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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

(Castrac.) Mangin (1914: 480, figs 7, 8)

Class

Diatomophyceae

Order

Centrales

Family

Hemiaulaceae

Synonyms

Eucampia balaustium Castrac. (Castracane, 1886: 97, pl. 18, fig. 5), Hendey (1937: 285), Manguin (1954: 19), Hustedt (1958: 136, figs 40–43), Jousé et al. (1962: 82, pl. 5, figs 14–17), Hoban et al. (1980: 592, figs 1–14), Syvertsen & Hasle (1983: 181, figs 4, 84–129)
Eucampia balaustium Castrac. var. minor Castrac. (Castracane, 1886: 98, pl. 18, fig. 6)
Eucampia antarctica (Castrac.) Mangin f. spiralis Mangin (1915: 63)
Eucampia balaustium Castrac. f. hiberna Heiden, in Heiden & Kolbe (1928: 535)
Eucampia balaustium Castrac. f. aestiva Heiden, in Heiden & Kolbe (1928: 536)

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Basionym

Moelleria antarctica Castrac. (Castracane, 1886: 98, pl. 18, fig. 8)

Additional References

Priddle & Fryxell (1985: 66, figs A–D), Fryxell et al. (1989: 638), Hasle & Syvertsen (1990c: 129, pl. 16.1, figs 7–13), Fryxell & Prasad (1990: 33), Moisan & Fryxell (1993: 493)

Description

Cells solitary, in doublets or spiralling chains, the spiralling a result of asymmetrical growth of the valve and girdle bands; occurring as vegetative cells (Fig. a) or heavily silicified ‘winter’ resting spores (Fig. b). Vegetative cell pervalvar axis 70–120 µm; resting spore pervalvar axis 30–52 µm; ratio between apical and pervalvar axes variable. Horns broad, flattened and ocellate (vegetative cell, Fig. a) or tapering (secondary valve of resting spore, Fig. b). Valves elliptical; apical axis 18–92 µm; rows of large areolae, 3–10 in 10 µm, radiating from a central annulus (Fig. c–e). Labiate process solitary, marginal (Fig. c). Vela are complex cribra (Fig. e, f). See Syvertsen & Hasle (1983) for a full description (as E. balaustium).

Distribution

Prydz Bay, East Antarctica; type locality (of E. balaustium) is recorded as Antarctic Ocean (Castracane, 1886); Weddell Sea (Buck & Garrison, 1983; Fryxell, 1989); Heard I. (Manguin, 1954); Wilkes Land, Antarctica (Bunt & Wood, 1963); Indian Ocean sector of the Antarctic (Kopczyńska et al., 1986); Weddell-Scotia Sea (Garrison et al., 1987); coastal waters off Syowa Station, East Antarctica (Ishikawa et al., 2001).

Comments

N/A

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