Vesicomyid Fauna in the Chishima (Kurile) Trench: Occurrences of a New Taxon and Calyptogena extenta

Abstract

The HOV Shinkai 6500 discovered four species of the bivalve family Vesicomyidae, namely Calyptogena (Ectenagena) phaseoliformis, C. (E.) extenta, C. (E.) sp. and C. (Archivesica) laubieri kurilensis n. subsp. in the southern extremity of the Chishima (Kurile) Trench. The morphological identifications of all species were corroborated by molecular analyses of symbiotic bacterial 16S rRNA genes and mitochondrial cytochrome c oxidase subunit I (COI) genes.