Polychaete
Polychaete
Polychaete (pronounced: /ˈpɒlɪkiːt/), from the Greek words poly meaning "many" and chaite meaning "hair", is a class of annelid worms, generally marine.
Etymology
The term "Polychaete" is derived from the Greek words poly (πολύς) meaning "many" and chaite (χαίτη) meaning "long hair". This refers to the numerous bristle-like structures, called chaetae, found along the body of these worms.
Description
Polychaetes are characterized by well-developed head structures and a body divided into many segments, each bearing a pair of paddle-like and highly vascularized parapodia for locomotion and respiration. The body also has numerous chaetae, which are chitinous, bristle-like structures.
Classification
Polychaetes belong to the phylum Annelida, which also includes earthworms and leeches. They are further divided into many families, including the Nereididae, Serpulidae, and Sabellidae, among others.
Habitat and Distribution
Polychaetes are predominantly marine animals and can be found in a variety of habitats, from tidal zones to deep-sea regions. Some species are known to inhabit freshwater and terrestrial environments.
Related Terms
- Annelida: The phylum to which polychaetes belong.
- Chaetae: Bristle-like structures found in polychaetes.
- Parapodia: Paddle-like structures used for locomotion and respiration in polychaetes.
- Nereididae, Serpulidae, Sabellidae: Families of polychaetes.
External links
- Medical encyclopedia article on Polychaete
- Wikipedia's article - Polychaete
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