From Fensome et al., 2019:
Wallodinium elongatum (Beju, 1971) Duxbury, 1980; Emendations: Feist-Burkhardt and Monteil, 1994, p.9, as Andreedinium elongatum; Riding, 1994, p.16, as Phallocysta elongata.
NOW Phallocysta. Originally Fromea (acritarch), subsequently Fromea? (acritarch), thirdly Wallodinium, fourthly Palaeostomocystis (acritarch), fifthly Andreedinium, sixthly (and now) Phallocysta.
Nomenclatural junior synonym: Phallocysta minuta; refer to that species for details.
Taxonomic senior synonym: Prismatocystis (as and now Wallodinium) cylindrica, according to Duxbury (1983, p.68) — however, Feist-Burkhardt and Monteil in Feist-Burkhardt (1990, p.615) retained Wallodinium (as Andreedinium) elongatum.
Taxonomic junior synonym: Phallocysta subconica, according to Riding (1994, p.16).

Holotype: Beju, 1971, pl.3, fig.7, text-fig.6A
Locus typicus: well at Plaviceni, Roumania
Sratum typicum: Bajocian-Oxfordian

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Original diagnosis: Beju, 1971, p.289: Fromea elongata
Shell formed of two distinct parts: a subspherical or slightly elongated chamber prolonged by a subcylindrical or slightly conical neck, wide opened at its apical end. The transition from the chamber to the neck is gradual but always recognizable on the borders. Neck/chamber ratio 1/4 to 1/3, Shell wall relatively thin (0.5 - 1.5 µm) levigate to finely punctate. Opening wide, subcircular with smooth or slightly undulated margins.
Dimensions: Overall length: 46 - 70 µm; overall width 24 - 36 µm.