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3 results
  • The Ordovician acritarch genera Tranvikium and Ampullula: their relationship and taxonomy. [Journal Article]
    Rev Palaeobot Palynol 2000; 112(1-3):23-38Uutela A, Sarjeant WA
  • A restudy of the Ordovician (Arenig-Llanvirn) acritarch taxa Tranvikium polygonale Tynni, 1982, and Ampullula suetica Righi, 1991, indicates that they represent extremes in a single morphological plexus. At one extreme are forms with a polar 'excystment' aperture (closed by an operculum or two opercular pieces) and a smaller opening (plugged or open) at the opposite pole; at the other are forms l…
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