A small, luminescent scavenger, roughly thumb-sized. This creature may be a distant relative of the sand shark, sharing that species' unusual limbs, segmented exoskeleton and burrowing behavior.
1. Jaw: Its circular set of teeth is designed to tear up clumps of coral and sea grass caught on the rocks.
2. Limbs: Five legs, two arms and a large flipper allow the rockgrub to cling to and walk across rock faces in search of food, and swiftly swim to safety when under attack.
3. Green Luminescence: Glowing green in the dark would seem like a poor survival strategy, but this adaptation may be a mating behavior or other specialized process, engaged in by only a fraction of the total population at any one time. Or perhaps being eaten is simply part of the rockgrub's lifecycle.
Assessment: Harmless