Cannosphaeropsis speciosa, Alberti, 1961

Now Adnatosphaeridium?. Originally Cannosphaeropsis, subsequently Polystephanephorus, thirdly (and now) Adnatosphaeridium?.
Riley and Sarjeant, 1972, transferred this species to Polystephanephorus Sarjeant, 1961. Stover and Evitt, 1978, retained it as a problematical species of Cannosphaeropsis.

Holotype: Alberti, 1961, pl.9, fig.13; Stancliffe and SarJeant, 1990, pl.5, fig.6
Age: Bathonian- Callovian