Novel gene re-arrangement in the mitochondrial genome of Pisidia serratifrons (Anomura, Galatheoidea, Porcellanidae) and phylogenetic associations in Anomura

Abstract

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. Compared with the pancrustacean 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 re-arrangements. The phylogenetic results showed that all Porcellanidae species clustered together as a group with well nodal support. Most Anomura superfamilies were found to be monophyletic, except Paguroidea. Divergence time estimation implies that the age of Anomura is over 225 MYA, dating back to at least the late Triassic. Most of the extant superfamilies and families arose during the late Cretaceous to early Tertiary. In general, the results obtained in this study will contribute to a better understanding of gene re-arrangements in Porcellanidae mitogenomes and provide new insights into the phylogeny of Anomura.

Characterization of the complete mitochondrial genome of Desmaulus extinctorium (Littorinimorpha, Calyptraeoidea, Calyptraeidae) and molecular phylogeny of Littorinimorpha

“…extinctorium mitogenome is comprised of A (27.73%), T (42.47%), G (18.08%), and C (11.71%), demonstrating a conspicuous AT bias. These findings parallel not only those observed in numerous mollusks [ 60 , 61 ] but also in certain crustaceans like crabs and lobsters [ 62 , 63 ]. The cumulative A + T (%) content of the mitogenomes stands at 70.20%.…”

“…certain crustaceans like crabs and lobsters [62,63]. The cumulative A + T (%) content of the mitogenomes stands at 70.20%.…”