Gonyaulacysta? nuda (Nagy, 1969, p.291) Lentin and Williams, 1976, p.110

NOW Pyxidinopsis? nuda. Originally Palaeoperidinium nudum Nagy, subsequently Palaeoperidinium pannonium (name illegitimate), thirdly Phthanoperidinium pannonium (name illegitimate), fourthly Gonyaulacysta? nuda, fifthly Tectatodinium nudum, sixthly Tectatodinium? pannonium (name illegitimate), seventhly Pyxidinopsis? pannonia (name illegitimate), eighthly Pyxidinopsis? nuda. Questionable assignment: Lentin and Williams (1976, p.110).
Nomenclatural junior synonym: Palaeoperidinium (subsequently Phthanoperidinium, Tectatodinium? and Pyxidinopsis?) pannonium, which has the same holotype. See also the discussion under Pyxidinopsis? nuda.

Holotype: Nagy, 1969, pl.1, fig.1
Age: late Miocene.