ABOVE: Side view of Fukuipteryx prima skeleton (left) and artist’s depiction (right)

Afossil of a previously undiscovered ancient avian species holds clues to the evolution of a tail bone in birds, according to a paper published in Communications Biology yesterday (November 14). A team led by paleontologist Takuya Imai at Fukui Prefectural University found the fossil at a quarry in Katsuyama, Japan and named the species Fukuipteryx prima. The pigeon-size bird lived during the early Cretaceous period, around 120 million years ago. This is the first avian fossil from this time period to be found outside China.

The F. prima fossil shares some characteristics with Archaeopteryx, the first known bird, but it also has features in common with modern birds—such as the presence of the pygostyle, a bony plate made of fused vertebrae that supports the tail feathers. Previously, the bone was...

Photo of the fossil (left) and schematic drawing of bones (right)

T. Imai et al., “An unusual bird (Theropoda, Avialae) from the Early Cretaceous of Japan suggests complex evolutionary history of basal birds,” Commun Biol, doi:10.1038/s42003-019-0639-4, 2019.

Emily Makowski is an intern at The Scientist. Email her at emakowski@the-scientist.com.

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