Shark genome size evolution and its relationship with cellular, life-history, ecological, and diversity traits.

For all the comparative analyses described in “ Comparative analysis ” section, statistical significance was set at α = 0.05 (*) [very significant at α = 0.01 (**) and highly significant at α = 0.001 (***)].

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The lack of articulated fossils, scarce due to the cartilaginous skeleton of Chondrichthyes, prevented the possibility of identifying a clear trend of evolution (unlike for lungfishes and amphibians, where the use of bone lacunae as an indirect estimate of fossil cell, and hence genome size, showed low values as the general ancestral condition 85 , 86 ).

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