Achomosphaera recurvata
From dinoflaj3
"recurvata" Jain et al., 1975, p.8, pl.3, figs.36–37,39. Holotype: Jain et al., 1975, pl.3, fig.36. Taxonomic senior synonym: Hystrichosphaera (as and now Achomosphaera) crassipellis, according to Quattrocchio and Sarjeant (1996, p.116). Age: Maastrichtian.
Parent: Achomosphaera