Hystrichodinium isodiametricum

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