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Appendix A

Baltisphaeridium heteracanthum

"Baltisphaeridium heteracanthum" (Deflandre and Cookson, 1955, p.276, pl.2, figs.5-6; text-figs.40-41) Downie and Sarjeant, 1965, p.91.

TYPE: Holotype: Deflandre and Cookson, 1955, pl.2, fig.5.

HISTORY: NOW: Heterosphaeridium?. Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly Cleistosphaeridium, fourthly Heterosphaeridium, fifthly (and now) Heterosphaeridium?.

COMMENTS: This combination was not validly published in Downie and Sarjeant (1963, p.91), since these authors did not fully reference the basionym.

AGE: ?Late Cretaceous-Early Eocene.


Infraspecific taxa:


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