The type-species of the genus Girvanella (calcareous algae)
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Topotype Ordovician material containing Girvanella problematica Nicholson and Etheridge has been studied, several species being found to occur together. The genus is redefined and the limits of variation of the type species indicated.
Citations
WOOD, A. 1957. The type-species of the genus Girvanella (calcareous algae). Palaeontology, 1, 1, 22–28.