Multicolor Beakworm

When remaining in shallows, this creature grew and started to live in great shoals, developing an exuberant color. Its tail and dorsal fin are longer and acquired a thorn on the tip. A pair of small paddles appeared, making its displacement in the water easier and fast. The leader of the shoal generally is the creature with the most prominence in the group (stronger and more colored). In case it dies, a substitute will be chosen and will assume the place of prominence.