Lophotrochozoans are a diverse group of animals within the Bilateria clade, characterized by their unique developmental stages. This group includes phyla such as Mollusca (which includes snails and octopuses) and Annelida (segmented worms). They are known for having either a lophophore, a feeding structure with tentacles, or a trochophore larval stage, which is a free-swimming form. These animals exhibit a wide range of body forms and habitats, from marine to freshwater and terrestrial environments. Lophotrochozoans play important roles in ecosystems, serving as both predators and prey, and contribute to nutrient cycling and sediment turnover in their habitats.