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Sentusidinium varispinosum

Sentusidinium "?varispinosum" (Sarjeant, 1959, p.338–340, pl.13, fig.7; text-fig.6) Sarjeant and Stover, 1978, p.50.

NOW Impletosphaeridium. Originally Baltisphaeridium (acritarch), subsequently Tenua Eisenack, thirdly Sentusidinium, fourthly Sentusidinium?, fifthly Cleistosphaeridium, sixthly (and now) Impletosphaeridium. Questionable assignment: Stover and Evitt (1978, p.81).

Holotype: Sarjeant, 1959, pl.13, fig.7; text-fig.6; Fauconnier and Masure, 2004, pl.49, fig.8.
Age: early Callovian.

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