André Bon September 2009
| There is a backbone: Vertebrates |
Skin more or less covered by hair | Mammals | ||||
| Skin without hair | Skin more or less covered by feathers | Birds | ||||
| Skin without feathers | Bare skin | Amphibians | ||||
| Skin with scales | Scales are not separate and detachable | Reptiles | ||||
| Scales are separate and detachable | Fishes | |||||
| There is no backbone: Invertebrates |
Carapace | Body in two parts | Four pairs of legs | Arachnids | |
| More than four pairs of legs | Crustaceans | ||||
| Body in more than two parts | Body in three parts | Insects Butterflies Dragonflies and Damselflies Other insects |
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| Body in more than three parts | Myriapods | ||||
| No carapace | Shell | Shell in one part | Coiled shell | Gastropods | |
| Shell not coiled | Cephalopods | ||||
| Shell in two parts | Bivalves | ||||
| No shell | Annelids | ||||
André Bon September 2009