Hystrichogonyaulax polytrix

"polytrix" Benedek, 1972, p.20, pl.6, figs.1a–b.  Emendation: Benedek and Sarjeant, 1981, p.330–333, as Phthanoperidinium polytrix. Holotype: Benedek, 1972, pl.6, figs.1a–b; Benedek and Sarjeant, 1981, fig.2, nos.4,6, fig.6.  NOW Phthanoperidinium.  Originally Hystrichogonyaulax, subsequently Phthanoperidinium?, thirdly (and now) Phthanoperidinium.  Age: middle Oligocene.

Parent: Hystrichogonyaulax