Calyptosporites sp.A Mort.& Chal.,1972
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| original | Eifelian | Givetian | Scotland(Orkney) | Marshall,J.E.A. Rhabdosporites langii, Geminospora lemurata and Contagisporites optivus: An origin for Heterospory within the Progymnosperms | 1996 |