Hystrichosphaeridium echinatum
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?echinatum Menéndez, 1965, p.12-13, pl.2, fig.9. Holotype: Menéndez, 1965, pl.2, fig.9. Originally Hystrichosphaeridium, subsequently (and now) Hystrichosphaeridium?. Questionable assignment: Stover and Evitt (1978, p.56) as a problematic species. Age: Late Cretaceous.
Parent: Hystrichosphaeridium
