Polychaetes
Polychaetes (pronounced: /ˈpɒlɪkiːts/), also known as bristle worms, are a class of Annelid worms, generally marine.
Etymology
The term "Polychaete" is derived from the Greek words "poly" meaning 'many' and "chaeta" meaning 'long hair'.
Description
Polychaetes are characterized by their numerous chaetae, or bristles, which are made of chitin. They are known for their well-developed head region, which often includes eyes, antennae, and sensory palps. The body of a polychaete is divided into many similar segments, each of which bears a pair of parapodia, or fleshy protrusions, used for locomotion and respiration.
Classification
Polychaetes are classified under the phylum Annelida, which also includes earthworms and leeches. However, polychaetes are unique in their marine habitat and distinct body structure. They are further divided into many families, including the Nereididae, Serpulidae, and Sabellidae, among others.
Ecology
Polychaetes play a significant role in the marine ecosystem. They are found in a variety of habitats, from tidal zones to deep-sea regions. Many species are benthic, living on the seafloor, while others are free-swimming. They are often important prey for larger marine animals and contribute to the breakdown and recycling of organic materials.
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