Hystrichosphaeridium paradoxum
From dinoflaj3
"paradoxum" Brosius, 1963, p.41–42, pl.4, figs.1,6; text-fig.2, nos.1a–c. Holotype: Brosius, 1963, pl.4, fig.6; Fensome et al., 1995, fig.2 — p.1639. NOW Distatodinium. Originally Hystrichosphaeridium, subsequently Tanyosphaeridium, thirdly Oligosphaeridium?, fourthly (and now) Distatodinium, fifthly Bipolaribucina. Taxonomic junior synonym: Distatodinium craterum, according to Fensome et al. (2009, p.31). Age: late Oligocene.
Parent: Hystrichosphaeridium