Hystrichosphaeridium irregulare Merrill 1895

"?irregulare" (Merrill, 1895, p.16; text-fig.14) Sarjeant, 1964b, p.175.  Holotype: Merrill, 1895, text-fig.14.  Combination illegitimate — senior homonym: Hystrichosphaeridium irregulare Pocock, 1962.  Substitute name: Hystrichosphaeridium speciale.  Originally Geodia? irregularis (Appendix A), subsequently Hystrichosphaeridium irregulare (combination illegitimate), thirdly Hystrichosphaeridium? irregulare (combination illegitimate), fourthly Hystrichosphaeridium speciale.  Questionable assignment: Stover and Evitt (1978, p.56) as a problematic species.  Taxonomic senior synonym: Xanthidium tubiferum var. complex (now Oligosphaeridium complex), according to Harker and Sarjeant in Harker et al. (1990, p.59).  Age: Early Cretaceous.

Parent: Hystrichosphaeridium