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Phylum 4 – Nematoda

  1. Bilaterally symmetrical body
  2. Triploblastic
  3. Body shape – cylindrical
  4. Lack of organs. Presence of tissues
  5. Presence of pseudo-body cavity (not real, sort of a body cavity)

Examples of organisms belonging to this phylum – Roundworms, Tapeworms, Ascaris


Phylum 5 – Annelida

  1. Bilaterally symmetrical
  2. Triploblastic
  3. True body cavity
  4. Well-differentiated organs packed inside the body cavity
  5. Differentiation of organs is seen in segments of the body
  6. Habitat of organisms – fresh water, sea, and land

Examples of organs belonging to this phylum – Earthworms and Leeches


Phylum 6 – Arthropod

  1. Anthro – jointed; pod – legs
  2. Largest group of animals
  3. Bilaterally symmetrical and segmented
  4. The Body cavity is filled with blood as blood does not flow through blood vessels. Lack of well-defined blood vessels is known as open circulatory system

Examples of organisms belonging to this phylum – Butterflies, Cockroaches, Spiders, Crabs, Scorpions, and Houseflies


Phylum 7 – Mollusca:

  1. Bilateral symmetry
  2. Reduced coelom cavity
  3. Segmentation is seen
  4. Presence of kidney-like organs for the purpose of excretion
  5. Presence of foot for locomotive activity

Examples of organisms belonging to this phylum – Snails and Mussels


Phylum 8 – Echinodermata

  1. Echinos – hedgehog; derma – skin (in Greek). Spiny, skinned animals
  2. Triploblastic
  3. Presence of coelom body cavity
  4. Locomotive activity by using a special tube system driven by water
  5. Presence of hard calcium carbonate (CaCO3) structures which form bones and skeleton system
  6. Found in marine habitat

Examples of organisms belonging to this phylum – Starfish and Sea Urchins


Phylum 9 – Protochordata

  1. Bilaterally symmetrical
  2. Triploblastic
  3. Presence of coelom body cavity
  4. Presence of advanced body design, called notochord during some stages of growth. A notochord is a rod-like structure running on the ventral side of the body, supporting the back of an animal and separates the nervous tissue from the gut
  5. Marine habitat

Examples of organisms belonging to this phylum – Amphioxus, Herdemania, Balanoglossus


Phyla of Animalia Kingdom Homework Help