Species Concepts:  Typological, Biological, Evolutionary, & Phylogenetic - Differences Between???   Good way to remember differences?
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Typological-classification is determined by comparison of physical characteristics with a type specimen; descriptions provide detailed records of physical characteristics of many organisms, but does not allow for genetic variations.

Biological-classification is determined by similar characteristics and ability to produce fertile offspring; working definition applies in most cases, but some organisms interbreed occasionally. Doesn't account for extinct species.

Phylogenetic-classification is determined by evolutionary history; accounts for extinct species, considers molecular data, and solves problems of other species concepts, but evolutionary histories are not known for all species.

Source: Biology Class

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