Operculodinium taiwanianum Shaw Chenglong, 1999b, p.174–176, figs.45–51.

Holotype: Shaw Chenglong, 1999b, figs.46–48.
Age: Eocene.

Original description (Shaw Chenglong, 1999b):
Operculodinium taiwanianum Shaw, sp.nov.
Description: Spherical to ellipsoidal cyst, diameter 38-46 µm, covered with numerous straight, slender processes placed irregularly or with a certain alignment. Processes solid, showing radiating fibrils at their point of intersection on the shell. Thickness of autophragm exclusively or ornamentation about 1 µm. Surface view of the cyst ornamented with finely granula. Precingular archeopyle type, operculum free.
Dimensions: Holotype – Overall 53 µm long, 54 µm wide, cyst 37 µm long, 40 mm wide, surface features with acicular processes, acicular 7-9 µm. Range – Overall 44-53 µm long, 43-54 µm wide, cyst 32-37 µm long, 34-40 µm wide, surface features with acicular processes, acicular 6-9 µm long (n = 3).
Stratigraphic occurrence: Eocene (OK-3 well, 1750m, 1760m).
Derivation of name: the specific epithet, taiwaniana is derived from the name of the type locality.
Remarks: the species differs from the type species O. centrocarpum in having a finely granulate ornament of the cyst.