Baltisphaeridium trifurcatum, (Eisenack, 1931 ex Eisenack, 1938), Eisenack, 1959

Now Peteinosphaeridium trifurcatum (an acritarch species). Originally Hystrichosphaeridium trifurcatum, subsequently Baltisphaeridium trifurcatum, thirdly (and now) Peteinosphaeridium trifurcatum (an acritarch species); see also Ovum hispidum ssp. trifurcatum (name not validly published).
Tax. sr. synonym of the acritarch species Peteinosphaeridium bergstroemii Staplin et al., 1965, according to Eisenack, 1969.
Tax. sr. synonym of the acritarch subspecies Baltisphaeridium trifurcatum ssp. breviradiatum (al. Peteinosphaeridium breviradiatum) since it is now considered to be a jr. synonym of the autonym Hystrichosphaeridium (now Peteinosphaeridium) trifurcatum ssp. trifurcatum. The combination Baltisphaeridium trifurcatum was not validly published in Eisenack, 1958 since that author did not fully reference the
basionym.

Holotype: Eisenack, 1931, pl.4, fig.21 (as Ovum hispidum ssp. trifurcatum); Eisenack, 1938, pl.2, fig.2; lost, according to Eisenack, 1959
Neotype: Eisenack, 1959, pl.17, fig.3; designated by Eisenack, 1959
Age: Ordovician (based on material from an erratic)