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Dinogymnium nelsonense
From Fensome et al., 2019:
Gymnodinium nelsonense (Cookson, 1956, p.183, pl.1, figs.8–11) Evitt et al., 1967, p.21–23. Holotype: Cookson, 1956, pl.1, fig.10; Helby et al., 1987, fig.42C; Lentin and Vozzhennikova, 1990, pl.2, fig.8. Originally Gymnodinium (Appendix B), subsequently (and now) Dinogymnium. Taxonomic junior synonym: Gymnodinium (as Dinogymnium) hyalinum, according to Lentin and Vozzhennikova (1990, p.21). Age: Senonian.
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Original description: Cookson, 1965, p.183
The cell is roughly fusiform with a delicate, finely and faintly granular membrane; usually it is more or less longitudinally folded and at approximately half its length transversely crumpled, so that the nature and even the existence of a transverse girdle is difficult to determine; a slight waist-like narrowing (Plate 1, Fig. 8) delimits a broad "epitheca" with a bluntly rounded apex from a somewhat longer "hypotheca", which gradually narrows towards a rounded or truncate antapex; frequently a small oval opening seems to be present at this end of the cell (Plate 1, Fig. 10).
Dimensions (approximate on account of folding). Holotype: length 70 µm, width 38 µm. Paratypes, 120x39 µm, 75x36 µm.
Gymnodinium nelsonense (Cookson, 1956, p.183, pl.1, figs.8–11) Evitt et al., 1967, p.21–23. Holotype: Cookson, 1956, pl.1, fig.10; Helby et al., 1987, fig.42C; Lentin and Vozzhennikova, 1990, pl.2, fig.8. Originally Gymnodinium (Appendix B), subsequently (and now) Dinogymnium. Taxonomic junior synonym: Gymnodinium (as Dinogymnium) hyalinum, according to Lentin and Vozzhennikova (1990, p.21). Age: Senonian.
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Original description: Cookson, 1965, p.183
The cell is roughly fusiform with a delicate, finely and faintly granular membrane; usually it is more or less longitudinally folded and at approximately half its length transversely crumpled, so that the nature and even the existence of a transverse girdle is difficult to determine; a slight waist-like narrowing (Plate 1, Fig. 8) delimits a broad "epitheca" with a bluntly rounded apex from a somewhat longer "hypotheca", which gradually narrows towards a rounded or truncate antapex; frequently a small oval opening seems to be present at this end of the cell (Plate 1, Fig. 10).
Dimensions (approximate on account of folding). Holotype: length 70 µm, width 38 µm. Paratypes, 120x39 µm, 75x36 µm.