Peteinosphaeridium trifurcatum subsp. trifurcatum Appendix A

subsp. trifurcatum.  Autonym.  Holotype: Eisenack, 1931, pl.4, fig.21, as Ovum hispidum subsp. trifurcatum and Eisenack, 1938a, pl.2, fig.2, lost according to Eisenack (1959, p.202).  Neotype: Eisenack, 1959, pl.17, fig.3, designated by Eisenack (1959, p.202).  Originally Hystrichosphaeridium trifurcatum subsp. trifurcatum, subsequently Baltisphaeridium trifurcatum subsp. trifurcatum (Appendix A), thirdly (and now) Peteinosphaeridium trifurcatum subsp. trifurcatum.  Nomenclatural junior synonym: Baltisphaeridium trifurcatum forma typicum Eisenack, 1959, an acritarch taxon, which has the same type.  Taxonomic junior synonym: Baltisphaeridium (subsequently Peteinosphaeridium) trifurcatum subsp. breviradiatum Eisenack, 1959, an acritarch taxon, by implication in Eisenack (1969a, p.255), who believed Baltisphaeridium trifurcatum subsp. breviradiatum to be the senior name.Peteinosphaeridium trifurcatum