Definition

1. Noun:
   • A major taxonomic division in biological classification: "phylum Chordata" refers to a large, fundamental group within the animal kingdom, characterized by specific shared anatomical features.
   • Comprises animals possessing a notochord: This phylum includes all animals that, at some stage of their life cycle, have a notochord—a flexible, rod-shaped structure of support.

Usage Examples

• Noun:
  • All vertebrates, such as mammals and birds, belong to the phylum Chordata.
  • The presence of a dorsal nerve cord is a key characteristic of the phylum Chordata.

Advanced Usage

• "Within the phylum Chordata": used to specify a location or context inside this taxonomic group.
  • The evolution of jaws was a significant event within the phylum Chordata.

Variants and Related Words

• Chordate (n): Any member of the phylum Chordata.
  • A tunicate is a marine invertebrate chordate.
• Subphylum (n): A major subdivision within a phylum. The phylum Chordata contains subphyla like Vertebrata.
  • The subphylum Vertebrata is the most familiar group in the phylum Chordata.

Synonyms

• Chordates: A common synonym referring to the members of this group collectively.

Related Phrases

• Phylum level: The taxonomic rank of phylum.
  • At the phylum level, chordates are distinct from arthropods and mollusks.

Noun

1. comprises true vertebrates and animals having a notochord