Impletosphaeridium varispinosum
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varispinosum (Sarjeant, 1959, p.338–340, pl.13, fig.7; text-fig.6) Islam, 1993, p.87. Holotype: Sarjeant, 1959, pl.13, fig.7; text-fig.6; Fauconnier and Masure, 2004, pl.49, fig.8. Originally Baltisphaeridium (Appendix A), subsequently Tenua Eisenack, thirdly Sentusidinium, fourthly Sentusidinium?, fifthly Cleistosphaeridium, sixthly (and now) Impletosphaeridium. Age: early Callovian.
