The Planktonic foraminifer Cassigerinella Winniana (Howe) from Southerm Australia: Comments on its lineage recognition

• Qianyu Li ^[1] ; Brian McGowran ^[1]
  1. [1] University of Adelaide

     University of Adelaide

     Australia

     
• Localización: Revista española de micropaleontología, ISSN 0556-655X, Vol. 28, Nº. 1, 1996, págs. 97-103
• Idioma: inglés
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• Resumen

  • Typical specimens of Cassigerinella winniana (Howe) from southern Australia show two distinct stages of growth: a uniserially planispiral early stage and a biserially enrolled later stage. These features repudiate a recent speculation among some specialists that the species was derived from the biserial chiloguembelinids. Instead, this evidence supports the classical view that the planispiral pseudohastigerinids were likely its ancestor. A probable evolutionary relationship between Pseudohastigerina micra, Cassigerinella winniana and Praetenuitella insolita is discussed.