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

Originally Hystrichosphaeridium brevispinosum, subsequently (and now) Baltisphaeridium brevispinosum; see also Ovum hispidum ssp. brevispinosum (name not validly published) and Buedingiisphaeridium brevispinosum (an acritarch species; combination not validly published). The combination Baltisphaeridium brevispinosum was not validly published in Eisenack, 1958 since that author did not fully reference the basionym.

Holotype: Eisenack, 1931, pl.5, fig.3 (as Ovum hispidum ssp. brevispinosum); lost, according to Eisenack, 1959
Neotype: Eisenack, 1959, pl.15, fig.13; designated by Eisenack, 1959
Age: Silurian