Data from: Two complete mitochondrial genomes from Praticolella mexicana Perez, 2011 (Polygyridae) and gene order evolution in Helicoidea (Mollusca, Gastropoda)

Helicoidea is a diverse group of globally distributed land snails. While much is known regardingthe relationships of helicoid taxa, comparatively little is known about the evolution of themitochondrial genome in the superfamily. We sequenced two complete mitochondrial genomesfrom Praticolella mexicana Perez, 2011 representing the first such data from the helicoid familyPolygyridae, and used them in an evolutionary analysis of mitogenomic gene order. We foundthe mitochondrial genome of P. mexicana to be 14,008 bp in size, possessing the typical 37metazoan genes. Multiple alternate stop codons are used, as are incomplete stop codons, andmitogenome size and nucleotide content is consistent with other helicoid species. Our analysis ofgene order suggested that Helicoidea has undergone five mitochondrial rearrangements in thepast. Four rearrangements were limited to tRNA genes, including one homoplasticrearrangement in Helicidae and (Bradybaenidae+Camaena+P. mexicana). The fifthrearrangement, unique to Aegista, involved a protein coding gene.