Urotrygonidae is a family of small, cartilaginous fish commonly known as round rays. These creatures have a circular or disc-shaped body, and are characterized by their thick, fleshy tails that lack a dorsal fin. If you're looking for synonyms for Urotrygonidae, there are a few other terms you might come across. Some alternate names for round rays include "round stingrays", "circular bat rays", and "circular eagle rays". Regardless of the specific term used, these fish are known for their unique body shape and their importance as a food source and popular aquarium species.