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1 April 2013 A New Juvenile Specimen of Sapeornis (Pygostylia: Aves) from the Lower Cretaceous of Northeast China and Allometric Scaling of this Basal Bird
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Abstract

The discovery of an extremely well preserved new juvenile specimen of Sapeornis provides more anatomical information about this basal avian, and documents the first avian specimen from the Jehol Biota with detailed foot-pad integument preserved. This is the first Sapeornis specimen with a well preserved carpal X, astragalus and calcaneum. Seven major skeletal components from five well preserved juvenile and adult skeletons of Sapeornis were measured. The allometric differences associated with growth are shown to be distinct; all linear regressions resulted in high correlation coefficients consistent with a single growth series. The number of sacral vertebrae and free caudal vertebrae vary during ontogeny, and this may indicate that all the specimens can be assigned to a single species: Sapeornis chaoyangensis.

© by the Palaeontological Society of Japan
Hanyong Pu, Huali Chang, Junchang Lü, Yanhua Wu, Li Xu, Jiming Zhang, and Songhai Jia "A New Juvenile Specimen of Sapeornis (Pygostylia: Aves) from the Lower Cretaceous of Northeast China and Allometric Scaling of this Basal Bird," Paleontological Research 17(1), (1 April 2013). https://doi.org/10.2517/1342-8144-17.1.27
Received: 29 February 2012; Accepted: 1 June 2012; Published: 1 April 2013
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