Wilsonidium rugosum
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"?rugosum" (Stanley, 1965, p.222–223, pl.21, figs.6–11) Lentin and Williams, 1976, p.140. Holotype: Stanley, 1965, pl.21, figs.10–11. NOW Spinidinium. Originally Wetzeliella, subsequently Wilsonidium?, thirdly Wetzeliella?, fourthly (and now) Spinidinium. Questionable assignment: Lentin and Williams (1976, p.140). Age: Paleocene.
Parent: Wilsonidium