Abstract
Mitochondrial genomes have proved to be a powerful tool in resolving phylogenetic relationship. In order to understand the mitogenome characteristics and phylogenetic position of the genus Dosinia, we sequenced the complete mitochondrial genomes of Dosinia altior and Dosinia troscheli (Bivalvia: Veneridae), compared them with that of Dosinia japonica and established a phylogenetic tree for Veneridae. The mitogenomes of D. altior (17,536 bp) and D. troscheli (17,229 bp) are the two smallest in Veneridae, which include 13 protein-coding genes, 2 ribosomal RNA genes, 22 tRNA genes, and non-coding regions. The mitogenomes of the Dosinia species are similar in size, gene content, AT content, AT- and GC- skews, and gene arrangement. The phylogenetic relationships of family Veneridae were established based on 12 concatenated protein-coding genes using maximum likelihood and Bayesian analyses, which supported that Dosininae and Meretricinae have a closer relationship, with Tapetinae being the sister taxon. The information obtained in this study will contribute to further understanding of the molecular features of bivalve mitogenomes and the evolutionary history of the genus Dosinia.
Highlights
The genus Dosinia belonging to the family Veneridae in the superfamily Veneracea are important marine bivalves inhabiting from intertidal zone to subtidal zone along shallow coasts [1]
In the D. altior mitogenome, there are 22 non-coding regions with a total of 2385 bp long varying from 1 bp to 1865 bp, and the D. troscheli mitogenome contains 21 non-coding regions with a total of 2140 bp with various lengths of 2–1521 bp
Based on phylogenetic analyses of multiple protein-coding genes, we suggest that Dosinia genus would be evolutionarily closer to Meretricinae clams than Tapetinae, and support that the Dosinia is monophyletic
Summary
The genus Dosinia belonging to the family Veneridae in the superfamily Veneracea are important marine bivalves inhabiting from intertidal zone to subtidal zone along shallow coasts [1]. It was recognized as one of the significant taxons both in stratigraphy and chronology [2]. In contrast to the large number of morphological descriptions of Dosinia, there have been few attempts to perform molecular phylogenetic analysis in this genus so far [5,6,7,8,9,10].
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