Isabelidinium amphiatum

?amphiatum (McIntyre, 1975, p.65–66, pl.2, figs.5–8) Lentin and Williams, 1977a, p.167.  Holotype: McIntyre, 1975, pl.2, figs.5–6.  Originally Deflandrea, subsequently Isabelia (combination illegitimate), thirdly (and now) Isabelidinium?, fourthly Alterbia (combination illegitimate).  Lentin and Williams (1985, p.199) retained this species in Isabelidinium.  Questionable assignment: Lentin and Williams (1977a, p.167).  Age: Campanian–Maastrichtian.

Parent: Isabelidinium