Operculodinium longispinigerum

longispinigerum Matsuoka, 1983b, p.125, pl.9, figs.5–7,8a–b,9.  Holotype: Matsuoka, 1983b, pl.9, figs.8a–b; Head and Wrenn, 1992, pl.5, figs.4,8,11.  Age: late Miocene–early Pleistocene.

Parent: Operculodinium