Hystrichosphaeridium trifurcatum
"trifurcatum" Eisenack, 1931, p.112, pl.4, figs.21-23 ex Eisenack, 1938a, p.12,16-19. Holotype: Eisenack, 1931, pl.4, fig.21, as Ovum hispidum subsp. trifurcatum (Appendix A); 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). NOW Peteinosphaeridium trifurcatum (Appendix A). Originally Ovum hispidum subsp. trifurcatum (combination not validly published; Appendix A), subsequently Hystrichosphaeridium trifurcatum, thirdly Baltisphaeridium trifurcatum (Appendix A), fourthly (and now) Peteinosphaeridium trifurcatum (Appendix A). Taxonomic junior synonyms: Peteinosphaeridium bergstroemii Staplin et al., 1965, an acritarch species, according to Eisenack (1969b, p.254-255); Baltisphaeridium trifurcatum subsp. breviradiatum (subsequently Peteinosphaeridium breviradiatum), by implication in Eisenack (1969a, p.255), who considered Baltisphaeridium trifurcatum subsp. breviradiatum to have priority over Baltisphaeridium trifurcatum subsp. trifurcatum. The name Ovum hispidum subsp. trifurcatum was not validly published in Eisenack (1931) since the specific name Ovum hispidum was not validly published. Age: Ordovician (erratic).
Parent: Hystrichosphaeridium
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