这是美丽而又不寻常的“海羽星”(Crinoid sp.),这些古老的无脊椎动物的首次出现是在恐龙出现前约 3 亿年的化石记录中。 https://t.co/J2MGMwTrCP https://video.twimg.com/ext_tw_video/1788582426756947968/pu/vid/avc1/1280x720/I1ezDY9PXM66ApZl.mp4?tag=12

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