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The phantoms of a high-seven - or - why do our thumbs stick out?
Woltering, Joost M; Meyer, Axel.
Afiliação
  • Woltering JM; Chair in Zoology and Evolutionary Biology, Department of Biology, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany.
  • Meyer A; Chair in Zoology and Evolutionary Biology, Department of Biology, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany.
Front Zool ; 12: 23, 2015.
Article em En | MEDLINE | ID: mdl-26379756
The earliest tetrapods had hands and feet with up to eight digits but this number was subsequently reduced during evolution. It was assumed that lineages with more than five digits no longer exist but investigations of clawed-frogs now indicate that they posses a rudimentary or atavistic sixth digit in their hindlimb. A recent reevaluation of the stem tetrapod Ichthyostega predicts that its seven digits evolved from two different types of ancestral fin radials, pre-axial and post-axial. In this context we now ask the question, should we consider a pre-axial origin of the thumb as reason for its unique genetic signature?
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Front Zool Ano de publicação: 2015 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Front Zool Ano de publicação: 2015 Tipo de documento: Article