Isthmocystis distincta
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*distincta Duxbury, 1979a, p.201, pl.1, figs.1-6; pl.2, fig.8; text-figs.3A-B,4. Holotype: Duxbury, 1979a, pl.1, figs.1-2; text-fig.4; Fensome et al., 1993a, figs.1-2,7 - p.1133. Age: Valanginian.