The observational and theoretical components of homology: a study based on the morphology of the dermal skull‐roofs of rhipidistian fishes

This paper is a study of the ways in which direct observation of the morphology of organisms, and indirect inferences about the kinds of morphological change that may take place in phylo-geny, interact in the formation of judgements about homology. The dispute about the correct identification of dermal skull-roof bones in the osteolepiform and porolepiform rhipidistian fishes is used to illustrate the various issues. Some suggestions are made about the ways in which such disputes maybe resolved.

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