Gonyaulacysta irmoechinata
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"irmoechinata" (Heisecke, 1970, p.230, pl.1, fig.3; pl.2, figs.2–3) Lentin and Williams, 1976, p.41. Holotype: Heisecke, 1970, pl.1, fig.3; pl.2, figs.2–3. NOW Spinidinium? Originally Deflandrea, subsequently Gonyaulacysta, thirdly (and now) Spinidinium?, fourthly Volkheimeridium. Age: early Paleocene.
Parent: Gonyaulacysta