APPENDIX

Floral list and taxonomic remarks on the genus Thalassiosira species are as follows: original and amended descriptions portrayed through figures and detailed descriptions can be traced through Johansen and Fryxell (1985), Dumont et al. (1986), Bodén (1993), Shiono (2000, 2001), and Shiono and Koizumi (2000, 2001). Examples are show in Plates P1, P2, P3, P4.

Thalassiosira bipora Shiono, 2000 (Pl. P1, figs. 1-7).

Thalassiosira bipora f. prima Shiono, 2001 (Pl. P2, figs. 1-7).

Thalassiosira centra Shiono, 2000.

Thalassiosira depressa Shiono, 2000.

Thalassiosira exceptiuncula Shiono, 2001 (Pl. P4, fig. 9).

Thalassiosira frenguelliopsis Fryxell and Johansen, 1985 in Johansen and Fryxell (Pl. P4, figs. 4-7, 10, 11).

Thalassiosira praeoestrupii Dumont, Baldauf, and Barron, 1986 (Pl. P3, figs. 1-7; Pl. P4, figs. 1-3).
Remarks: A specimen on Pl. P4, figs. 1-3, which possesses a trifultate fultoportula with four trifultate structures and four operculate structures, is found in Sample 186-1150B-6R-CC. In this study, we identify the specimen as Thalassiosira cf. praeoestrupii because T. praeoestrupii also has the trifultate fultoportula with two kinds of structures. However, T. praeoestrupii sensu stricto possesses the trifultate fultoportula with three trifultate structures and three operculate structures. As an operculate fultoportula with four operculate structures represents a common structure in the genus Thalassiosira, this specimen is recognizable as a primitive form among several taxa with trifultate fultoportula.

Thalassiosira tetraoestrupii Bodén, 1993 (Pl. P4, figs. 8, 12).