
Phylogenetic classification. The members of a group in a cladistic classification share a more recent common ancestor with one another than with the members of any other group. A group at any level in the classificatory hierarchy, such as a family, is formed by combining a subgroup at the next lowest level (the genus, in this case) with the subgrou...
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http://www.fossilmall.com/Science/Glossary.htm

the cladistic method of classification.
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https://www.infoplease.com/dictionary/cladism
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