polychaeta

Thân thiện

A marine biologist carefully observes a polychaeta in a tide pool.

Definition

1. Noun (plural, treated as singular or plural):
   • A class of marine annelid worms: Polychaeta refers to a major class of segmented worms (annelids) characterized by having numerous bristles (chaetae) on each body segment. They are predominantly marine organisms.

Usage Notes

• The term "Polychaeta" is used in scientific and zoological contexts to classify a specific group of worms. It is often used with a singular verb when referring to the class as a whole (e.g., "Polychaeta is diverse") but can take a plural verb when referring to the individual worms (e.g., "These polychaeta are burrowers").

Examples

• Noun:
  • Polychaeta is one of the largest and most diverse classes of annelids.
  • The sandy shore was teeming with various polychaeta.
  • Scientists study the morphology of Polychaeta to understand marine ecosystems.

Advanced Usage

• In taxonomic hierarchy: The name is formally written in italics as when referring to the taxonomic class.
  • The class Polychaeta includes families such as Nereididae and Sabellidae.

Variants and Related Words

• Polychaete (noun/adjective): The common form used to refer to an individual worm belonging to this class or as an adjective describing them.
  • The polychaete worm has a distinct, segmented body.
• Polychaetous (adjective): A less common adjective form meaning 'of or pertaining to polychaetes'.

Synonyms

• Bristle worms: A common name for polychaetes, referring to their characteristic bristles.
• Marine annelids: A broader descriptive term.

Related Phrases/Terms

• Sedentary polychaetes: Polychaetes that live in fixed tubes or burrows (e.g., fan worms).
• Errant polychaetes: Active, free-moving polychaetes (e.g., ragworms).

Học thuật

Noun

1. marine annelid worms

Từ đồng nghĩa

• Polychaeta
• class Polychaeta