Wilsonidium rugosum

"?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