’W and 46°32’S 0°02’W (Hustedt, 1958); Southern Ocean–Davis Sea, 47–65°S (Heiden & Kolbe, 1928); KERFIX, 50°40’S 68°25’E, Southern Ocean (Kopczyńska et al., 1998).

Comments

This is one of the most common of the Antarctic Asteromphalus species.

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