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Types of Animals

Updated on August 30, 2015

Main Groups of Invertebrates

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PoriferansCoelenteratesAnnelidsMolluscsDiplopodsCrustaceansArachnidsNematodesPlatyhelminthesChilopodsInsectsEchinoderms
Poriferans
Poriferans
Coelenterates
Coelenterates
Annelids
Annelids
Molluscs
Molluscs
Diplopods
Diplopods
Crustaceans
Crustaceans
Arachnids
Arachnids
Nematodes
Nematodes
Platyhelminthes
Platyhelminthes
Chilopods
Chilopods
Insects
Insects
Echinoderms
Echinoderms

Today, more than 1.2 million members of the animal kingdom have been identified. Scientists have classified them, besides giving them specific names. However, a large number of animals still remain to be classified and named.

Animals have been classified into different groups on the basis of their similarities and dissimilarities. For the purpose of classification, each animal’s name is written in two words. The first word indicates its genus and the second its species. Several genera (plural of genus) having similarities form an order. Several orders make a class, and similar classes constitute a phylum.

Animals are broadly classified into two groups- the Invertebrates and Vertebrates. The animals not having a backbone are called invertebrates. Examples: Amoeba, Corals, Worms, Snails, Insects and Starfish. The vertebrate group includes the animals which have a backbone. Fishes, Amphibians, Reptiles, Birds and Mammals belong to this group.

Main Groups of Invertebrates

Group
Animal
Protozoan’s
Amoeba
Poriferans
Sponge
Coelenterates
Jellyfish, Coral, Sea Anemone
Platyhelmintes
Flatworm, Liver Fluke, Tapeworm
Nematodes
Roundworm
Annelids
Earthworm, Leech
Mollusks
Snail, Slug, Clam, Limpet, Octopus
Chilpods
Centipede
Diplopods
Millipede
Crustaceans
Prawn, Crab, Wood Louse
Insects
Butterfly, Wasp, Ant, Louse, Beetle
Arachnids
Spider, Scorpion, Mite
Echinoderms
Starfish, Sea Cucumber, Sea Urchin
Urochordates
Sea Squirt

Main Groups of Vertebrates

Group
Animal
Fishes
Shark, Trout, Eel, Seahorse
Amphibians
Frog, Toad, Salamander
Reptiles
Lizard, Snake, Tuatara, Crocodile
Birds
Crow, Ostrich, Parrot
Mammals
Homo Sapiens (Human being), Dog, Bat, Whale, Kangaroo, Platypus

Of the 5 to 10 million living species, 75 percent are animals, 18 percent plants and 7 percent simple organisms. Out of these, we know about the species of over 12, 00,000 animals, 3, 00,000 plants and 1, 00,000 other creatures. Information about the remaining species is yet to be collected. This book provides information about some of the invertebrates and vertebrates.

Species of Known Animals

 
 
Insects
9,50,000
Other Invertebrates
2,27,000
Vertebrates
45,000

Numbers of Known Vertebrates

 
 
Fishes
23,000
Amphibians
3,000
Reptiles
6,000
Birds
8,600
Mammals
4,200

Main Groups of Vertebrates

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FishAmphibianReptileBirdMammal
Fish
Fish
Amphibian
Amphibian
Reptile
Reptile
Bird
Bird
Mammal
Mammal

Special Characteristics of Vertebrates

Fishes

Scientific name- Pisces, Live in water, Cold-blooded, Respiration through gills.

Amphibians

Live in water as well as land, Cold-blooded, Respiration through nostrils.

Reptiles

Crawling creatures, Live in water as well as land, Cold-blooded.

Birds

Flying creature, Mainly live on trees, Warm-blooded.

Mammals

Live on land, Warm-blooded, Feeding milk to their young ones, Normally every mammal gives birth to young ones.

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