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Authority

Brightw. (Brightwell, 1858: 95, pl. 5, fig. 6)

Class

Diatomophyceae

Order

Centrales

Family

Rhizosoleniaceae

Synonyms

Rhizosolenia striata Grev. (Greville, 1865: 234, pl. 3, fig. 4)
Rhizosolenia shrubsolei Cleve (1881: 26)
Rhizosolenia imbricata var. striata (Grev.) Grunow, in van Heurck (1882: pl. 79, figs 3, 7)
Rhizosolenia imbricata var. shrubsolei (Cleve) Schröder (1906b: 346)

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Basionym

N/A

Additional References

Hustedt (1927–30: 580, fig. 331), Hendey (1937: 316; 1964: 149, pl. 3, fig. 1), Priddle & Fryxell (1985: 90, figs A–E, as R. shrubsolei), Sundström (1986: 80, figs 200–208), Hasle & Syvertsen (1997: 155, pl. 29, tab. 35)

Description

Cells solitary or in pairs or chains, long, cylindrical; pervalvar axis to 400 µm. Valves obliquely conical to flattened, finely areolate; apical axis 2.5–57 µm. Process short, 8–18 µm, swollen at the base and narrowing abruptly to a distal tube (Fig. d). Otaria small, extending along the swollen part of the process. Claspers conspicuous. Girdle bands forming 2 dorsiventral columns of segments, finely areolate; areolae 10–18 in 10 µm, arranged in oblique striae.

Distribution

Prydz Bay, ADBEX; Southern Ocean, south of Australia; Weddell-Scotia Confluence (Garrison et al., 1987, as R. schrubsolei); Southern Ocean (Priddle & Fryxell, 1985).

Comments

Although agreeing with other morphological features described for R. imbricata, cells collected from the Southern Ocean (Thomas, ADBEX) have a shorter valve process (2.8–3.2 µm long).

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