Abstract
Homology is among the most important comparative concepts in biology. Today, the evolutionary reinterpretation of homology is usually conceived of as the most important event in the development of the concept. This paradigmatic turning point, however important for the historical explanation of life, is not of crucial importance for the development of the concept of homology itself. In the broadest sense, homology can be understood as sameness in reference to the universal guarantor so that in this sense the different concepts of homology show a certain kind of “metahomology”. This holds in the old morphological conception, as well as in the evolutionary usage of homology. Depending on what is (or was) taken as a guarantor, different types of homology may be distinguished (as idealistic, historical, developmental etc.). This study represents a historical overview of the development of the homology concept followed by some clues on how to navigate the pluralistic terminology of modern approaches to homology.
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Notes
A similar idea (to compare the skull with vertebrae) was simultaneously developed by Oken and Duméril (Rieppel 1988, p.41).
It should be mentioned, however, that the French anatomist Vicq d’Azyr found the intermaxillary bone in man in the same year (1794) as did Goethe (Russell 1916, p. 45). Another crucial idea—that of serial homology—was published even earlier (1774) by Vicq d’Azyr, who first described a serial homology comparing forelimbs to hindlimbs in quadrupeds and legs to arms in man (Owen 1848, p. 8; Appel 1987, p. 70; Rádl 1905, p. 190, 1913, p. 308).
Owen’s archetype is commonly understood as a Platonic idea, but the concept of vertebrate archetype was changing even throughout Owen’s carrier. It commenced from the eternal ideal scheme and proceeded through the parental type of divergent development up to methodological instrument (Camardi 2001, p. 504).
Xenology is defined as condition due to the horizontal transfer of genetic material among different species. Synology is a xenology arisen due to the fusion of formerly independent lineages (hybridization) to form one taxon (Gogarten 1994). Partial homology refers to exon shuffling and other recombination processes. Gametology relates to the origin of genetic determination of sex through lack of recombination between sex chromosomes (García-Moreno and Mindell 2000; Mindell and Meyer 2001). More such terminology can be found in the literature.
“Amphioxus is a fish-like animal which still exist to-day. The Ichthyosaurus is a reptile long extinct. Nevertheless the Darwinians call Amphioxus the more primitive and Ichthyosaurus the more advanced form. The uncertainty among evolutionists as to which forms are the more and which less primitive, is very great indeed. We do not know with absolute certainty the relative position (in time) of any form—not even of man itself” (Rádl 1930, p. 176).
In German original: “Nicht the Phylogenie entscheidet über die Homologie, sondern die Homologie über die Phylogenie.”
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I thank to Anton Markoš, Alexander Nemec, and anonymous reviewers for worthy comments on various versions of the text. This work has been supported by the Research Program CTS MSM 0021620845 and the GPSS Major Awards Program, a joint program of the Interdisciplinary University of Paris and Elon University.
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Kleisner, K. The Formation of the Theory of Homology in Biological Sciences. Acta Biotheor 55, 317–340 (2007). https://doi.org/10.1007/s10441-007-9023-8
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DOI: https://doi.org/10.1007/s10441-007-9023-8