Hystrichosphaeridium trisulcum
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"trisulcum" Deunff, 1951, p.323, caption to text-fig.3. Name not validly published: no description. Originally Hystrichosphaeridium trisculum (name not validly published), subsequently Veryhachium trisulcum (name not validly published, Appendix A), thirdly Veryhachium trisulcum (Appendix A), fourthly Veryhachium trispinosum subsp. trisulcum (combination not validly published; Appendix A). Taxonomic senior synonym: Hystrichosphaeridium (now Veryhachium) trispinosum, according to Stancliffe and Sarjeant (1994, p.233). Age: Mid Ordovician.
Parent: Hystrichosphaeridium