Mitogenomes Provide Insights Into the Evolution of Thoracotremata (Brachyura: Eubrachyura)

Thoracotremata is a group of Brachyura, with 1,248 extant species. To date, parts the thoracotreme phylogeny are not yet resolved and require further investigation . In this study, 12 new mitogenomes from four superfamilies were sequenced. They contain standard set 37 genes, vary in size 15,422 ( Hapalocarcinus marsupialis Stimpson, 1858 sensu lato ) to 16,490 bp [ Arcotheres sinensis (Shen, 1932)]. Combined 58 mitochondrial genomes (mitogenomes) GenBank, we described evolution gene rearrangement internal phylogenetic relationships Thoracotremata, evaluated position Cryptochiroidea Pinnotheroidea. Nine distinct patterns order (MGO) among identified, MGOs newly found Thoracotremata. All other orders result transformational pathways originating brachyuran (BraGO). The different have variable levels rearrangements, which involve both tRNAs protein-coding genes. No link between arrangements (breakpoint distances) nucleotide substitution rates (branch lengths) crabs. symbiotic groups, cryptochiroid pinnotheroid crabs, display (CryGO, Pin1GO, Pin2GO), providing evidence for possible correlations rearranged adaptations specialized lifestyles. our analyses, Cryptochiridae (Cryptochiroidea) show close relationship an Ocypodoidea lineage (Camptandriidae/Xenophthalmidae/Dotillidae). Pinnotheridae (Pinnotheroidea) form basal monophyletic clade.