Search

We report the complete mitochondrial genome (mitogenome) of the giant ramshorn snailMarisa cornuarietis, a biocontrol agent of freshwater weeds and snail vectors of schistosomes. The mitogenome is 15,923 bp in length, encoding 13 protein-coding genes, 22 transfer RNAs and 2 ribosomal RNAs. The mitogenome is A+T biased (70.0%), with 28.9% A, 41.1% T, 16.7% G, and 13.3% C. A comparison withPomacea canaliculata, the other member in the same family (Ampullariidae) with a sequenced mitogenome, shows that the two species have an identical gene order, but their intergenic regions vary substantially in sequence length. The mitogenome data can be used to understand the population genetics ofM. cornuarietis, and resolve the phylogenetic relationship of various genera in Ampullariidae. [ABSTRACT FROM PUBLISHER]

The genomic DNA of twoProvannasp. individuals was extracted, sequenced using an Illumina HiSeq1500, and the mitogenome was assembled. The nearly complete metogenome was 16,183 bp in length, consisting of 37 typical metazoan mitochondrial genes with the typical caenogastropod mitochondrial gene order. All mitochondrial genes were encoded on the heavy strand with the exception of eight transfer RNA genes. To reconstruct the phylogenetic position of the deep-sea Provannidae, we used amino acid sequences of all the 13 mitochondrial protein-coding genes in Bayesian inference, maximum likelihood, and maximum parsimony analyses with sequences of selected gastropods. The resultant phylogenetic trees supported the placement of Provannidae in the superfamily Abyssochrysoidea of the clade Littorinimorpha of Gastropoda, providing new data for understanding the phylogeny of these deep-sea snails. [ABSTRACT FROM AUTHOR]