Divergent karyotypes of the annual killifish genusNothobranchius(Cyprinodontiformes, Nothobranchiidae).
Karyotypes of two species of the African annual killifish genusNothobranchiusPeters, 1868,Nothobranchius brieniPoll, 1938 andNothobranchiussp. from Kasenga (D.R. Congo) are described. Both species displayed diploid chromosome number 2n = 49/50 for males and females respectively with multiple-sex chromosome system type X1X2Y/X1X1X2X2. The karyotypes of studied species are considerably different from those previously reported for the genusNothobranchiusand similar to the Actinopterygii conservative karyotype.
Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninsky prospect, Moscow, 119071 Russia.
Eugene
E
Krysanov
Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninsky prospect, Moscow, 119071 Russia.
Tatiana
T
Demidova
30, rue du Mont Ussy, 77300 Fontainebleau, France.
Bela
B
Nagy
Africa; Nothobranchius; chromosome number; karyotype; killifish