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Erkenntnis

, Volume 79, Issue 3, pp 701–727 | Cite as

Venomous Dinosaurs and Rear-Fanged Snakes: Homology and Homoplasy Characterized

  • Adrian Mitchell Currie
Original Article

Abstract

I develop an account of homology and homoplasy drawing on their use in biological inference and explanation. Biologists call on homology and homoplasy to infer character states, support adaptationist explanations, identify evolutionary novelties and hypothesize phylogenetic relationships. In these contexts, the concepts must be understood phylogenetically and kept separate: as they play divergent roles, overlap between the two ought to be avoided. I use these considerations to criticize an otherwise attractive view defended by Gould, Hall, and Ramsey & Peterson. By this view, homology and homoplasy can only be delineated qua some level of description, and some homoplasies (parallelisms) are counted as homologous. I develop an account which retains the first, but rejects the second, aspect of that view. I then characterize parallelisms and convergences in terms of their causal role. By the Strict Continuity account, homology and homoplasy are defined phylogenetically and without overlaps, meeting my restriction. Convergence and parallelisms are defined as two types of homoplasy: convergent homoplasies are largely constrained by external factors, while parallelisms are due to internal constraints.

Keywords

Venom Gland Alpha Male Internal Constraint Maxillary Tooth Developmental Constraint 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

Many thanks to Russell Powell and Brian Hall for comments on earlier drafts. Versions of this paper has been presented at both the ANU and Otago Philosophy departments, I am grateful for the discussion and comments I received.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.c/o RSSS Philosophy DepartmentAustralia National UniversityCanberraAustralia

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