Hystrichosphaeridium pachydermum

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"?pachydermum" Cookson and Eisenack, 1960b, p.251-252, pl.38, fig.5; text-fig.5.  Holotype: Cookson and Eisenack, 1960b, pl.38, fig.5; Fauconnier and Masure, 2004, pl.48, fig.10.  NOW Impletosphaeridium.  Originally Hystrichosphaeridium, subsequently Polysphaeridium, thirdly Hystrichosphaeridium?, fourthly Dapsilidinium, fifthly (and now) Impletosphaeridium.  Questionable assignment: Stover and Evitt (1978, p.56) as a problematic species.  Age: Oxfordian-Tithonian.

Parent: Hystrichosphaeridium