Hystrichosphaeridium irregulare Pocock, 1962

Originally Hystrichosphaeridium, subsequently Oligosphaeridium.
Sr. homonym of Hystrichosphaeridium irregulare (Merrill, 1895) Sarjeant, 1964.
Tax. jr. synonym of Hystrichosphaeridium (now Oligosphaeridium) albertense Pocock, 1962, according to Jansonius, 1986.
Tax. sr. synonym of Oligosphaeridium? coelenteratum (Tasch, 1964) Davey and Williams, 1969, according to Stover and Evitt, 1978.
Tax. sr. synonym of Oligosphaeridium? dispare (Tasch, 1964) Davey and Williams, 1969, according to Stover and Evitt, 1978.
Tax. sr. synonym of Oligosphaeridium reniforme (Tasch, 1964) Davey, 1969, according to Stover and Evitt, 1978.
Holotype: Pocock, 1962, pl.15, figs.228-229
Locus typicus: Imperial Virginia Hills, Canada
Stratum typicum: Barremian

Original diagnosis: Pocock, 1962, p.82
Vesicle laevigate, thin, hyaline, circular in cross section; processes trumpet shaped, hollow, usually wide, very variable in shape; lips of processes wide and irregular, serrate with serration frequently extending far down the body of the processes in a completely irregular manner; lips frequently carry short spines.
Dimensions: Holotype: Diameter of vesicle 60 µm. Length of processes 22 µm. Basal diameter of processes 8 µm. Apical diameter of processes 18 µm.