Dichadogonyaulax pachyderma

"pachyderma" (Deflandre, 1939a, p.176–178, pl.7, figs.6–10; text-figs.7–10) Courtinat, 1989, p.211.  Holotype: Deflandre, 1939a, pl.7, figs.6–7.  NOW Korystocysta.  Originally Gonyaulax (Appendix B), subsequently Gonyaulacysta, thirdly Ctenidodinium, fourthly Ctenidodinium?, fifthly (and now) Korystocysta, sixthly Dichadogonyaulax.  Taxonomic junior synonyms: Leptodinium (as Korystocysta) norrisii, according to Benson (1985, p.154); Dichadogonyaulax (subsequently Korystocysta) kettonensis, by implication in Conway (1990, p.35), who considered Dichadogonyaulax kettonensis to be the senior name — however, Lentin and Williams (1993, p.374) retained Dichadogonyaulax (as Korystocysta) kettonensis.  Age: Oxfordian.

Parent: Dichadogonyaulax