Scientists have identified *Ikaria wariootia*, a tiny wormlike creature from 555 million years ago, as the earliest known bilaterian. This discovery from South Australia reveals the origin of bilateral body structure, a key feature in most animals today. The fossil's characteristics and burrowing behavior provide insights into early animal evolution and locomotion.
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Scientists have identified *Ikaria wariootia*, a tiny wormlike creature from 555 million years ago, as the earliest known bilaterian. This discovery from South Australia reveals the origin of bilateral body structure, a key feature in most animals today. The fossil's characteristics and burrowing behavior provide insights into early animal evolution and locomotion.