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Hystrichosphaeridium geometricum
Hystrichosphaeridium geometricum Deflandre, 1945
Junior homonym: Hystrichosphaeridium geometricum Pastiels, 1948.
NOW Striatotheca geometrica (Acritarch). Originally Hystrichosphaeridium geometricum, subsequently Veryhachium geometricum (Acritarch), thirdly Veryhachium trispinosum subsp. geometricum (combination not validly published; Acritarch), fourthly (and now) Striatotheca geometrica (Acritarch).
Holotype: Deflandre, 1945, pl.2, fig.2
Age: Middle Silurian
Junior homonym: Hystrichosphaeridium geometricum Pastiels, 1948.
NOW Striatotheca geometrica (Acritarch). Originally Hystrichosphaeridium geometricum, subsequently Veryhachium geometricum (Acritarch), thirdly Veryhachium trispinosum subsp. geometricum (combination not validly published; Acritarch), fourthly (and now) Striatotheca geometrica (Acritarch).
Holotype: Deflandre, 1945, pl.2, fig.2
Age: Middle Silurian