![[OC] Monomysian sea cucumbers](https://preview.redd.it/ums2x42nj22h1.png?auto=webp&s=4794b0750d4403e7aec8f52c350556e56728768f)
[OC] Monomysian sea cucumbers
Monomysia, or wyvern sea cucumbers or sea dragons/wyverns, is an incredibly successful order of aquatic echinoderm descended from sea cucumbers. They possess a single muscle, derived from their ambulacral system, which compacted together into a tail muscle that can bend, stretch, and retract only with hydraulic fluids. The hydraulics near their tube feets are modified to make them prehensile, so reaching for food in a small space or grabbing specific materials are easier. a pair of light sensitive eyes derived from an extension of their photoreceptive system allows them to detect light and "see", but derivative clades enhances or reduce their sensory system for different adaptations, especially their pair of primitive eyes.