👉 Sclerocrinidae are a group of crustaceans that belong to the class Chondrichthyes, specifically the sponges. These invertebrates have an excretory system consisting of specialized organs called sclerae, which includes the spongy tissue known as sclerenchyma. Sclerocrinidae are commonly found in marine environments and can be found in various habitats including coral reefs, seagrass beds, and mangrove swamps.