Definition

1. Noun:
   • A taxonomic category in biological classification: "phylum Chaetognatha" is the scientific name for a major division of the animal kingdom comprising the arrow worms. It is a rank below kingdom and above class.
   • A group of marine organisms: Specifically, it refers to the phylum containing small, transparent, predatory marine worms known for their arrow-like shape.

Usage Examples

• Noun:
  • The phylum Chaetognatha includes all known species of arrow worms.
  • Scientists study the phylum Chaetognatha to understand planktonic marine ecosystems.

Advanced Usage

• In taxonomic hierarchy: The term is used in formal scientific contexts to classify organisms. It is always capitalized when referring to the formal taxon: .
  • The phylogenetic position of Phylum Chaetognatha among bilaterian animals has been debated.

Variants and Related Words

• Chaetognath (n): An individual organism belonging to the phylum Chaetognatha; an arrow worm.
  • The chaetognath is a common predator in the plankton.
• Chaetognathan (adj): Of or relating to the phylum Chaetognatha.
  • The chaetognathan body plan is characterized by lateral fins.

Synonyms

• Arrow worms: The common name for organisms in this phylum.
• Chaetognaths: Another term for the organisms within this taxonomic group.

Related Phrases

• Member of the Chaetognatha: A phrase used to specify an organism's classification.
  • Sagitta is a well-known genus of the Chaetognatha.

Noun

1. arrowworms: a group of small active transparent marine worms