How to pronounce“pikaia”in English
IPA/pæɪkɪæ/
Syllablespi·kai·a
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2:54
What few soft tissue fossils we have tend to look like squashed blobs, and blobs are difficult to interpret, even for paleontologists with 3D modelling systems.
We do have a few milestone blobs: Pikaia was long thought to be the ancestor of all vertebrates, but its status isn't universally accepted.
Haikouichthys, Myllokunmingia, and Metaspriggina, all from 520 million years ago, seem to be either early vertebrates or something very close.
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