Impagidinium membranigerum

"?membranigerum" (Gerlach, 1961, p.162–164, pl.26, figs.1–4,7; text-figs.4–5) Stover and Evitt, 1978, p.166.  Emendation: Sarjeant, 1984b, p.75–76, as Leptodinium membranigerum.  Holotype: Gerlach, 1961, pl.26, figs.1–3, lost according to Sarjeant (1984b, p.75).  Lectotype: Gerlach, 1961, pl.26, fig.7; text-fig.5; Sarjeant, 1984b, pl.1, figs.1,3; text-figs.1A–B; Jan du Chêne et al., 1986a, pl.67, figs.17–18; designated by Sarjeant (1984b, p.75).  NOW Leptodinium.  Originally (and now) Leptodinium, subsequently Impagidinium?.  Questionable assignment: Stover and Evitt (1978, p.166).  Age: late Oligocene.

Parent: Impagidinium