Pterodinium crassimuratum
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"crassimuratum" (Davey and Williams, 1966a, p.39, pl.1, fig.11) Thurow et al., 1988, p.624. Holotype: Davey and Williams, 1966a, pl.1, fig.11. Originally Hystrichosphaera, subsequently Spiniferites, thirdly Pterodinium. Taxonomic senior synonym: Cymatiosphaera (as Spiniferites?, now Pterodinium) pterota, according to Kjellström (1973, p.44) and Pavlishina (1990, p.95). Taxonomic junior synonym (at specific rank): Hystrichosphaera cingulata var. polygonalis, according to Clarke et al. (1968, p.181) - however, Paul et al. (1994, p.722) retained Hystrichosphaera cingulata var. polygonalis (as Pterodinium cingulatum subsp. polygonale). Age: Cenomanian.
