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Since its discovery of the living fossil in 1938, the coelacanth (Latimeriachalumnae) has generally been considered to be the closest living relative ofthe land vertebrates, and this is still the prevailing opinion in most generalbiology textbooks. However, the origin of tetrapods has been the subject ofintense debate for decades. The three principal hypothesis (lungfish-tetrapod,coelacanth-tetrapod, or lungfish-coelacanth sister group) have been proposed.We used the maximum gene-support tree approach to analyze 43 nuclear genesencoding amino acid residues, and compared the results of concatenation andmajority-rule tree approaches. The results inferred with three commonphylogenetic methods and three genome-scale approaches consistently rejectedthe hypothesis that the coelacanth is the closest living relative of tetrapods.

The hypothesis that coelacanth is the closest living relative of tetrapods 3 was rejected based on three genome-scale approaches