Polystephanephorus speciosus (Alberti, 1961) Riley and Sarjeant, 1972

Now Adnatosphaeridium?. Originally Cannosphaeropsis, subsequently Polystephanephorus, thirdly (and now) Adnatosphaeridium?. Stover and Evitt, 1978 retained this species in Cannosphaeropsis.

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