Description: Xenoturbella japonica holotype female. The white arrowhead indicates the ring furrow. Date: 24 December 2017, 14:26:07. Source: (2017). "A new species of Xenoturbella from the western Pacific Ocean and the evolution of Xenoturbella". BMC Evolutionary Biology 17 (1). DOI:10.1186/s12862-017-1080-2. Author: Hiroaki Nakano, Hideyuki Miyazawa, Akiteru Maeno, Toshihiko Shiroishi, Keiichi Kakui, Ryo Koyanagi, Miyuki Kanda, Noriyuki Satoh, Akihito Omori & Hisanori Kohtsuka.
