Multicolor Beakworm

When remaining in shallows, this creature grew and started to live in great shoals, being developed an exuberant color. Its tail and dorsal fin had been longer and had acquired a thorn in the tip. A pair of small paddles appeared so that its displacement in the water was more easy and fast. The leader of the shoal generally is the creature of bigger prominence in the group (stronger and colored). In case that it dies, a substitute will be chosen and will assume its place of prominence.