此外,本文还研究了道虎沟生物群中翼龙身上发育的皮肤衍生物,初步认为它们是原始羽毛(protofeathers),至少是与羽毛同源的(feather-homologous),这对于了解羽毛(广义)的演化历史和早期的形态结构将具有十分重要的意义.
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除了原始羽毛，这块9900万年前的琥珀还将软组织和8节完整的椎骨保存了下来。
Along with the primitive plumage, the 99-million-year-old amber also preserved soft tissue and eight complete vertebrae.
麦凯乐博士发现的羽毛化石不全是非常原始的。
Not all the feathers found by Dr McKellar were so primitive, though.
最原始的羽毛是单纤维，类似于刚毛，从爬行动物的皮肤上突出来。
Feathers in their most primitive form were single filaments, resembling quills, that jutted from reptilian skin.
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