Figure 2
Decapod phylogenetic tree. This cladogram was inferred using the maximum-likelihood method based on Dataset I (13 mitochondrial PCGs, 10 359 nucleotide alignment). Clades are coloured according to the different infraorders. The outer colour strip in the phylogenetic tree represents the distribution of mitochondrial gene orders (MGO) in various infraorders and summarises a total of 59 different MGOs across the 246 different decapod species analysed, labelled for each infraorder in the panels below. Orange-coloured MGO labelled with ‘Gr’ refers to the pancrustacean ground pattern; other derived MGOs are numerically labelled and attached with a 2-letter infraorder prefix. MGOs that differ from the ground pattern are a result of a series of CREx-predicted gene rearrangement events: transposition (T), reversal (r), reverse transposition (rT), duplication (d), deletion (x) and tandem duplication-random loss (tdrl). Yellow- or red-coloured circles on some nodes reflect the level of uncertainty for the TreeREx reconstruction of each ancestral MGO, with red exhibiting highest level of uncertainty, yellow for mid-level and no circle for consistent reconstruction (see Babbucci, et al.42 for details). Subsequent outer rings indicate, to the best of our knowledge, the possible environments (terrestrial, freshwater, marine, vents/seeps) inhabited by each decapod species.
