Inner ear of the coelacanth fish Latimeria has tetrapod affinities

Nature
B Fritzsch

Abstract

Auditory reception in elasmobranchs, teleosts and amphibians may be mediated by various inner-ear sensory epithelia 1–3, including the basilar papilla, which seems to be the precursor of the cochlea in mammals. The origin of the basilar papilla remains a major unsolved problem for understanding the evolution of hearing in terrestrial vertebrates4–6. Study of living species indicates that the basilar papilla is a unique feature of tetrapods 6,7, but palaeonto-logical data indicate that this epithelium as well as a middle ear, is already present in crossopterygian fish 8–10. However, no basilar papilla has been found in the only living crossopterygian species, the coelacanth Latimeria chalumnae 11. I have re-examined the inner ear of adult and embryonic Latimeria and find a membranous specialization which resembles in structure, position and innerva-tion pattern the basilar papilla of tetrapods, in particular amniotes. No epithelium comparable to the basilar papilla was found in lungfish. I suggest that the basilar papillae of Latimeria and tetrapods are homologous and evolved only once in their common ancestor.

Citations

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Sep 30, 2009·Hearing Research·Geoffrey A Manley
Nov 30, 2012·Developmental Dynamics : an Official Publication of the American Association of Anatomists·Benjamin J KopeckyBernd Fritzsch
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Apr 17, 2012·Biochemical and Biophysical Research Communications·Xiao-Tong WangHao Zhang
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Jun 23, 1988·Nature
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Nov 15, 2021·Journal of Anatomy·Kayla D BazzanaRobert R Reisz

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