Civitoslontus communis
This descendant of Suboslontus angelosis has come up with a handy technique for avoiding predation- safety in numbers. Suboslontus communis can be found in the hundreds, with those at the back following those at the front in large schools. Schools that exceed one thousand individuals will split up into two with half of the school following one leader and the other half following the other. The leader, with nobody to follow, swims purely by instinct and searches for food sources, depended on by everyone else. Individuals usually grow no larger than 12 centimeters in length.
Re-adapting to aquatic life, Suboslontus communis has reverted its limbs back into fins, well-shaped for gliding, and has started forming a vertical tail fluke out of hardened membranes. This has been selected for as it allows Suboslontus communis additional propel with its tail, swimming more quickly with energy efficiency.
Suboslontus communis feeds off of tiny food scraps and plant matter in the middle of the ocean. Microbes are also consumed by their open mouths, but do not make a huge portion of the diet. If a large creature dies in Zone 3, schools that detect the carcass may swarm around it and eat some of the meat before being chased off by larger predators.
Suboslontus communis will mate with a random partner of the opposite sex once a month. Females will lay batches of 75-100 eggs in the nooks and crannies provided by rocks and pebbles before the school moves on again.