Diversity of sponge mitochondrial introns revealed by cox 1 sequences of Tetillidae.

Unlike the AU tests, the likelihood ratio test does not reject the H 0 hypothesis that the one-tree hypothesis (both genes have the same topology) is favored over the two-tree model (each gene has a different topology), although marginal significance is observed ( p = 0.072; out of the 500 replications performed 36 were found to have a smaller log-likelihood ratio statistic than the original data set, Additional file 2 ).

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The fact that the reciprocal AU tests reject the hypothesis of co-phylogeny and that the LRT test is marginally significant indicates the presence of at least one incongruent node between the LAGLIDADG and cox 1 trees.

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