Peteinosphaeridium trifurcatum Appendix A

+trifurcatum (Eisenack, 1931, p.112, pl.4, figs.21-23 ex Eisenack, 1938a, p.12,16-19) Eisenack, 1969a, p.254.  Holotype: Eisenack, 1931, pl.4, fig.21, as Ovum hispidum subsp. trifurcatum; 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 Ovum hispidum subsp. trifurcatum (name not validly published, Appendix A), subsequently Hystrichosphaeridium trifurcatum, thirdly Baltisphaeridium trifurcatum (Appendix A), fourthly (and now) Peteinosphaeridium trifurcatum.  Taxonomic senior synonym: Xanthidium (now Spiniferites) ramosum, according to Wetzel (1933b, p.36) - however, the latter species is a dinoflagellate.  Taxonomic junior synonyms: Peteinosphaeridium bergstroemii Staplin et al., 1965, an acritarch species, according to Eisenack (1969a, p.254-255); Baltisphaeridium trifurcatum subsp. breviradiatum (subsequently Peteinosphaeridium breviradiatum), by implication in Eisenack (1969a, p.255), who considered Baltisphaeridium trifurcatum subsp. breviradiatum to be the senior name.  The nomenclatural type of the genus Peteinosphaeridium remains the holotype of Peteinosphaeridium bergstroemii.  The name Ovum hispidum subsp. trifurcatum was not validly published in Eisenack (1931) since the specific name Ovum hispidum was not validly published.  For further discussion see Fensome et al. (1990, p.392).  Age: Ordovician (erratic).

Parent: Peteinosphaeridium