polychaete worm
Học thuậtThân thiện
Definition
Noun: 1. A type of marine annelid worm belonging to the class Polychaeta, characterized by having paired, fleshy appendages (parapodia) on most body segments, which bear numerous bristles (chaetae). They are primarily marine organisms and often have separate sexes.
Usage and Examples
- Noun:
- The sandy shore was teeming with polychaete worms burrowing beneath the surface.
- Scientists study the polychaete worm for its remarkable regenerative abilities.
- Many polychaete worms are important components of the marine food web.
Advanced Usage
- As a model organism: In biological research, the polychaete worm is used as a model for studying development and evolution.
- In paleontology: The fossilized jaws (scolecodonts) of ancient polychaete worms are used by scientists to date and understand past marine environments.
Variants and Related Words
- Polychaete (noun/adjective): The more common short form. (e.g., "The polychaete fauna is diverse.")
- Bristle worm (noun): A common name for polychaete worms, referring to their prominent chaetae.
- Annelid (noun): The broader phylum to which polychaete worms belong, which also includes earthworms and leeches.
- Parapodium (noun, plural: parapodia): The paired, fleshy, leg-like appendages characteristic of polychaetes.
Synonyms
- Bristle worm
- Marine annelid
Related Phrases and Terms
- Sedentary polychaete: A polychaete worm that lives in a fixed tube or burrow (e.g., fan worms, tube worms).
- Errant polychaete: A free-moving, often predatory polychaete worm (e.g., clam worms, scale worms).
- Chaetae (noun): The chitinous bristles that project from the parapodia, used for locomotion and defense.
Noun
- chiefly marine annelids possessing both sexes and having paired appendages (parapodia) bearing bristles