Phylogenetic tree of the Arthropoda, including Myriapoda, Hexapoda, Crustacea and Chelicerata and outgroups reconstructed based on protein-coding genes from mtDNA genomes. Each group of four numbers indicates node confidence values (from top left): Bayesian posterior probabilities in percent (BPP) in amino acid and nucleotide datasets; maximum likelihood bootstrapping values (MLBP) in amino acid and nucleotide datasets.