The animals are classified into ten groups based on the body design, germinal layers, presence of notochord, etc. The ten groups are:
- Porifera
- Coelenterata
- Platyhelminthes
- Nematoda
- Annelida
- Arthropoda
- Mollusca
- Echinodermata
- Protochordata
- Vertebrata
Porifera:
- They are non-motile animals
- They have holes or pores all over their bodies
- Pores help in circulating water throughout the body
- Their bodies are covered with hard outside layer or skeleton
- They are mainly found in marine habitats.
- Eg: Spongilla, Sycon
Coelenterata:
- They have two layers of cells
- They live in water
- They have a cavity in the body
- They either live in colonies or in solitary
- Eg: Jellyfish, Hydra
Platyhelminthes:
- Their body is bilaterally symmetrical
- They have three layers of cells, which provides inside and outside body linings, that’s why they are known as “Triploblastic”
- Their body is flattened dorsiventrally (from top to bottom)
- They are either free-living or parasites
- Eg: Planarians, Liverflukes
Nematoda:
- Their body is bilaterally symmetrical
- They are also triploblastic
- They have cylindrical body
- A sort of cavity or pseudocoelom is present on body
- Eg: Ascaris, Roundworm
Annelida:
- They are also bilaterally symmetrical and triploblastic
- They have extensive organ differentiation in segmental fashion
- They are found in fresh water, marine water and land
- Eg: Leeches, Earthworms
Arthropoda:
- They are the largest group of animals.
- They are bilaterally symmetrical and segmented
- They have jointed legs
- They have open circulatory system
- Eg: Prawns, Butterflies
Mollusca:
- They have bilateral symmetry
- They have an open circulatory system and kidney-like organs for excretion
- They have a foot that is used for movement
- Eg: Snail, Mussels
Echinodermata:
- They are spiny skinned organisms
- They are triploblastic and have a coelomic cavity
- They have water driven tube system for movement
- They have hard calcium carbonate structures for skeletons
- Eg: Starfish, Urchins
Protochordata:
- They are bilaterally symmetrical and triploblastic
- They possess notochord which is a long rod-like support structure that runs along the back of the animal supporting the nervous tissue from the gut
- They are marine animals
- Eg: Balanoglossus, Herdemania
Vertebrata:
- They have proper vertebral column and internal skeleton
- They are bilaterally symmetrical, triploblastic, coelomic and segmented.
- They have a complex differentiation of body tissues and organs
- They are further grouped into five groups:
- Pisces:
- They are fish
- Their skin is covered with scales
- They have streamlined bodies
- They are cold-blooded and their hearts have two chambers
- They use their muscular tails for movement
- Eg: Tuna, Shark
- Amphibia:
- They can live on land as well as in water
- They have a three chambered heart
- They have mucus glands in skin
- Eg: Frogs, Salamander
- Reptilia:
- They are cold-blooded and breathe through lungs
- Most of them have a three chambered heart
- They lay eggs with tough outer coverings
- Eg: Lizard, Turtle
- Aves:
- They are warm blooded and have a four chambered heart
- Their forelimbs are modified into wings
- They lay eggs
- Their body is covered with feathers
- All birds fall in this category
- Mammalia:
- They are warm blooded and have a four chambered heart
- They have mammary glands
- Sweat and oil glands are present in their skin
Thanks for making the chapter of evolution a little bit simpler!
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Thank you Hardik
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Reblogged this on Love and Love Alone.
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