Exochosphaeridium bifidum var. involutum
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"var. involutum" Davey, 1969c, p.29, pl.2, figs.1-3. Emendation: Marheinecke, 1992, p.52, as Exochosphaeridium bifidum subsp. involutum. Holotype: Davey, 1969c, pl.2, fig.3. NOW Exochosphaeridium bifidum subsp. involutum. Originally Exochosphaeridium bifidum var. involutum, subsequently (and now) Exochosphaeridium bifidum subsp. involutum. Age: Campanian-Maastrichtian. Parent: Exochosphaeridium bifidum