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[dinosaur] Praeornis is basal bird tail feather from Late Jurassic of Kazakhstan

Ben Creisler

A new paper:

Federico L. Agnolin, SebastiÃn Rozadilla & Ismar de Souza Carvalho (2017)
Praeornis sharovi Rautian, 1978 a fossil feather from the early Late Jurassic of Kazakhstan
Historical Biology (advance online publication)
doi:Â Âhttps://doi.org/10.1080/08912963.2017.1413102Â Â

Since its original description as a feather belonging to a basal bird, the phylogenetic position of Praeornis sharovi was debated. It was considered as belonging to a bird, a cycad leaf, or as a âtransitionalâ integumentary structure between reptile scales and bird feathers. Recently, a basal enantiornithine bird was collected in Early Cretaceous beds of Brazil. This specimen shows very well-preserved rachis-dominated tail feathers with a very thick rachis and thick and rigid barbules. These features are present in Praeornis, suggesting that this fossil may be interpreted as the tail feather of a basal bird. In this way, Praeornis constitutes one of the oldest records of rachis-dominated feathers in the world. Rachis-dominated tail feathers, including that of Praeornis appear to be rigid paired structures not performed for aerodynamical purposes, suggesting that may be important in body balance.

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