Three of the following four are examples of Coelenterata phylum, and therefore form a group. Which is the one that does not belong to that group?

The correct answer is Liver fluke.

 Key Points

• ​Liver fluke:-​
  • Liver flukes are a type of parasitic flatworm that infects the liver of various animals, including humans. The most common liver fluke species that infect humans are Fasciola hepatica and Fasciola gigantic.
  • These parasites are prevalent in certain parts of the world, particularly in regions with agricultural practices involving the consumption of raw or undercooked freshwater plants contaminated with the fluke's larvae.
• Coelenterata phylum:-
  • The phylum Coelenterata, also known as Cnidaria, is a diverse group of aquatic animals that includes jellyfish, corals, sea anemones, and hydroids.
  • However, it's important to note that the term "Coelenterata" is considered outdated and is no longer used in modern taxonomic classifications.
  • The phylum Cnidaria is the accepted and current term for this group of animals.

Additional Information

•  Sea pen:-
  • It is a type of marine animal belonging to the order Pennatulacea.
  • Sea pens are colonial organisms that resemble old-fashioned quill pens, hence their name.
  • They are soft-bodied and belong to the same phylum as corals and sea anemones, known as Cnidaria.
• Brain coral
  • It is a type of coral that belongs to the family Mussidae and the order Scleractinia.
  • It is named after its unique appearance, which resembles the convoluted surface of a brain.
  • Brain corals are found in tropical and subtropical marine environments, particularly in the Caribbean Sea and the Indo-Pacific region.
• Sea anemone:-
  • It is a marine invertebrate belonging to the phylum Cnidaria.
  • They are closely related to jellyfish and coral and are known for their unique appearance and behavior.
  • Sea anemones are named after the terrestrial flower, as their body shape and colorful tentacles resemble the petals of an open flower.