Moulting tail feathers in a juvenile oviraptorisaur.
Xu et al. describe the extraordinarily preserved feathers from two subadults of the oviraptorisaur Similicaudipteryx from the Yixian Formation of Liaoning, China. The preserved tail feathers of the juvenile specimen (STM4.1) show a morphology not previously observed in any fossil feathers. The tail feathers of an older, immature specimen (STM22-6) show a typical closed pennaceous structure with a prominent, planar vane. I propose that the feathers of the tail of the juvenile specimen are not a specialized feather generation, but fossilized 'pin feathers' or developing feather germs.
Department of Ecology and Evolutionary Biology, and Peabody Natural History Museum, Yale University, New Haven, Connecticut 06520-8150, USA. richard.prum@Yale.edu
Richard O
RO
Prum
D000375:Aging; D000818:Animals; D005075:Biological Evolution; D002681:China; D025061:Dinosaurs / Q000033:anatomy & histology* / Q000254:growth & development; D005241:Feathers / Q000033:anatomy & histology* / Q000254:growth & development*; D005580:Fossils; D008954:Models, Biological; D018978:Molting; D020305:Strigiformes / Q000033:anatomy & histology / Q000254:growth & development; D013623:Tail / Q000033:anatomy & histology*