[4] Among Psychropotidae, Benthodytes (synonym Benthodites) are characterized by "soft retractile tentacles, circum-oral or post-oral papillae and the absence of an unpaired dorsal appendage.

[6][7] Identification of distinct species is most often based on photography, since the delicate anatomy of the sea cucumbers is often damaged in the process of sampling.

[6] Genome sequencing technology is paving the way for more accurate accounts of the evolution and taxonomy of Benthodytes species, starting with B. rosea and B.

[8] Additionally, the mitochondrial genome of B. marianensis has been sequenced and was found to contain a novel gene arrangement among holothurians that could be an adaptation allowing for survival at great depths.

[10] This list is subject to change as phylogenetic data clarifies the relationships among difficult-to-identify creatures whose soft appendages are often lost in the process of sample collection.