Proscylliidae

The finback catsharks, Proscylliidae, are a small family of ground sharks. The Proscyllium family falls under the Order Carcharhiniformes. They can be found in warm seas worldwide and are often the most numerous and common shark in tropical regions. They are generally less than 1 meter in length, and are slow-moving predators that feed on bony fish and small invertebrates. Although some bear live young, the majority lay eggs with almost fully developed young; these egg cases, known as "mermaid's purses", are unique in appearance to each species.