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CT scan of dermal rays of pectoral fin
A computed tomography scan showing the dermal rays of the pectoral fin of Eusthenopteron foordi, a late Devonian (roughly 375 million years ago) fish with the primitive features of tetrapods.
[Research supported by National Science Foundation grants EAR 0207721, EAR 0544093, EAR 0208377 and EAR 0544565.]
Learn more about this research in the University of Chicago news story How fish fins evolved just before the transition to land. (Date image taken: unknown; date originally posted to NSF Multimedia Gallery: March 25, 2020)
Credit: Stewart, et al; PNAS
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