Hystrichodinium isodiametricum
From dinoflaj2
isodiametricum (Cookson and Eisenack, 1958, p.38, pl.12, figs.11-12) Stover and Evitt, 1978, p.161. Holotype: Cookson and Eisenack, 1958, pl.12, figs.11-12. Originally Palaeohystrichophora, subsequently (and now) Hystrichodinium. Age: Campanian-Early Maastrichtian.
Parent: Hystrichodinium