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Authority

(O’Meara) I.V.Makarova & V.A.Nikolajev (1983: 89, pl. 1, figs 1–11; pl. 2, figs 1–11)

Class

Diatomophyceae

Order

Centrales

Family

Thalassiosiraceae

Synonyms

Podosira (?) oliveriana (O’Meara) Grunow, in van Heurck (1880–85: tab. 118, fig. 5)
Micropodiscus oliveriana (O’Meara) Grunow, in van Heurck (1880–85: tab. 118, fig. 5)
Actinocyclus antarcticus Castrac. (Castracane, 1886: 145)
Actinocyclus umbonatus Castrac. (Castracane, 1886: 145, tab. 4, fig. 4)
Schimperiella antarctica G.Karst. (Karsten, 1905: 88, tab. 8, fig. 6)
Schimperiella valdiviae G.Karst. (Karsten, 1905: 88, tab. 8, fig. 7a, b)
Actinocyclus antarcticus G.Karst. (Karsten, 1905: 91, tab. 9, fig. 2), nom. illeg.
Actinocyclus bifrons G.Karst. (Karsten, 1905: 92, tab. 9, fig. 8)
Actinocyclus janus G.Karst. (Karsten, 1905: 92, tab. 9, fig. 7)
Actinocyclus similis G.Karst. (Karsten, 1905: 92, tab. 9, fig. 4)
Actinocyclus valdiviae G.Karst. (Karsten, 1905: 92, tab. 9, fig. 3)
Actinocyclus excentricus Perag. (Peragallo, 1921: 75, tab. 6, fig. 6)
Schimperiella oliveriana (O’Meara) Sournia, in Sournia et al. (1979: 191, figs 8, 9), as oliverana

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Basionym

Actinocyclus oliverianus O’Meara (1877: 58, tab. 1, fig. 7)

Additional References

Kopczyńska & Ligowski (1985: tab. 2), Priddle & Fryxell (1985: 146, figs A, B), Fryxell & Johansen (1990: 99)

Description

Cells discoid. Valves circular, 23–60 µm diameter. Areolation radial to irregular, fine to coarse; areolae 7–8 in 10 µm in the centre, 9–14 in 10 µm nearer the margin; marginal band broad, distinctive, with fine areolation. Strutted processes in 1 marginal ring within marginal band, 3 in 10 µm. Labiate process solitary, large, near the margin.

Distribution

Antarctic and sub-Antarctic (Fryxell & Johansen, 1990); Drake Passage (Kopczyńska & Ligowski, 1985); Heard I. (Manguin, 1954); Cape Margérie, 66°50’S 141°25’E, Terre Adélie (Manguin, 1960, both as as Actinocyclus oliverianus).

Comments

The broad, marginal band of striae is a conspicuous feature of this species. Many early Antarctic records were cited as Schimperiella oliverana, and the epithets oliverana and oliveriana appear to have been used interchangeably.

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