Novel gene rearrangement in the mitochondrial genome of Pisidia serratifrons (Anomura: Galatheoidea: Porcellanidae) and phylogenetic associations in Anomura

To improve the taxonomy and systematics of Porcellanidae within the evolution of Anomura, we describe the complete mitochondrial genomes (mitogenomes) sequence of Pisidia serratifrons, which is 15,344 bp in size, contains the entire set of 37 genes, and has an AT-rich region. The genome composition showed a high AT content of the mitogenomes was 74.29%, and exhibited a positive AT-skew (0.017) and a negative GC-skew (-0.246). Compared with the pan-crustacean ground pattern, at least five gene clusters (or genes) are significantly different with the typical genes, involving eleven tRNA genes and four PCGs, and the tandem duplication/random loss and recombination models were used to explain the observed large-scale gene rearrangements. The phylogenetic results showed that all Porcellanidae species clustered together as a group with well supported. Most Anomura superfamilies were found to be monophyletic, except Paguroidea. In general, the results obtained in this study will contribute to a better understanding of gene rearrangements in Porcellanidae mitogenomes and provide new insights into the phylogeny of Anomura.