Hystrichosphaeridium pachydermum
From dinoflaj2
"?pachydermum" Cookson and Eisenack, 1960b, p.251-252, pl.38, fig.5; text-fig.5. Holotype: Cookson and Eisenack, 1960b, pl.38, fig.5; Fauconnier and Masure, 2004, pl.48, fig.10. NOW Impletosphaeridium. Originally Hystrichosphaeridium, subsequently Polysphaeridium, thirdly Hystrichosphaeridium?, fourthly Dapsilidinium, fifthly (and now) Impletosphaeridium. Questionable assignment: Stover and Evitt (1978, p.56) as a problematic species. Age: Oxfordian-Tithonian.
Parent: Hystrichosphaeridium
