polychaetes

Polychaetes are a diverse group of segmented worms found mainly in marine environments. They have many body segments, each usually equipped with bristle-like structures called chaetae, which help in movement and defense. Polychaetes can vary greatly in size, shape, and lifestyle; some burrow in sediment, others swim or live openly on the seabed. They play important roles in ocean ecosystems by helping mix and filter water, recycling nutrients, and serving as food for many larger animals. Despite their simple appearance, polychaetes exhibit remarkable adaptations to their diverse habitats in the ocean.