Annelida
Annelida
Annelida (pronounced: /æˈnɛlɪdə/) is a large phylum of segmented worms, with over 22,000 extant species including ragworms, earthworms, and leeches. The term "Annelida" comes from the Latin word "annelus" which means "little ring", referring to the ring-like segments found in the bodies of these organisms.
Etymology
The term "Annelida" is derived from the Latin word "annelus" which means "little ring". This is in reference to the ring-like segments that make up the bodies of these organisms.
Characteristics
Annelids are characterized by their segmented bodies which are divided both internally and externally. This segmentation is a key characteristic of the phylum and is often used in the identification and classification of species. Annelids also possess a well-developed coelom, a fluid-filled body cavity that houses the internal organs.
Classification
Annelids are typically classified into three main classes: Polychaeta, Oligochaeta, and Hirudinea. Polychaetes are mostly marine and are characterized by their numerous bristles or chaetae. Oligochaetes, which include earthworms, have fewer chaetae and are typically found in terrestrial or freshwater environments. Hirudinea includes leeches, which are primarily freshwater organisms known for their parasitic or predatory lifestyles.
Related Terms
- Polychaeta: A class of annelids that are mostly marine and are characterized by their numerous bristles or chaetae.
- Oligochaeta: A class of annelids that includes earthworms and are typically found in terrestrial or freshwater environments.
- Hirudinea: A class of annelids that includes leeches, which are primarily freshwater organisms known for their parasitic or predatory lifestyles.
- Coelom: A fluid-filled body cavity that houses the internal organs of annelids.
External links
- Medical encyclopedia article on Annelida
- Wikipedia's article - Annelida
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