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PHYLA OF ANIMALS

1.Porifera- They are simplest multi cellular animals. Small pores ostia are present all over the body. They have a single large opening osculum at top. They possess a canal system. EX-. Sycon, spongilla.

2.Coelenterata- Tentacles with stinging cells cnidoblast are present. Symmetry is radial. Animals exist in polyp and medusae form. Large body cavity coelenteron is present. They reproduce both asexually and sexually. EX- Hydra, corals.

3.Platyhelminthes- Commonly known as flat worms. Mostly, parasitic and have bilateral symmetry. Animals are triploblastic and mostly hermaphrodite. EX- Planaria, fasciola.

4.Nematoda- Commonly known as round worms. They are triploblastic with bilateral symmetry. True coelom is absent. Sexs are seprate. EX- Ascaris, enterobius.

5. Annelida- Segmented body with coelom. Body bears setae for locomotion. EX- Nereis, aphrodite.

6. Arthropoda - Animals are with jointed legs. Triploblastic coelom is reduced and filled with blood (called Haemocoel). Body covered with exoskeleton made of chitin. EX- Musca, apis.

7. Mollusca - Have soft unsegmented body. Outer surface of body is covered by a hard calcareous shell. Respiration is by gill called ctenidia. EX- Chiton, octopus.

8. Echinodermata- Triploblastic having radial symmetry in adults and bilateral symmetry in larvae. Body cavity is modified into water vascular system which have tube feet for locomotion. EX- Asterias, echinus.

9. Protochordata - Animals of this phylum possess both chordate and invertebrate characters. Mostly marine with bilateral symmetry. EX- Balanoglossus.

10. Vertebrata - Notochord at some stage of life is present. They have a dorsal hollow nerve chord. During some stage of life gills and tail is present. EX - Humans, frog, snake.