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Authority

Castrac. (Castracane, 1886: 78, text fig.)

Class

Diatomophyceae

Order

Centrales

Family

Chaetoceraceae

Synonyms

Chaetoceros criophilus auct. non Castracane (1886), sensu Cleve (1897: 20, pl. 1, fig. 6)
Chaetoceros brightwellii auct. non Cleve (1873), sensu Gran (1897: 11, pl. 1, fig. 1)

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Basionym

N/A

Additional References

Meunier (1910: 218, pl. 24, figs 17–19), Hustedt (1930: 668, fig. 378), Lebour (1930: 119, fig. 86), Hendey (1937: 293), Manguin (1960: 279, pl. 8, figs 94–97), Moisan & Fryxell (1993: 493), Priddle & Fryxell (1985: 28, figs A–F), Hasle & Syvertsen (1997: 199, pl. 41)

Description

Cells united to form curved or slightly twisted chains, heterovalvate; pervalvar axis 15–28 µm. Valves circular; apical axis 10–30 µm; upper valve domed; lower valve flat; small central spine often obscured. Apertures between cells small, frequently obscured. Setae long, thin, bent towards lower end of chain, spinose throughout their length; setae of upper valve arising from the centre, forming a vault-like structure, those of lower valve arising from near the valve margin; setae of lower valve of terminal cell often converge inwards to end of chain and cross over. Chloroplasts numerous, small, spherical.

Distribution

Southern Ocean, south of Australia; Franklin I., 76°09.59’S 168°20.36’E, Ross Sea; Weddell Sea (Moisan & Fryxell, 1993); Weddell-Scotia Sea (Garrison et al., 1987); Southern Ocean (south-west of Kerguelen Is.; Hendey, 1937); Atlantic and northern European seas (Ricard, 1987); Terre Adélie (Manguin, 1960).

Comments

N/A

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