Vertebrate(Lecture ppt) Ch 9-1 - Eusthenopteron Nature The...

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Eusthenopteron 新新新 ( 新新新新 ) Nature The pectoral fin of Panderichthys and the origin of digitsatherine A. Boisvert 1 , Elga Mark-Kurik 2 & Per E. Ahlberg 1 One of the identifying characteristics of tetrapods (limbed vertebrates) is the presence of fingers and toes. Whereas the proximal part of the tetrapod limb skeleton can easily be homologized with the paired fin skeletons of sarcopterygian (lobe-finned) fish, there has been much debate about the origin of digits. Early hypotheses 1 interpreted digits as derivatives of fin radials, but during the 1990s the idea gained acceptance that digits are evolutionary novelties without direct equivalents in fish fin skeletons. This was partly based on developmental genetic data 2 , but also substantially on the pectoral fin skeleton of the elpistostegid (transitional fish/tetrapod) Panderichthys , which appeared to lack distal digit-like radials 3 . Here we present a CT scan study of an undisturbed pectoral fin of Panderichthys
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