Annelid
Annelid
Annelid (/əˈnɛlɪd/), from the Latin Annelida, meaning "little rings", is a large phylum of segmented worms, with over 22,000 modern species including ragworms, earthworms, and leeches. The term "Annelid" is derived from the Latin word annellus which means a small ring.
Etymology
The term "Annelid" is derived from the Latin word annellus which means a small ring. This is in reference to the ring-like segments that make up the bodies of these creatures.
Characteristics
Annelids are bilaterally symmetrical, triploblastic, coelomate, invertebrate organisms. They are known for their segmented body structure, which is divided internally and externally into well-defined segments. Each segment may bear setae, parapodia, and other appendages.
Classification
Annelids are classified into three major groups: Polychaeta, Oligochaeta, and Hirudinea.
- Polychaeta are marine worms with well-developed parapodia and setae.
- Oligochaeta includes earthworms and other closely related species that have a reduced number of setae.
- Hirudinea includes leeches, which are typically freshwater annelids with a sucker at each end of the body.
Related Terms
- Segmentation: The division of some animal and plant body plans into a series of repetitive segments.
- Setae: Bristle- or hair-like structures on the body of many types of invertebrates.
- Parapodia: Paired, lateral, fleshy protrusions on the segments of polychaete annelids.
- Coelomate: An animal that has a coelom, a body cavity lined by mesoderm.
External links
- Medical encyclopedia article on Annelid
- Wikipedia's article - Annelid
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