In a mammal-free ocean, after an extinction event, reptiles filled the void. This world showcases massive marine crocodiles, snakes, and turtles that occupied different niches. Alisaur - With the open waters spotless, the American alligator gradually expanded into the habitat, becoming truly aquatic. It adapted with born young, generated body heat, and large sizes at maturity. Evolving functional flukes, smoothed scales, and water filtration systems, they became the apex predators of the biosphere. They also opportunistically feed on any edible prey they swim across in pelagic waters. Elephant Sea Turtle - Even though leatherback sea turtles were already present, the sudden release of mammalian pressure resulted in adaptive radiation towards megafaunal scales. They developed true endothermy, only come ashore to lay eggs, and reach colossal sizes. The animals are generalistic omnivores that consume algae, hard, and soft prey. Such reptiles also evolved blubber-like skin, expansive flippers, and sufficient salt-filtering systems. Sea Serpant - Without cetaceans and pinnipeds patrolling the local waters, the fully aquatic Carolina black swamp snake was able to slide right into the ecosystem and undergo gigantism. They do not lay eggs, never go on land, and are warm-blooded. They evolved to ambush, burrow, and swim near substrate after benthic prey. They also possess filtration systems, laterally-compressed bodies, and paddled tails for aquatic life.
Credits: Ali~Saor (On YouTube) Sprite Work: Ceres4S2D1 Sounds: Scratch
