Pelagothuriidae

Pelagothuriidae is a family of deep-sea swimming Sea cucumber. Members of this family are morphologically distinct from other sea cucumbers, possessing numerous appendages such as conical papillae and leaf-like tentacles. Most members of the order inhabit deep-sea environments, including species such as Enypniastes, and are benthopelagic, living in the water column just above the sea floor.

Enypniastes is a genus of deep-sea sea cucumber. It is monotypic, being represented by the single species Enypniastes eximia. Due to its unique appearance, the species has been dubbed the headless chicken fish, headless chicken monster, and the Spanish dancer. It is also known as the swimming sea cucumber, and some are called the pink see-through fantasia.

Pelagothuria is a genus of sea cucumber in the family Pelagothuriidae. It is monotypic, being represented by the single species Pelagothuria natatrix.