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Sign up with Google. Scientists now understand that major animal groups are related in ways not anticipated by classical taxonomists. So, for example, we now understand that the bird lineage Class Aves shares a more recent ancestor with some modern reptiles crocodiles than with others snakes. Yet both snakes and crocodiles are part of Class Reptilia.
The many changes in our understanding of evolutionary relationships among animals have resulted in confusing and conflicting relationships among animal groups defined using ranks. Even the field of zoology retains a recognition of these classical ranks in the major fields of specialization: ornithology birds , herpetology reptiles and amphibians , etc. For this reason, we continue to display them in our classification, while at the same time acknowledging that their usefulness is limited and that they may disappear in the future.
The Animal Diversity Web strives to represent taxonomies that reflect current understanding of evolutionary relationships among animals see nested hierarchies in the classification tab.
In the interest of usability and ease of navigation for our diverse audience, we also retain certain rank labels. As a result, you may find areas of our animal taxonomy where ranks seem to be inconsistently used or contradictory.
Please understand this as the unfortunate result of merging two widely used but incompatible systems of classification. To cite this page: Myers, P. Espinosa, C. Parr, T. Jones, G. Hammond, and T.
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