Extinct creatures fill a bewildering void in the fossil record
The artistic reconstruction of the yunnanozoan of the Chengjiang biota of the Cambrian shows basket-like pharyngeal skeletons. Credit: Dinghua Yang Research reveals that yunnanozoans are the oldest known stem vertebrates. The new findings answer questions from the fossil record. The baffling gap in the fossil record that would explain the evolution of invertebrates to vertebrates …
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