Hystrichosphaeridium trisulcum

"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