Evolution by Steps (IMAGE)

University of Chicago Medical Center

Evolution by Steps

Caption

A new study of Tiktaalik roseae (middle), a 375-million-year-old transitional fossil, highlights an intermediate step between the condition in fish like Eusthenopteron (bottom) and that in early limbed forms like Acanthostega (top). The new data are described in a paper by Jason Downs, Ted Daeschler and Neil Shubin in the Oct. 16 edition of Nature.

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Kalliopi Monoyios

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