Hystrichosphaeridium duplum
"duplum" Lentin and Williams, 1989, p.181. Holotype: White, 1842, pl.4, fig.12. Name illegitimate - nomenclatural senior synonym: Xanthidium tubiferum var. recurvatum (now Hystrichosphaeridium recurvatum). Originally Xanthidium tubiferum var. palmatum (Appendix A), subsequently Xanthidium palmatum (Appendix A), thirdly Spiniferites palmatus, fourthly Cordosphaeridium palmatum, fifthly Hystrichosphaeridium palmatum (combination illegitimate), sixthly Hystrichosphaeridium duplum (name illegitimate). Substitute name for Hystrichosphaeridium palmatum (White, 1842, p.39-40, pl.4, fig.12) Downie and Sarjeant, 1965, p.121 (an illegitimate name). Nomenclatural junior synonym (at specific rank): Xanthidium tubiferum var. palmaforme, which has the same holotype. See Hystrichosphaeridium recurvatum for a full discussion. Age: Senonian.
Parent: Hystrichosphaeridium
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