Discovery of a Deep-Sea Limpet at Nearly 6 Kilometers Below the Pacific Surface

In the summer of 2025, scientists from the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) conducted a deep-sea expedition 500 kilometers southeast of Tokyo using the crewed submersible Shinkai 6500. At a depth of 5,922 meters, they discovered a living limpet, later named Bathylepeta wadatsumi, marking the deepest-living true limpet ever recorded. Unlike the small tidal limpets commonly known, this species measures 40.5 millimeters in shell length, making it unusually large for its environment. The name 'wadatsumi' references both a Japanese sea god and a manga character from One Piece. Living on volcanic rock, the limpet feeds on thin sediment layers that contain organic material, playing a key role in carbon cycling in the nutrient-poor abyssal environment. The discovery highlights the advantage of crewed submersibles, where human observation allows nuanced recognition of life forms that might be missed by remotely operated vehicles. This finding expands our understanding of deep-sea biodiversity and underscores the ecological significance of specialized species in extreme habitats.