Heterosphaeridium difficile
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difficile (Manum and Cookson, 1964, p.12-14, pl.3, figs.1-3,7) Ioannides, 1986, p.24. Holotype: Manum and Cookson, 1964, pl.3, fig.1; Fauconnier and Masure, 2004, pl.36, figs.2-4. Originally Hystrichosphaeridium, subsequently Cordosphaeridium? (combination not validly published), thirdly (and now) Heterosphaeridium. Age: Cenomanian.
