About nothing

@article{Brower2014AboutN,
  title={About nothing},
  author={A. Brower and Mario C. C. Pinna},
  journal={Cladistics},
  year={2014},
  volume={30}
}
In light of recent terminological controversy, this article reviews cladistic conceptions of character states coded as absences, symplesiomorphies, and secondary losses. The first section addresses absence as a question of ontology vs. epistemology. The second and third sections address the evidentiary status of symplesiomorphy in cladistics, the fourth contrasts primitive absence with secondary loss, and the fifth clarifies the meaning of “grouping”. While secondary losses (reversals) are… Expand
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