![]() ![]() Phylogenetic analysis based on 12 PCGs (excluding atp8) supports the monophyly of Pliocardiinae. Single base insertion in multiple sites of this location could result in new tRNA genes, suggesting a possible tRNA arising from nongeneic sequence. phaseoliformis (trnaS3), and Phreagena okutanii (trnaM2), and display high similarity to other pliocardiin sequences at the same location. Additional tRNA genes were detected between trnaG and nad2 in Abyssogena mariana (trna元), Ab. Minimal changes in gene arrangement among vesicomyid species are due to the translocation trnaG in Isorropodon fossajaponicum. Comparative analysis revealed the vesicomyid have a relatively lower ratio of Ka/Ks, and all 13 protein‐coding genes (PGCs) are under strong purifying selection with a ratio of Ka/Ks far lower than one. Gene content, base composition, and codon usage are highly conserved in these pliocardiin species. Sequence coverage is nearly complete for the three newly sequenced mt genomes, with only the control region and some tRNA genes missing. pacifica) pertaining to subfamily Pliocardinae. In this study, we analyze the features and evolutionary dynamics of mt genomes from three Archivesica species (Archivesica sp., Ar. The complete mitochondrial (mt) genomes will provide more data for comparative studies on molecular phylogeny and systematics of this taxonomically uncertain group, and help to clarify generic classifications. Plastic morphologies and present molecular data could not resolve taxonomic uncertainties. Vesicomyid clams of the subfamily Pliocardinae are among the dominant chemosymbiotic bivalves found in sulfide‐rich deep‐sea habitats.
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