Hystrichosphaeridium geometricum Deflandre 1945a

"geometricum" Deflandre, 1945a, p.64–65, pl.2, figs.2–5.  Holotype: Deflandre, 1945a, pl.2, fig.2.  Junior homonym: Hystrichosphaeridium geometricum Pastiels, 1948.  NOW Striatotheca geometrica (Appendix A).  Originally Hystrichosphaeridium geometricum, subsequently Veryhachium geometricum (Appendix A), thirdly Veryhachium trispinosum subsp. geometricum (combination not validly published; Appendix A), fourthly (and now) Striatotheca geometrica (Appendix A).  Age: Middle Silurian.

Parent: Hystrichosphaeridium