Striatotheca geometrica (Deflandre, 1945a, p.64–65, pl.2, figs.2–5) Sarjeant and Stancliffe, 1994, p.46.

Originally Hystrichosphaeridium geometricum, subsequently Veryhachium geometricum (Acritarch), thirdly Veryhachium trispinosum subsp. geometricum (combination not validly published, Acritarch), fourthly (and now) Striatotheca geometrica.

Holotype: Deflandre, 1945a, pl.2, fig.2.
Age: Middle Silurian.