Tetraploidy inProtopterus (Dipnoi)

Summary Comparative DNA values obtained by Feulgen cytophotometry for 3 species ofProtopterus, as well as karyotype analysis, show the existence of a diploid-tetraploid relationship within the genusProtopterus.Research supported by the Division of Human Genetics, K. U. Leuven, Belgium, and by the Université Nationale du Zaire, campus Kinshasa, Zaire. The Department of Human Genetics, University of Amsterdam. The Netherlands, provided laboratory facilities for cytophotometric analysis. I thank J. Bylsma, A. Debont, F. Koperdraad and H. Van den Berghe for advice, R. Ruysschaert and G. Warmoes for hospitality and technical assistance and T. Mohsen for the generous gift ofP. annectens from Senegal.