Pentagonum huanghuaense Jiabo, 1978

Now Palaeoperidinium. Originally Pentagonum (an illegitimate generic name), subsequently (and now) Palaeoperidinium. The species name Pentagonum huanghuaense is validly published even though the generic name Pentagonum is illegitimate; see I.C.B.N. Article 68.1.

Holotype: Jiabo, 1978, pl.1, fig.1
Age: Early Tertiary