Helicoidea is a diverse group of land snails with a global distribution. While much is known regarding the relationships of helicoid taxa, comparatively little is known about the evolution of the mitochondrial genome in the superfamily. We sequenced two complete mitochondrial genomes from Praticolella mexicana Perez, 2011 representing the first such data from the helicoid family Polygyridae, and used them in an evolutionary analysis of mitogenomic gene order. We found the mitochondrial genome of P. mexicana to be 14,008 bp in size, possessing the typical 37 metazoan genes. Multiple alternate stop codons are used, as are incomplete stop codons. Mitogenome size and nucleotide content is consistent with other helicoid species. Our analysis of gene order suggested that Helicoidea has undergone four mitochondrial rearrangements in the past. Two rearrangements were limited to tRNA genes only, and two involved protein coding genes.
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RLM is supported in part by faculty research and development funds and a Barrios fellowship from UHCL. MAMC and KEP would like to acknowledge UTRGV Science Education Grant #52007568 funded by the Howard Hughes Medical Institute, ADVANCE Institutional Transformation Grant (NSF# 1209210), UTRGV Faculty Research Council, and College of Sciences for financial support. This work was supported in part by the National Science Foundation (under grant HRD-1463991).
Minton, Russell L.; Cruz, Marco A. Martinez; Farman, Mark L.; and Perez, Kathryn E., "Two Complete Mitochondrial Genomes from Praticolella mexicana Perez, 2011 (Polygyridae) and Gene Order Evolution in Helicoidea (Mollusca, Gastropoda)" (2016). Plant Pathology Faculty Publications. 57.