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Authority

(A.W.F.Schmidt) G.A.Fryxell & P.A.Sims, in Fryxell et al. (1986: 19, figs 17, 18.1–18.5, 30.3, 30.4)

Class

Diatomophyceae

Order

Centrales

Family

Hemidiscaceae

Synonyms

Coscinodiscus radiatus H.L.Sm. (Smith, 1874–79: no. 98)
Coscinodiscus nodulifer var. apiculata A.W.F.Schmidt (1878), in Schmidt et al. (1874–1959: 15, pl. 59, fig. 20) (fide Rattray, 1890a: 520)

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Basionym

Coscinodiscus nodulifer A.W.F.Schmidt (1878), in Schmidt et al. (1874–1959: 15, pl. 59, figs 22, 23) (fide Rattray, 1890a: 520)

Additional References

DeToni (1894: 1249), Mann (1907: 255), Karsten (1907: 264, pl. 36, fig. 6), Boyer (1926–27: 55), Hustedt (1927–30: 426, fig. 229), Hendey (1937: 248; 1964: 77, pl. 22, fig. 10), Fryxell & Hasle (1972: 69), Hasle & Syvertsen (1997: 126, pl. 21)

Description

Cells solitary, cylindrical; pervalvar axis 17–18 µm. Valves flat, circular; apical axis 20–102 µm. Areolae in radial rows, 3–8 in 10 µm, each areola surrounded by 6 small granules giving a hexagonal pattern to valve; areolae on mantle in 2 rows under a thickened ridge; areolae adjacent to the ridge tear-drop-shaped, those beside the hyaline margin elongated pentagons. Striae on mantle 5–8 in 10 µm. Central labiate process with a tubular rim; marginal processes 1–2 in 10 µm, internally perpendicular to radius.

Distribution

Southern Ocean, south of Australia; Prydz Bay, East Antarctica (Ligowski, 1983); type locality, Gulf of Mexico (Schmidt, 1878); Ross Sea (Watanabe, 1982).

Comments

Rattray (1890a) based Coscinodiscus nodulifer var. apiculata on Schmidt’s illustration (1878, pl. 59. fig. 20), which is of a partial valve but one that clearly shows the irregular radial areolation, central process, and periodicity around the margin as in the modern circumscription of A. nodulifera. Here we include C. nodulifer var. apiculata of Schmidt (1878, fig. 20) in synonymy with A. nodulifera.

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