Definition

Noun: * A major taxonomic division (phylum) within the animal kingdom, comprising invertebrate animals characterized by a simple, sac-like body plan with a single internal cavity (the coelenteron) that serves for both digestion and circulation, and specialized stinging cells called cnidocytes. This group includes organisms such as hydras, jellyfish, sea anemones, and corals.

Usage

• The term phylum Coelenterata is used in formal biological classification and scientific contexts to group and discuss these specific aquatic animals.
• It is often used when describing evolutionary relationships, anatomical features, or ecological roles common to all members of the phylum.

Examples

• Noun:
  • The study focused on the nervous system development within phylum Coelenterata.
  • Corals and jellyfish, both belonging to phylum Coelenterata, possess stinging cells for capturing prey.
  • Some textbooks now use the name phylum Cnidaria as a synonym for phylum Coelenterata.

Advanced Usage

• The name Coelenterata is derived from Greek words meaning "hollow intestine," referring to the characteristic central digestive cavity.
• In modern taxonomic revisions, phylum Cnidaria is often the preferred term, while Coelenterata is sometimes used in a broader sense to also include the comb jellies (phylum Ctenophora), though this usage is less common.

Variants and Related Words

• Coelenterate (noun): An individual animal belonging to the phylum Coelenterata.
  • The diver observed a colorful coelenterate attached to the reef.
• Cnidaria (noun): The phylum name now more commonly used as a direct synonym for Coelenterata.
• Cnidarian (noun): An individual animal belonging to the phylum Cnidaria; synonymous with coelenterate.

Synonyms

• Phylum Cnidaria: The modern taxonomic term for the same group of animals.

Noun

1. hydras; polyps; jellyfishes; sea anemones; corals