Operculodinium echigoense

"?echigoense" Matsuoka, 1983b, p.126, pl.7, figs.1,2a–b,3–5,8.  Holotype: Matsuoka, 1983b, pl.7, fig.5; Matsuoka et al., 1997, pl.3, figs.1–3.  Originally Operculodinium, subsequently (and now) Operculodinium?.  Questionable assignment: Mudie (1987, p.804).  Taxonomic senior synonym: Operculodinium centrocarpum, according to Matsuoka et al. (1997, p.22).  Age: early middle Miocene.

Parent: Operculodinium