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

Authority

(Brightw.) Cleve (1868: 663)

Class

Diatomophyceae

Order

Centrales

Family

Biddulphiaceae

Synonyms

Biddulphia arctica (Brightw.) C.S.Boyer (1901: 714)

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Basionym

Triceratium arcticum Brightw. (Brightwell, 1853: 250, pl. 4, fig. 11)

Additional References

Hendey (1937: 282, pl. 10, fig. 1), Hoban (1983: 277, figs 37–42), Everitt & Thomas (1986: 9, fig. 3B), Round et al. (1990: 254)

Description

Cells solitary or in zig-zag chains, triangular in valve view (Fig. a–c) and slightly elevated at the corners, rectangular in girdle view. Apical axis 150–350 µm; areolae polygonal, radiating in rows from the centre, 3–4 per 10 µm in central region, smaller at valve corners where they form pseudocelli; central grouping of small labiate processes (Fig. f); valves with external cribrum-like rotae (Fig. b, e) and internal foramina (Fig. c, f). Girdle short, covered in fine punctae arranged in straight vertical lines (Fig. a).

Distribution

Inexpressible I., 74°54’S 163°46’E, Ross Sea; inshore Davis Station, Prydz Bay, East Antarctica (Everitt & Thomas, 1986); Southern Ocean, 62°59’S 57°28’W, off Enderby Land (Hendey, 1937); Wilkes Land, Antarctica (Bunt & Wood, 1963).

Comments

Everitt & Thomas (1986) reported this as a benthic diatom that can become mixed into the water column in winter. Hendey (1937) described its habitat as littoral and commonly epiphytic.

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