- These are non-motile organisms with pores all over their body leading to canal system that helps in circulating water throughout the body to bring in food and oxygen.
- These animals are covered with a hard outside layer or skeleton
- They are commonly called sponges example- sycon, spongilla and euplectelia.
- The body of these animals have a cavity, and is made up of two layers of cells.
- Some of these species live in colonies(corals) while others have solitary like span(hydra).
- The body of these animals are bilaterally symmetrical, and have three layers of cells and are thus called triploblastic.
- The three layers of cells allow outside and inside body linings as well as some organs to be made.
- There is no true coelom, in which well developed organs can be accommodated.
- The body is flattened from top to bottom i.e dorsoventrally.
- Examples are parasites like liver flukes or free-living animals like planarians.
- The nematoda body is bilaterally symmetrical, triploblastic and cylindrical.
- There are tissues but no organs and have a psuedo cavity
- Examples of nematoda are worms causing elephantiasis i.e filarial worms and pinworms found in intestines.
- Annelida are bilaterally symmetrical, triploblastic and have a true body cavity, allowing organs to be packed in body structure.
- Differentiation occurs in a segmental fashion with segments lined up one after the other from head to tail.
- Earthworms and leeches are examples of annelida.
- This is the largest group of animals
- They are bilaterally symmetrical, segmented, and have an open circulatory system and jointed legs.
- The coelomic cavity is blood filled in arthropoda.
- Examples of arthropoda are prawns, butterflies, scorpions and crabs.
- They are bilaterally symmetrical, have reduced coelomic cavity and little segmentation
- They have open circulatory system, kidney like organs for excretion and use foot for moving around
- Example are snails and mussels.
- These are spiny skinned, free-living marine animals.
- They are triploblastic, have a coelomic cavity and have peculiar water driven tube system that they use for moving around
- They have hard calcium carbonate structures as skeleton.
- Examples of echinodermata are starfish and sea urchins.
- They are bilaterally symmetrical, triploblastic and have notochord.
- Notochord is a long rod-like support structure that runs along the back of the animal separating the nervous tissue from the gut.
- Protochords may not have a proper notochord present at all stages in their lives
- Examples of protochords are balanoglossus, herdermania and amphioxus.
- These animals have a true vertebral column and internal skeleton, allowing a completely different distribution of muscle attachment points to be used for movement.
- They are bilaterally symmetrical, triploblastic, coelomic, segmented, dorsal nerve chord, paired gill pouches.
- These are fish.
- Their skin is covered with scales, they obtain oxygen dissolved in water using gills, have a streamlined body and a muscular tail.
- They are cold-blooded, have two chambered heart and lay eggs
- Examples are tuna, rohu and angler fish.
- They lack scales, have three-chambered heart and mucus glands in their skin .
- They respire through gills or lungs and lay eggs.
- Examples of amphibia are salamanders and hyla.
- These animals are cold-blooded, have scales, lay eggs, have three chambered heart and respire through lungs
- Crocodiles have four-chambered heart.
- Turtles, lizard and chameleon are examples of reptiles.
- They are warm-blooded, have four chambered heart, lay eggs and have an outside covering of feathers.
- They have two forelimbs modified for flight and breathe through lungs
- Examples are ostrich, crow, sparrow etc.
- Mammals are warm-blooded, have mammary glands for production of milk to nourish young ones.
- Their skin have hair as well as sweat and oil glands
- Platypus and echidna lay eggs.
- Examples of mammals are human, whale, bat etc.