Phthanoperidinium pannonium

"pannonium" (Lentin and Williams, 1973, p.106) Harker and Sarjeant, 1975, p.224.  Holotype: Nagy, 1969, pl.1, fig.1.  Name illegitimate - nomenclatural senior synonym: Palaeoperidinium (now Pyxidinopsis?) nudum Nagy, which has the same type.  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.  Palaeoperidinium pannonium is the substitute name for Palaeoperidinium nudum Nagy, 1969, p.291, pl.1, fig.1.  Age: Pannonian.

Parent: Phthanoperidinium