Cannosphaeropsis perforata
From dinoflaj3
"perforata" Alberti, 1961, p.37, pl.9, fig.14. Holotype: Alberti, 1961, pl.9, fig.14. Originally Cannosphaeropsis, subsequently Adnatosphaeridium, thirdly Rigaudella. Taxonomic senior synonym: Cannosphaeropsis (now Rigaudella) filamentosa, according to Stancliffe and Sarjeant (1990, p.206). Age: ?Callovian.
Parent: Cannosphaeropsis