定义 中文名称: 羽枝 英文名称: pinnule 定义: 由腕板侧方长出的羽状枝骨,活体海百合为食物沟所在位置。 应用学科: 古生物学(一级学科); 古无脊椎动物学(二级学科); 棘皮动物门(二级学科)
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沿着羽轴伸展开去的较小的杆状物叫做羽枝,沿着羽枝伸展开去的更小的细丝则叫小羽枝。
Branching from the rachis are smaller shafts called barbs, and then branching from the barbs are even smaller filaments called barbules.
但这件标本没有羽轴,带状尾巴上只有羽枝和小羽枝。
But this specimen lacked the rachis; it just had barbs and barbules down its ribbonlike tail.
该发现表明,羽毛中的羽枝和小羽枝是先于羽轴进化出来的。
The finding suggests that the barbs and barbules evolved before the rachis in feathers.
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