👉 Urotrematids are a group of marine invertebrates that form the largest family within the class Urotropoda, known for their unique and specialized structures and behaviors. These invertebrate animals are characterized by a single head with multiple arms, paired gills, and a segmented body. Urotrematids play crucial roles in ecosystems through various functions such as decomposing organic matter, serving as food sources for marine organisms, and cleaning up waste products from the ocean floor.