Oligosphaeridium reniforme

"reniforme" (Tasch in Tasch et al., 1964, p.193, pl.2, fig.6) Davey, 1969a, p.148.  Holotype: Tasch et al., 1964, pl.2, fig.6.  Originally Hystrichosphaeridium, subsequently Oligosphaeridium.  Taxonomic senior synonym: Hystrichosphaeridium (now Oligosphaeridium) albertense, by implication in Stover and Evitt (1978, p.69), who considered Hystrichosphaeridium reniforme to be a taxonomic junior synonym of Hystrichosphaeridium (subsequently Oligosphaeridium) irregulare, which is now a taxonomic junior synonym of Hystrichosphaeridium (now Oligosphaeridium) albertense.  This combination was not validly published in Davey and Williams (1966b, p.77), since these authors did not fully reference the basionym.  Fauconnier and Cornu in Fauconnier and Masure (2004, p.404) listed this as a problematic species but apparently accepted the synonymy cited above.  Age: Albian.

Parent: Oligosphaeridium