ARPHA Preprints, doi: 10.3897/arphapreprints.e70999
New psychropotid species (Echinodermata Holothuroidea Elasipodida) of the Western Pacific with phylogenetic analyses
expand article infoChuan Yu, Dongsheng Zhang, Ruiyan Zhang§, Chunsheng Wang|
‡ Key Laboratory of marine ecosystem and biogeochemical of the State Oceanic Administration, State Oceanic Administration, Second Institute of marine research, Hangzhou, China., Hangzhou, China§ Shanghai Jiao Tong University, Shanghai, China| SIOSOA, Hangzhou, China
Open Access

Holothurians of the family Psychropotidae are widely distributed, but remain least studied deep-sea holothurians. On an expedition in the Western Pacific, six psychropotid specimens were collected by the Jiaolong human operated vehicle (HOV). Through morphological examination, four of them were identified as a new species, Benthodytes jiaolongi sp. nov., which was characterized as having minute papillae, narrow brims, and terminal anus; the ossicles were either rods or primary crosses. The remaining two specimens were identified as Psychropotes verrucicaudatus Xiao, Gong, Kou & Li, 2019, which was first recorded at the Kyushu-Palau Ridge. The phylogenetic analysis confirmed the classification status of B. jiaolongi and P. verrucicaudatus, and indicated a paraphyletic relationship within the genus Benthodytes. The new species clustered with Benthodytes sanguinolenta and was separated from the clade containing the other Benthodytes species.

Benthodytes, holothurians, new record, paraphyletic group, Psychropotes, Western Pacific