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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.

Ocean Ecosystems/ESRIG, University of Groningen and Arctic Centre, University of Groningen and the RaTS program, British Antarctic Survey.

Authority

(Grunow) Ostenf. (Ostenfeld, 1903: 6)

Class

Diatomophyceae

Order

Centrales

Family

Corethraceae

Synonyms

Corethron hispidum Castrac. (Castracane, 1886: 86, pl. 20, figs 3, 5)
Corethron criophilum Castrac. (Castracane, 1886: 85, pl. 21, fig.14)
Corethron murrayanum Castrac. (Castracane, 1886: 86, pl. 21, fig. 4)
Corethron pelagicum Brun (1891: 20, pl. 19, fig. 6)
Corethron valdiviae G.Karst. (Karsten, 1904: 544, tab. 23; 1905: 101, pl. 12, figs 1–10)

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Basionym

Actiniscus pennatus Grunow, in van Heurck (1883: pl. 82bis, figs 11, 12)

Additional References

Hendey (1937: 325–329, pl. vii, viii), Manguin (1954: 16), Hustedt (1958: 130), Hasle (1969: 77, 79, figs 23, 42), Fryxell & Hasle (1971: 335, figs 1–6), Priddle & Fryxell (1985: 54, figs A, C–I), Thomas & Bonham (1990: 105, pl. 12, figs 1, 3, 5), Moisan & Fryxell (1993: 493), Hasle & Syvertsen (1997: 96, pl. 15), Crawford et al. (1998: 5, figs 1, 6–25)

Description

Cells usually solitary, strongly silicified, cylindrical, heterovalvate; pervalvar axis 20–240 µm. Valves convex, circular; apical axis 5–82 µm. Upper valve with 2 types of spines around the margin (one long and barbed, the other short and hooked); hook with 2 distinctprojections at right angles to spine (Fig. e). Lower valve with a marginal ring of barbed spines (Fig. c); spines T-shaped at their base, inserted into sockets on valve margin. Prior to cell division, spines held within the parent cingulum (girdle) all point in the same direction; cells free of the cingulum have barbed spines orientated downwards and hooked spines orientated upwards. Spines entirely absent in some specimens. Terminal corona of hairs sometimes present (Fig. c). Cingulum composed of alternating open ligulate bands (Fig. f). Auxospores illustrated by Karsten (1904, tab. 23, as C. valdiviae).

Distribution

Antarctic inshore waters (Fryxell & Hasle, 1971); near Davis Station, East Antarctica (Archer et al., 1996); Heard I. (Manguin, 1954); Ross Sea (Hendey, 1937; Andreoli et al., 1995); KERFIX, 50°40’S 68°25’E, Southern Ocean (Kopczyńska et al., 1998); Southern Ocean, south of the Antarctic Polar Front, cosmopolitan through tropical waters to the Arctic (Thomas & Bonham, 1990); Weddell-Scotia Sea (Garrison et al., 1987).

Comments

N/A

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