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Baltisphaeridium hamatum
Baltisphaeridium hamatum, (Downie, 1958), Kjellström, 1976
Originally Hystrichosphaeridium hirsutoides var. hamatum, subsequently Baltisphaeridium hirsutoides var. hamatum (an acritarch varietas), thirdly Micrhystridium hamatum (an acritarch species), fourthly Acanthodiacrodium hamatum (an acritarch species), fifthly (and now) Baltisphaeridium hamatum. This taxon was raised to specific rank by Deflandre and Deflandre-Rigaud, 1965.
Holotype: Downie, 1958, pl.16, fig.1
Age: Early Ordovician
Originally Hystrichosphaeridium hirsutoides var. hamatum, subsequently Baltisphaeridium hirsutoides var. hamatum (an acritarch varietas), thirdly Micrhystridium hamatum (an acritarch species), fourthly Acanthodiacrodium hamatum (an acritarch species), fifthly (and now) Baltisphaeridium hamatum. This taxon was raised to specific rank by Deflandre and Deflandre-Rigaud, 1965.
Holotype: Downie, 1958, pl.16, fig.1
Age: Early Ordovician