' Distance between marginal processes. k —, No data.

' Distance between marginal processes. k —, No data.

end of each edge row. Large labiate process at the edge of a central annulus. Mantle extremely fine in structure (20 striae in 10 ju,m).

Azpeitia ttodulifera (A. Schmidt) G. Fryxell & P. A. Sims in Fryxell et al. (Plate 21, Table 27)

Basionym: Coscinodiscus nodulifer A. Schmidt.

References: Schmidt, 1878, Plate 59, Figs. 20, 22, and 23; Hustedt, 1930, p. 426, Fig. 229; Fryxell et al. 1986a, p. 19, Figs. 17, 18-1-18-5, 30-3, and 30-4; Takano, 1990, pp. 254-255. Heavily silicified with flat valves and vertical mantle. Areolation radial with large and small areolae mixed. Marginal ridge straight.

Azpeitia tabularis (Grunow) G. Fryxell & P. A. Sims in Fryxell et al. (Plate 20, Table 27)

Basionym: Coscinodiscus tabularis Grunow. References: Schmidt, 1878, Plate 57, Fig. 43; Grunow, 1884, p. 86; Hustedt, 1930, p. 427, Fig. 230; Fryxell et al. 1986b, p. 16, Figs. 14, 15, and 30-1.

Distinctive hyaline ring between valvar areolae and rows of mantle areolae. Areolation radial. Marginal processes wide apart. A wide range of morphological variation was noted by Fryxell et al. (1986b).


A. africana, A. barronii, A. neocrenulata, and A. nodulifera—warm water region.

A. tabularis—southern cold water region with a preference for subantarctic waters. How to identify: Cleaned frustules on permanent mounts observed in valve view will usually be necessary for a correct identification. Azpeitia africana will be readily recognized with LM by the central area and the marginal

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