Palaeotetradinium hyalodermum

"hyalodermum" Cookson, 1956, p.188-189, pl.1, figs.12-16. Holotype: Cookson, 1956, pl.1, figs.12-13. NOW Dorsennidium (Appendix A). Originally Palaeotetradinium, subsequently Veryhachium (Appendix A), thirdly Goniosphaeridium (Appendix A), fourthly (and now) Dorsennidium (Appendix A). Age: Albian-Cenomanian.