Operculodinium longispinigerum
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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