Hystrichosphaeridium collum
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?collum Tasch in Tasch et al., 1964, p.194, pl.2, figs.7,16. Holotype: Tasch et al., 1964, pl.2, figs.7,16; Fauconnier and Masure, 2004, pl.43, figs.11-12. Originally Hystrichosphaeridium, subsequently (and now) Hystrichosphaeridium?. Questionable assignment: Stover and Evitt (1978, p.56) as a problematic species. Age: Albian.
Parent: Hystrichosphaeridium