Hystrichosphaerina exilimura
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"?exilimura" (Davey and Williams, 1966b, p.87, pl.11, fig.2) Sarjeant, 1981, p.122. Holotype: Davey and Williams, 1966b, pl.11, fig.2; Bujak et al., 1980, pl.7, figs.4–5. Originally Cordosphaeridium, subsequently Hystrichosphaerina?, thirdly Tityrosphaeridium?. Questionable assignment: Sarjeant (1981, p.122). Taxonomic senior synonym: Cordosphaeridium fibrospinosum, according to Fensome et al. (2009, p.23). Taxonomic junior synonym: Achomosphaera (subsequently Cordosphaeridium) valianta, according to Jain (1982, p.52). Age: early Eocene.
Parent: Hystrichosphaerina