Lumicauda lavus
L. lavus is a small aquatic invertebrate descended from L. testucanus. After a group of L. testucanus wandered into zone 25, they decided to stay because of the open waters and high amounts of food for them. They maintain a very similar morphology to their ancestor, however on their 5th and 6th body segments they have a section of hardened exoskeleton that helps them in defense from behind. This is because a potential predator, Synacodurus spp., are generally easy to deter from the front (using their large, sharp mandibles) however they would be helpless when attacked from behind. Thus they have developed this very hard shell on this specific area in an attempt to counteract that. They feed upon the polyphs present in zone 25, specifically O. kerensis and the Kelpflotensa spp. They generally use their mandibles to tear off segments of the polyph before consuming them. They still have their tail light which they still use to attract mates.
Fertilization takes place externally, with females laying their eggs on the Kelpflotensa's leaves, and males fertilizing them. Clutches consist of 10-15 eggs, with around ½-⅔ reaching adulthood.