the National Key R&D Program of China(No.2018YFC0309804);the China Ocean Mineral Resources Research and Development Association Program(No.DY135-E2-3-04);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB42000000);the Biological Resources Program,Chinese Academy of Sciences(No.KFJ-BRP-017-38)。
The elpidiid holothurian Peniagone leander Pawson and Foell,1986 is recorded for the first time from the Mariana Trench area at a depth of 5571 m.The type description of this species was based on only in-situ photogra...