Noise and biases in genomic data may underlie radically different hypotheses for the position of Iguania within Squamata
Fig 4
Systematic biases in the molecular dataset.
A. Inferred rate of evolution for each of the main clades of lizards studied. Both the median and 95% confidence intervals are represented. In the case of Iguania, the white dots also show the median values for the rate of evolution estimated individually for Acrodonta (right) and Iguanidae (left). B. Nucleotide composition of snakes and iguanians differs systematically from that of the remaining squamates. Values correspond to the average percentage of AT ± 1 standard deviation. C. Clustering of snakes and iguanians (grey dot) due to similar patterns of AT skewness. The tree represents a hierarchical clustering dendrogram, estimated using Euclidean distances of AT skewness per gene.