Definition: A group of amphibians that have long bodies (often with rings), no limbs, and virtually no tail. Earthworm-like in appearance. Caecilians belong to the Order Gymnophiona. They have a superficial resemblance to snakes, worms, or eels but are not closely related to any of these animals. Instead, they are more closely related to frogs, toads, and salamanders. Caecilians are vertebrates and have jaws and teeth. They are carnivores and feed on insects and other invertebrates such as worms.