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HALYSIS HØEG, 1932-AN ORDOVICIAN CORALLINE RED ALGA?
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ABSTRACT-
The systematic position of the Ordovician calcareous microfossil Halysis Høeg, 1932 has long been uncertain. Only known from thin sections, its morphology has been suggested to be either a single chain of cells or a series of tubes and it has been regarded as a green alga or cyanobacterium. Here we propose that Halysis represents a single sheet of cells. This new morphological interpretation accounts for Halysis's appearance in thin section as an extended flexuous series of ...
