Hystrichosphaeridium trifurcatum Eisenack, 1931, ex Eisenack, 1938

Now Peteinosphaeridium trifurcatum. Originally Hystrichosphaeridium trifurcatum, subsequently Baltisphaeridium trifurcatum, thirdly (and now) Peteinosphaeridium trifurcatum. See also Ovum hispidum ssp. trifurcatum (combination not validly published).
Tax. sr. synonym of Peteinosphaeridium bergstroemii Staplin et al., 1965, according to Eisenack, 1969.
Tax. sr. synonym of Baltisphaeridium trifurcatum ssp. breuiradiatum (al. Peteinosphaeridium breviradiatum) since it is now considered to be a jr. synonym of the autonym Hystrichosphaeridium (now Peteinosphaeridium) trifurcatum ssp. trifurcatum.

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)