Full Idea
Species are, by definition, the lowest-level classificatory unit, or basal taxonomic unit, for biological organisms.
Gist of Idea
Species are the lowest-level classification in biology
Source
John Dupré (The Disorder of Things [1993], 2)
Book Reference
Dupré,John: 'The Disorder of Things' [Harvard 1995], p.37
A Reaction
I think this is the 'infima species' for Aristotelians. What about 'male' and 'female' in each species?