Polychaeta
Polychaeta (pronounced: /ˌpɒlɪˈkiːtə/) is a class of annelid worms, generally marine. The name "Polychaeta" is derived from the Greek words "poly" meaning "many" and "chaeta" meaning "long hair".
Etymology
The term "Polychaeta" is derived from the Greek words "poly" meaning "many" and "chaeta" meaning "long hair". This refers to the numerous bristles, or chaetae, that are typically present on each segment of the body of these worms.
Description
Polychaetes are a diverse group of annelid worms, with over 10,000 species described. They are primarily marine organisms, but some species can be found in freshwater or terrestrial environments. Polychaetes are characterized by their segmented bodies, each segment bearing a pair of fleshy, paddle-like appendages called parapodia, which are used for locomotion and respiration. Each parapodium has numerous chaetae, or bristles, which give the group its name.
Classification
Polychaetes are classified within the phylum Annelida, which also includes the earthworms and leeches. They are further divided into many families and genera based on characteristics such as the structure of the parapodia, the presence or absence of certain types of chaetae, and the arrangement of the segments.
Related Terms
- Annelida: The phylum to which polychaetes belong.
- Parapodium: The fleshy, paddle-like appendages found on each segment of a polychaete.
- Chaetae: The bristles found on the parapodia of polychaetes.
External links
- Medical encyclopedia article on Polychaeta
- Wikipedia's article - Polychaeta
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