Hystrichosphaeridium difficile

"difficile" Manum and Cookson, 1964, p.12–14, pl.3, figs.1–3,7.  Holotype: Manum and Cookson, 1964, pl.3, fig.1; Fauconnier and Masure, 2004, pl.36, figs.2–4.  NOW Heterosphaeridium.  Originally Hystrichosphaeridium, subsequently Cordosphaeridium? (combination not validly published), thirdly (and now) Heterosphaeridium.  Age: Cenomanian.

Parent: Hystrichosphaeridium