Hystrichosphaeridium bacifer (Eisenack 1934) Eisenack 1938

NOW Bacisphaeridium (Acritarch). Originally Bion (Acritarch), subsequently Hystrichosphaeridium, thirdly Veryhachium (combination not validly published; Acritarch), fourthly (and now) Bacisphaeridium (Acritarch), fifthly Baltisphaeridium (combination not validly published; Acritarch).

Holotype: Eisenack, 1934, pl.4, fig.20 (lost according to Eisenack, 1962)
Neotype: Eisenack, 1962, pl.44, fig.3 (designated by Eisenack, 1962.
Age: Late Ordovician