Geodia irregularis Appendix A
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"?irregularis" Merrill, 1895, p.16; text-fig.4. Holotype: Merrill, 1895, text-fig.4. Originally Geodia? irregularis, subsequently Hystrichosphaeridium irregulare (combination illegitimate), thirdly Hystrichosphaeridium? irregulare (combination illegitimate), fourthly Hystrichosphaeridium speciale. Questionable assignment: Merrill (1895, p.16). Taxonomic senior synonym (at specific rank): Xanthidium tubiferum var. complex (now Oligosphaeridium complex), according to Harker and Sarjeant in Harker et al. (1990, p.59). Age: Early Cretaceous.
Parent: Geodia
