Phthanoperidinium filigranum
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filigranum (Benedek, 1972, p.12-13, pl.4, figs.3a-b) Benedek and Sarjeant, 1981, p.325-327. Holotype: Benedek, 1972, pl.4, figs.3a-b; Benedek and Sarjeant, 1981, figs.4,8, nos.1-2. Originally Deflandrea?, subsequently Vozzhennikovia?, thirdly Dioxya, fourthly (and now) Phthanoperidinium. Bujak and Davies (1983, p.163) also proposed this combination. Age: mid Oligocene.
