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Appendix A

Baltisphaeridium piriferum

"Baltisphaeridium piriferum" (Eisenack, 1954a, p.206-207, pl.1, figs.1a-b; text-fig.1) Downie and Sarjeant, 1965, p.94.

TYPE: Holotype: Eisenack, 1954a, pl.1, figs.1a-b.

HISTORY: NOW: Visbysphaera (Appendix A). Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly Multiplicisphaeridium (Appendix A), fourthly (and now) Visbysphaera (Appendix A).

SYNONYM(S): Taxonomic junior synonyms: Baltisphaeridium hermosum Cramer and Diez, 1968 (name not validly published), an acritarch species, according to Cramer (1970, p.148); Baltisphaeridium (now Visbysphaera) dilatispinosum Downie, 1963, an acritarch species, according to Eisenack (1965c, p.263) - however, Fensome et al. (1990, p.530) retained Baltisphaeridium (now Visbysphaera) dilatispinosum.

COMMENTS: This combination was not validly published in Downie and Sarjeant (1963, p.90), since these authors did not fully reference the basionym.

AGE: Silurian (Late Llandovery).


Infraspecific taxa:


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