animals are beings multicellular able to apprehend their environment and to voluntarily move there. They are always heterotrophic. They form one of the subdivisions called reigns Eucaryotes according to traditional classification. Today phylogenetic classification employ the term métazoaires to indicate this same group, but the position of this one, like its subdivisions, were corrected in the light of studies genetics and according toanalyze parsimonious characters presented.
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One classifies each species listed in a tree structure of the animal kingdom, on the basis of the junction. Each junction is composed of classes, themselves divided into orders, then in families, and finally in kinds. The Latin names given to the species are composed of two words, indicating the kind and the species.
This classification rests primarily on molecular criteria (comparison of sequences ofADN). This method of classification which is particularly reliable when it is reproduced by using a great number of different sequences, has like disadvantage of missing "resolution sometimes". Thus the distribution of the junctions between spiraliens and lophophoriens still rests on criteria embryologic. Of course like any classification, this one is prone to evolution.
Whereas the majority of the branches constitute various levels of complexity (for example the triploblastiques ones derive from diploblastic) the divergence protostomien/deutérostomien corresponds to two completely opposite choices of organization not deriving one from the other, but having a common origin.
Phylogenetic classification of the alive one by Guillaume Lecointre and Herve Guyader with the editions Belin
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