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Authority

(Clap. & J.Lachm.) Kofoid & J.R.Michener (1911: 290)

Class

Dinophyceae

Order

Dinophysales

Family

Dinophysiaceae

Basionym

Dinophysis rotundata Clap. & J.Lachm. (Claparède & Lachmann, 1859: 6, pl. 20, fig. 16)

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Synonyms

Prodinophysis rotundata (Clap. & J.Lachm.) Balech (1944: 429, fig. 2)
Dinophysis whittingae Balech (1971: figs 154–167)

Additional References

Dodge (1982: 55, fig. 4I; pl. 1if), Balech (1988: 46, pl. 9, figs 1–4, as D. rotundata), Steidinger & Tangen (1997: 439, pl. 14)

Description

[after Steidinger & Tangen (1997)] Cells small, rounded to ellipsoidal, 36–56 µm long, 35–40 µm diameter. Epitheca rounded, sometimes flattened at the apex. Cingulum 5–8 µm wide, slightly incised; anterior cingular list a little wider than posterior list; both lists project laterally with rays that appear to be extensions of the surface ornamentation of the lists. Left sulcal list slightly wider and longer than right sulcal list; left sulcal list with 3 visible rays, with the right list extending to the third ray. Cell surface (thecae and cingulum) areolate; each areola with a pore. Chloroplasts absent.

Distribution

Southern Ocean 43–63°S, south of Australia; Southern Ocean, near South Georgia (Dodge & Priddle, 1987); Ross Sea (Watanabe, 1982).

Comments

We did not collect Phalacroma rotundatum, a species that is known to have a similar morphology to Dinophysis contracta (q.v.). Many authors consider Phalacroma to be synonymous with Dinophysis.

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