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Visbysphaera micrispinosa
Visbysphaera microspinosa (Eisenack, 1954) Lister, 1970
Originally Hystrichosphaeridium, subsequently Baltisphaeridium (an acritarch
genus), thirdly Lophosphaeridium (an acritarch genus), fourthly (and now) Visbysphaera; see also Buedingiisphaeridium (an acritarch genus; combination not
validly published). Eisenack et al., 1973 retained this species in the acritarch genus Baltisphaeridium Eisenack, 1958 ex Eisenack, 1959; however, Priewalder, 1987 retained it in Visbysphaera.
Holotype: Eisenack, 1954, pl.1, fig.8
Age: Silurian (Late Llandovery)
Originally Hystrichosphaeridium, subsequently Baltisphaeridium (an acritarch
genus), thirdly Lophosphaeridium (an acritarch genus), fourthly (and now) Visbysphaera; see also Buedingiisphaeridium (an acritarch genus; combination not
validly published). Eisenack et al., 1973 retained this species in the acritarch genus Baltisphaeridium Eisenack, 1958 ex Eisenack, 1959; however, Priewalder, 1987 retained it in Visbysphaera.
Holotype: Eisenack, 1954, pl.1, fig.8
Age: Silurian (Late Llandovery)