摘要

Bathyacmaea lactea new species, collected from a methane seep area in the South China Sea, is described and illustrated, as the sixth species of the genus Bathyacmaea Okutani, Tsuchida and Fujikura, 1992. The generic assignment is primarily based on radula morphology, which has a formula of 0-1-0-1-0 and each lateral teeth consists of three cusps. The new species resembles Bathyacmaea jonassoni Beck, 1996, Bathyacmaea tertia Sasaki, Okutani, and Fujikura, 2003, and Bathyacmaea secunda Okutani, Fujikura and Sasaki, 1993 in having relatively smooth shell sculpture, but differs from those species by its much thicker shell, strongly chipped aperture margin forming denticle-like structures, and radular morphology.