Info

" Mentioned in the text for comparison. ' —, No data.

" Mentioned in the text for comparison. ' —, No data.

Thalassiosira lineata Jousé (Plate 10, Table 13)

References: Jousé, 1968, p. 13, Plate 1, Figs. 1 and 2; Hasle, 1976a, Figs. 22-28; Hasle 8c Fryxell, 1977b, p. 22, Figs. 15-25. Girdle view: Valve face flat; mantle low. Observed as single cells. Valve view: Hexagonal areolae in strictly straight rows throughout the whole valve face. Strutted processes scattered over the whole valve; two marginal rings of strutted processes (not revealed with LM); one large labiate process.

Distinctive features: Straight areola rows; distinct strutted processes on the valve face (LM). Remarks: The scattered processes are readily seen in water mounts. Thalassiosira lineoides Herzig 8c G. Fryxell is distinct from T. lineata by certain differences in the location and structure of the scattered processes, mainly discernible with SEM (Herzig 8c Fryxell, 1986).

Distribution:

T. lentiginosa—southern cold water region.

T. lineata—warm water region.

T. lineoides—warm water region to temperate(?).

B. Labiate process on valve face. 1. One central or subcentral strutted process.

Thalassiosira bioculata (Grunow) Ostenfeld (Plate 12, Table 14) Basionym: Coscinodiscus bioculatus Grunow. References: Grunow, 1884, pp. 107 and 108, Plate 3, Fig. 30, Plate 4, Fig. 2; Ostenfeld, 1903, p. 564, Fig. 120; Meunier, 1910, p. 266, Plate 29, Figs. 45-62; Hustedt, 1930, p. 331, Fig. 168. Girdle view: Cells cylindrical; pervalvar axis up to twice as long as cell diameter; valve face flat or slightly convex; mantle low and rounded. Connecting thread thin and short.

T. bioculata

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