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Baltisphaeridium plicatum
Baltisphaeridium plicatum, (Maier, 1959), Downie and Sarjeant, 1965
Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium.
Tax. sr. synonym of Hystrichosphaera ramosa var. gracilis (now Spiniferites ramosus ssp. gracilis) Davey and Williams, 1966, 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. This combination was not validly published in Downie and Sarjeant, 1963 since these authors did not fully reference the basionym.
Holotype: Maier, 1959, pl.33 fig.1
Age: Middle Oligocene
Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium.
Tax. sr. synonym of Hystrichosphaera ramosa var. gracilis (now Spiniferites ramosus ssp. gracilis) Davey and Williams, 1966, 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. This combination was not validly published in Downie and Sarjeant, 1963 since these authors did not fully reference the basionym.
Holotype: Maier, 1959, pl.33 fig.1
Age: Middle Oligocene