Cleistosphaeridium parvum
From dinoflaj3
"parvum" Davey, 1969a, p.157–158, pl.7, figs.11–12. Holotype: Davey, 1969a, pl.7, fig.11. Taxonomic senior synonym: Palaeostomocystis (as and now Diacrocanthidium) echinulatum (Appendix A), according to Bujak in Bujak et al. (1980, p.52). Age: early–late Cenomanian.
Parent: Cleistosphaeridium