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Dinogymnium hexagonum
From Fensome et al., 2019:
Dinogymnium? hexagonum (Deflandre-Rigaud, 1954, p.58, text-figs.1–2) Evitt et al., 1967, p.20. Holotype: Deflandre-Rigaud, 1954, text-figs.1–2. Originally Gymnodinium (Appendix B), subsequently Dinogymnium, thirdly (and now) Dinogymnium?. Questionable assignment: Stover and Evitt (1978, p.38) as a problematic species. Age: Campanian–?Maastrichtian.
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Original description (Deflandre-Rigaud, 1954) Translation PKB 2025:
Gymnodinium hexagonum. Cell outline hexagonal. Transverse groove not hollowed. Longitudinal groove slightly marked on the hypotheses. Membrane slightly ornamented, reddish brown, 0.7 to 1 µm thick; 20 µm long; 22 µm wide. Holotype BW 39. Provisional generic attribution.
Dinogymnium? hexagonum (Deflandre-Rigaud, 1954, p.58, text-figs.1–2) Evitt et al., 1967, p.20. Holotype: Deflandre-Rigaud, 1954, text-figs.1–2. Originally Gymnodinium (Appendix B), subsequently Dinogymnium, thirdly (and now) Dinogymnium?. Questionable assignment: Stover and Evitt (1978, p.38) as a problematic species. Age: Campanian–?Maastrichtian.
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Original description (Deflandre-Rigaud, 1954) Translation PKB 2025:
Gymnodinium hexagonum. Cell outline hexagonal. Transverse groove not hollowed. Longitudinal groove slightly marked on the hypotheses. Membrane slightly ornamented, reddish brown, 0.7 to 1 µm thick; 20 µm long; 22 µm wide. Holotype BW 39. Provisional generic attribution.