Darwin, Haeckel , and the “ Mikluskan gas organ theory”

ORCID
0000-0003-1359-2036
Affiliation
Paläontologische Sammlung Fachbereich Geowissenschaften der Universität Tübingen Tübingen Germany
Werneburg, Ingmar;
GND
123108586
Affiliation
Arbeitsgruppe Biologiedidaktik, Institut für Zoologie und Evolutionsforschung, Fakultät für Biowissenschaften Friedrich‐Schiller‐Universität Jena Jena Germany
Hoßfeld, Uwe;
GND
1070488542
Affiliation
Arbeitsgruppe Biologiedidaktik, Institut für Zoologie und Evolutionsforschung, Fakultät für Biowissenschaften Friedrich‐Schiller‐Universität Jena Jena Germany
Levit, Georgy S.

A previously unknown reference to the Russian ethnologist, biologist, and traveler Nikolai N. Miklucho‐Maclay (1846–1888) was discovered in correspondence between Charles Darwin (1809–1882) and Ernst Haeckel (1834–1919). This reference has remained unknown to science, even to Miklucho‐Maclay's biographers, probably because Darwin used the Russian nickname “Mikluska” when alluding to this young scientist. Here, we briefly outline the story behind the short discussion between Darwin and his German counterpart Haeckel, and highlight its importance for the history of science. Miklucho‐Maclay's discovery of a putative swim bladder anlage in sharks, published in 1867, was discussed in four letters between the great biologists. Whereas, Haeckel showed enthusiasm for the finding because it supported (his view on) evolutionary theory, Darwin was less interested, which highlights the conceptual differences between the two authorities. We discuss the scientific treatment of Miklucho‐Maclay's observation in the literature and discuss the homology, origin, and destiny of gas organs—swim bladders and lungs—in vertebrate evolution, from an ontogenetic point of view. We show that the conclusions reached by Miklucho‐Maclay and Haeckel were rather exaggerated, although they gave rise to fundamental insights, and we illustrate how tree‐thinking may lead to differences in the conceptualization of evolutionary change.

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