Abyssal Gastropods and Bivalves Collected by Shinkai 6500 on Slope of the Japan Trench

Abstract

During recent dives by the crewed submersible Shinkai 6500 in abyssal depths on the landward slope of the Japan Trench (5343-5379 m), five gastropod and four bivalve species were collected from seep environments. The gastropods include a recently described species in the Neomphalidae, two new species in the Provannidae, a single species in the Buccinidae, and a new species in the Cancellariidae. Bivalves are represented by a single species of the Solemyidae, a single species of the Thyasiridae and two species of the Vesicomyidae, the most of which were previously described from greater depths in the same trench.