Hystrichosphaeridium hillii
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?hillii (Merrill, 1895, p.17; text-fig.21) Sarjeant, 1964b, p.175. Holotype: Merrill, 1895, text-fig.21. Originally Geodia (Appendix A), subsequently Hystrichosphaeridium, thirdly (and now) Hystrichosphaeridium?. Questionable assignment: Davey and Williams (1966b, p.70); and Masure and Foucher in Fauconnier and Masure (2004, p.311-312) as a problematic species. Age: Early Cretaceous.
Parent: Hystrichosphaeridium