Praecalcisphaerula
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PRAECALCISPHAERULA Trejo, 1983, p.5. Calcareous dinoflagellate genus (see Elbrächter et al., 2008, p.1301, who noted that the cyst wall is pithonelloid and so a dinoflagellate affinity is questionable). Type: Trejo, 1983, pl.21, fig.3, as Praecalcisphaerula primula.
Species List: