Published online by Cambridge University Press: 31 December 2018
The Weberian apparatus (WA), a structure consisting of the greatly modified four anteriormost vertebral elements, enhances the hearing in Otophysi. Since WA is one of the most spectacular examples of vertebral column transformation and regionalization, the mechanisms underpinning WA origin and evolution have received considerable attention. A number of hypotheses exist, but a consensus has not been reached, primarily due to the relative paucity of experimental data. One of the most plausible propositions concerning the leading role of specific developmental changes in WA evolution, likely constituting differences in gene expression, was offered by Bird and Hernandez (2009). Here, we provide an analysis of developmental and morphological data obtained from experiments with cyprinids, in which developmental deviations were caused by induced hypo- and hyperthyroidism. The synthesis of our results with morphological and developmental data obtained in different teleosts empirically demonstrates the involvement of different developmental changes in WA evolution. Moreover, our results emphasize the potential role of thyroid signaling pathway in bony fish (Osteichthyes) evolution, including the origin of various types of morphological novelties.
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