As some populations of Photosorbus moved into the river systems of Dingus, they found an environment where there was plenty of organic matter to feed upon and almost nothing around to eat them. Because of this, they grew in size and transitioned into fully multicellular organisms. This lead to the evolution of the Emerald Scrimpe which is one of the first species of Radfauna(depending on if Wigglers count as Radfauna or not) to settle the water ways of Dingus. Their simple eye still helps the Emerald Scrimpe navigate as they look for food and avoid the few local predators which mostly consist of some species of Dual-Eyed Wigglers. Their two fins help them with steering while they undulate their body and four tails from side to side. The green pigment found within their cells helps them absorb light for photosynthesis, though they have also developed light amounts of a brown pigment for some camouflage to avoid the few local predators. While they do get a good amount of their energy from photosynthesis, they also will feed upon organic matter found within the sediment for extra nutrients that can help their growth. Since they lack a mouth, the Emerald Scrimpe has instead developed two lip-like protrusions that they use to place on organic matter while they release enzymes to break it down so it can then be absorbed through their skin. These two "lips" partially assist with steering alongside the fins.

When it comes to breeding, the Emerald Scrimpe now participates in sexual reproduction, with two Emerald Scrimpes having their rear ends connect so they can have one of their fours "tails" wrap around the "tail" of the other individual. Once this occurs, the two tails will fuse together and then detach, exchanging genetic information before splitting in two and developing into baby Emerald Scrimpes. This occurs will all four tails on each individuals, with the two Emerald Scrimpes eventually growing back the four tails.