Biology and Philosophy 2 (4):397-414 (1987)

Abstract
The concept of individuality as applied to species, an important advance in the philosophy of evolutionary biology, is nevertheless in need of refinement. Four important subparts of this concept must be recognized: spatial boundaries, temporal boundaries, integration, and cohesion. Not all species necessarily meet all of these. Two very different types of pluralism have been advocated with respect to species, only one of which is satisfactory. An often unrecognized distinction between grouping and ranking components of any species concept is necessary. A phylogenetic species concept is advocated that uses a grouping criterion of monophyly in a cladistic sense, and a ranking criterion based on those causal processes that are most important in producing and maintaining lineages in a particular case. Such causal processes can include actual interbreeding, selective constraints, and developmental canalization. The widespread use of the biological species concept is flawed for two reasons: because of a failure to distinguish grouping from ranking criteria and because of an unwarranted emphasis on the importance of interbreeding as a universal causal factor controlling evolutionary diversification. The potential to interbreed is not in itself a process; it is instead a result of a diversity of processes which result in shared selective environments and common developmental programs. These types of processes act in both sexual and asexual organisms, thus the phylogenetic species concept can reflect an underlying unity that the biological species concept can not
Keywords Species concepts  individuality  pluralism  monophyly  cladistics  phylogeny
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DOI 10.1007/BF00127698
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References found in this work BETA

Phylogenetic Systematics.Willi Hennig - 1966 - University of Illinois Press.
A Matter of Individuality.David L. Hull - 1978 - Philosophy of Science 45 (3):335-360.
Species.Philip Kitcher - 1984 - Philosophy of Science 51 (2):308-333.

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Citations of this work BETA

Microbiology and the Species Problem.Marc Ereshefsky - 2010 - Biology and Philosophy 25 (4):553-568.
Species.Marc Ereshefsky - 2010 - Stanford Encyclopedia of Philosophy.
Populations as Individuals.Roberta L. Millstein - 2009 - Biological Theory 4 (3):267-273.

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