Swarm blob (
Figurus grex)
A small, green-colored blob. While it's even dumbed than its other kin, it has one unique trait - it is capable of regenerating itself, and when cut in half (or more) it will create two (or more) new swarm blobs, resulting in large swarms of the blob wandering on the seafloor.
Reproduction: It lets out male cells in the current, and growths grow on other blobs when they land. These growths fall off and become another blob.
Movement: It creates ammonia from the nearby water and stores it in special sacks that allow it to ascend and descend and be picked up by the current. It can move on its own, and is very proficient at doing so. The young don't have their ammonia sacks fully developed and thus remain stationary in reefs, along with certain mature hindenblobs. Should the need arise, it can also rapidly release the stored ammonia to gain a speed boost to escape, but its negligible reaction time makes this ability rarely successful.
Eating: It absorbs cells and small blobs that are digested inside their guts. The waste is then released into the water the same way it went in.
Predation: It feeds on small blobs and cells, but otherwise is a peaceful species. It is however able to take on larger prey when multiple blobs (of which there are always many) take on one creature.
Competition: While the swarm blob continues to spread over large territories and be safe from most ordinary predators, certain more exotic species are appearing in the area and they don't look like blobs anymore - the protofish has opaque flesh and fins, which make it very swift and dangerous for the swarm blobs due to its sharp fangs, which while are not dangerous on their own, the protofish can "empower" them with electricity that it creates through reactions in its body, able to kill most swarm blobs with ease and preventing them from splitting. The protofish has driven almost all other blobs to extinction, leaving the swarm blob one of the last such species. In addition, green, immobile of plant-like creature species begin to cover the area above the water, being the first to move out of the watery environment.
The world is changing and the water will soon stop being the only suitable environment.
Environment: The shallow seafloor has quickly turned into a tight trait, a river of sorts. On both sides, plant-like species begin to absorb the gases like carbon dioxide and turn them into a byproduct of their feeding - oxygen. Other basic lifeforms start to emerge from the water as well, but most of the life is still aquatic.
(Swarm blobs shown in purple, protofish shown in orange, protoplants shown in green. Other species shown in red and turquoise.)