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Growing evidence suggests that many vertebrate lineages are evolving atsignificantly different rates. As a first approximation of evolutionary rates,we assessed the amount of neutral (dS) and non-neutral (dN) substitutions thathave accumulated within and across sister clades since the time of theirdivergence. We found that in fish, tetraodontiformes (pufferfish) are evolvingat faster rates than cypriniformes (fresh water teleosts), while cypriniformesare evolving faster than elasmobranchs (sharks, skates and rays). A similarrate variation was observed in salamanders: plethodontidae were found to evolveat a rate nearly two fold faster than the hydromantes lineage. We discusspossible explanations for this striking variation in substitution rates amongdifferent vertebrate lineages that occupy widely diverse habitats and niches.

Slow Evolution of rag1 and pomc Genes in Vertebrates with Large Genomes