|Species: groups of individuals based on common characteristics. See also biological species, natural kinds.|
Books on Amazon
|Dennett I 48
Species/Darwin: actually arbitrary! Applied to a number of individuals for convenience!
Dennett I, 390ff
Speciation/Darwin: Competition between closely related forms Driving force for speciation. So the presence and not the absence of two groups is therefore important. (Not "empty space in the design room").
Darwins gefährliches Erbe Hamburg 1997
Spielarten des Geistes Gütersloh 1999