Baltisphaeridium geometricum Appendix A

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"geometricum" (Pastiels, 1948, p.41, pl.4, figs.1–11 ex Downie and Sarjeant, 1965, p.90) Fensome et al., 1990, p.617.  Holotype: Pastiels, 1948, pl.4, fig.4.  NOW Apectodinium.  Originally Hystrichosphaeridium geometricum (name illegitimate), subsequently Baltisphaeridium geometricum, thirdly Apectodinium pastielsii (name illegitimate), fourthly (and now) Apectodinium pastielsii.  Nomenclatural junior synonym: Apectodinium pastielsii, which has the same type.  Taxonomic junior synonym (at specific rank): Wetzeliella homomorpha var. quinquelata (as Wetzeliella quinquelata; now Apectodinium quinquelatum), by implication in Harland (1979c, p.67), who believed the latter to be the senior name — however, Lentin and Williams (1989, p.18) retained Apectodinium quinquelatum.  Age: Ypresian.

Parent: Baltisphaeridium_Appendix A