Polysphaeridium cephalum
From dinoflaj2
"cephalum" Kar, 1979, p.34, pl.4, figs.66a-b,67. Holotype: Kar, 1979, p.34, pl.4, figs.66a-b,67. Originally Polysphaeridium, subsequently Sumatradinium, thirdly Batiacasphaera?. Taxonomic senior synonym: Operculodinium placitum, according to Jain and Garg (1991, p.81). N.I.A. Age: Oligocene.
Parent: Polysphaeridium