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Hystrichosphaeridium plicatum
Hystrichosphaeridium plicatum Maier, 1959
Now Baltisphaeridium. Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium.
Tax. sr. synonym of Spiniferites ramosus ssp. gracilis (Davey and Williams, 1966) Lentin and Williams, 1973, according to Sarjeant, 1983, who noted that Spiniferites ramosus ssp. gracilis must be retained, since a taxon does not have priority outside its own rank.
Lentin and Williams, 1981, noted that the holotype appears to be related to Achomosphaera Evitt, 1963 and Spiniferites Mantell, 1850.
Holotype: Maier, 1959, pl.33, fig.1
Age: middle Oligocene
Now Baltisphaeridium. Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium.
Tax. sr. synonym of Spiniferites ramosus ssp. gracilis (Davey and Williams, 1966) Lentin and Williams, 1973, according to Sarjeant, 1983, who noted that Spiniferites ramosus ssp. gracilis must be retained, since a taxon does not have priority outside its own rank.
Lentin and Williams, 1981, noted that the holotype appears to be related to Achomosphaera Evitt, 1963 and Spiniferites Mantell, 1850.
Holotype: Maier, 1959, pl.33, fig.1
Age: middle Oligocene