Two creatures descended from another lineage of basal tetrapods that are well adapted to manouver quickly in the water thanks to their flexible bodies and strong axial muscles, they are called Ofiacospondyli. The larger one is the Acaiaçu (Ichtiosuchus longicollum), a pursuit predator that hunts anything that fits it's mouth, but will fiercely defend it's terriotry from anything it can't eat, includig others from the same species. The smaller one is called Canduri (Humifilus vermiformis), a bottom feeder, it goes after small animals, like worms, crustaceans and sometimes even fish; they are agile but not as fast as their predator, if they get caught their skin will produce a mucus that allows them to slip throught the enemy's grip.
You are free to copy, distribute and transmit this work under the following conditions: