Pyxidinopsis "?pannonia" (Lentin and Williams, 1973, p.106) Head, 1994a, p.308. Holotype: Nagy, 1969, pl.1, fig.1. Name illegitimate — nomenclatural senior synonym: Palaeoperidinium (now Pyxidinopsis?) nudum, which has the same holotype. 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 (and now) Pyxidinopsis? nuda. Questionable assignment: Head (1994a, p.308). See also the discussion under Pyxidinopsis? nuda. Age: late Miocene.

Head 1994, p. 308:
The most recent previous name for this species was Tectatodinium pannonium (Lentin and Williams 1973) Lentin and Williams 1981. This species is here removed from Tectatodinium because the luxuria is not spongy or lanate. However, details of the luxuria are uncertain and thus its transfer to Pyxidinopsis Habib 1975 is provisional.