Canningia? circularis, Cookson and Eisenack, 1971

Now Kallosphaeridium?. Originally Canningia, subsequently Canningia?, thirdly Batiacasphaera, fourthly (and now) Kallosphaeridium?.
Stover and Evitt (1978, p.25) considered this to be a provisionally accepted species of Canningia.

Holotype: Cookson and Eisenack, 1971, pl.8, fig.6
Age: Middle Cretaceous, probably Turonian