English: Diagram showing the stages of feather evolution as outlined by Xu & Gou 2009.
Single filament
Multiple filaments joined at their base
Multiple filaments joined at their base to a central filament
Multiple filaments along the length of a central filament
Multiple filaments arising from the edge of a membranous structure
Pennaceous feather with vane of barbs and barbules and central rachis
Pennaceous feather with an asymmetrical rachis
Undifferentiated vane with central rachis
Xu, X. and Guo, Y. (2009). The origin and early evolution of feathers: insights from recent paleontological and neontological data. Vertebrata PalAsiatica 47 (4): 311-329.
omistamine – Pead materjali sobival viisil autorile omistama, tooma ära litsentsi lingi ja märkima ära, kas on tehtud muudatusi. Sobib, kui teed seda mõistlikul viisil, kuid seejuures ei tohi jääda muljet, et litsentsiandja tõstab esile sind või seda, et sina materjali kasutad.
sarnaselt jagamine – Kui töötled, kujundad ümber või arendad materjali edasi, siis pead oma töö levitamiseks kasutama sama litsentsi, mille all on algupärand, või ühilduvat litsentsi.
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{{Information |Description={{en|1=Diagram showing the stages of feather evolution as outlined by Xu & Gou 2009. # Single filament # Multiple filaments joined at their base # Multiple filaments joined at their base to a central filament # Multiple filamen