Despite this diversity, teleost fishes show a strong trend of conserved karyotypes ( Galetti et al. 2000 ; Mank and Avise 2006 ; Nakatani et al. 2007 ) with over half of all karyotyped fish species having a diploid number of 48 or 50 ( Mank and Avise 2006 ; Arai 2011 ).
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High variability in chromosome number from a clade within the gourami family (Teleostei, Osphronemidae).
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