Phylum: Porifera
Cell structure: Multicellular
  • Multicellular, sponge-like, marine organisms.
  • Have pores in the body called Ostia.
  • Found inside the marine ecosystem.
  • Water enters inside the pores and circulates in the canal like system.
  • Receives food and oxygen through the water that enters the pores.
  • Reproduce sexually and asexually.
Euplectella sycon. Calcarea (Calcareous sponges)
Phylum: Coelenterata
Cell structure: Multicellular
Symmetry: Radial
Germ layer: Diploblastic (ectoderm & endoderm)
jelly fish.jpg
  • A jelly type substance called mesoglea is found in between ectoderm and endoderm.
  • Animals in this phylum have a central gastrovascular cavity known as coelenteron with a mouth. The mouth is surrounded by short tentacles which can have cnidoblast or nematocyst which bear stinging cells.
  • Coelenterates has a peculiar character of polymorphism. Accordingly, the same individual exhibit characters of two different types of individuals.
    Reproduce sexually and asexually.
Hydra, Jellyfish
Phylum: Platyhelminthes
Cell structure: Multicellular
Symmetry: Bilateral
Germ layer: Triploblastic
  • Animals belong to this phylum are parasitic.
  • These animals have hooks and suckers that help them to attach to the host.
  • Special cells called flame cells help the animals to excrete.
  • Reproduce sexually. These animals are hermaphrodites have both male and female reproductive organs in the same individual.
Flatworms like Liverfluke, Tapeworm
Phylum: Aschelminthes
Cell structure: Multicellular
Symmetry: Bilateral
Germ layer: Triploblastic
Coelom: Pseudocoelom.
round worm.jpg
  • Parasitic animals.
  • Round bodied animals without segments.
  • Covered by a thin cuticle.
  • Separate sexes are found in this category of animals.
  • They spread diseases like elephantiasis and ascariasis.
Roundworms like Ascaris and Wuchereia
Image credit:
Sponges: Free image from Wikipedia;
Jellyfish: Free image from Wikiwand;
Tapeworm: Free image from Wikipedia;
Roundworm: Free image from Wikipedia;