Phylum ________ Occurs Exclusively in Marine Animals

By BYJU'S Exam Prep

Updated on: September 25th, 2023

  1. Platyhelminthes
  2. Echinodermata
  3. Coelenterate
  4. Nematode

Phylum Echinodermata occurs exclusively in marine animals. Any member of this phylum is an echinoderm sea animals called echinodermata.

All about Platyhelminthes, Echinodermata, Coelenterate, and Nematode


  • Examples of echinoderms include sea stars, sea cucumbers, sea urchins, sand dollars, and brittle stars.
  • They are round or elongated and have a star-like appearance.
  • The calcium carbonate that makes up the skeleton.
  • The creatures have spiky skin.
  • Echinoderms also have very basic neurological, circulatory, and digestive systems.


  • Platyhelminthes are acoelomate flatworms that are triploblastic, bilaterally symmetrical, dorsoventrally flattened, and lack a distinct circulatory, skeletal, or respiratory system.
  • the phylum of animals Because they are flattened from head to tail, platyhelminthes are sometimes known as flatworms.
  • There are three layers of embryonic tissue in platyhelminthes.
    • ectoderm
    • mesoderm
    • Endoderm
    • Platyhelminthes are free-living and can be found in ponds, lakes, streams, ditches, and temporary puddles.


  • The name Coelenterata refers to the animal phyla Cnidaria and Ctenophora.
  • The body morphology is diploblastic, radially symmetric, and lacks a coelom.
  • There are numerous types of reproduction in coelenterates.
  • They have the ability to reproduce sexually, like all metazoa.
  • The fertilised eggs may result in larvae that are biologically and physically distinct from the adult stage of sexual reproduction.


  • Nematodes are tiny, elongated worms that range in size from 0.1 to 2.5 mm thick and 5 to 100 m long.
  • They are an animal phylum with a wide variety of habitats.
  • Numerous nematode species may live in freshwater, seawater, and soil.
  • These are particularly important in the cycling of nutrients and the release of nutrients for plant growth. They feed on bacteria, fungus, protozoans, and even other nematodes.


Phylum ________ occurs exclusively in Marine Animals. 1. Platyhelminthes 2. Echinodermata 3. Coelenterate 4. Nematode

In marine animals, Phylum Echinodermata exclusively occurs. In this phylum, the members are known as echinodermata.

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