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Palaeocystodinium rhomboides
Palaeocystodinium? rhomboides (O. Wetzel, 1933) Lentin and Williams, 1973
Originally Ceratium cf. fusus forma rhomboides, subsequently (and now) Palaeocystodonium? rhomboides. At the time of the transfer, Lentin and Williams, 1973 elevated Ceratium cf. fusus forma rhomboides to the species level in order to remove fossil forms from Ceratium fusus (Ehrenberg, 1833) Dujardin, 1841 and questionably included the taxon in Palaeocystodinium. The assignment of these forms to Ceratium fusus had previously been questioned by Eisenack, 1961 and Evitt, 1961
Holotype: O. Wetzel, 1933, pl.2, fig.17
Age: Senonian
Originally Ceratium cf. fusus forma rhomboides, subsequently (and now) Palaeocystodonium? rhomboides. At the time of the transfer, Lentin and Williams, 1973 elevated Ceratium cf. fusus forma rhomboides to the species level in order to remove fossil forms from Ceratium fusus (Ehrenberg, 1833) Dujardin, 1841 and questionably included the taxon in Palaeocystodinium. The assignment of these forms to Ceratium fusus had previously been questioned by Eisenack, 1961 and Evitt, 1961
Holotype: O. Wetzel, 1933, pl.2, fig.17
Age: Senonian