Hystrichosphaeridium calvum
From dinoflaj2
?calvum Tasch in Tasch et al., 1964, p.193, pl.1, fig.21. Holotype: Tasch et al., 1964, pl.1, fig.21; Fauconnier and Masure, 2004, pl.43, figs.9-10. Originally Hystrichosphaeridium, subsequently (and now) Hystrichosphaeridium?. Questionable assignment: Stover and Evitt (1978, p.56) as a problematic species. Age: Albian.
Parent: Hystrichosphaeridium
