Ikaria wariootia bilaterian, illustration
Illustration of the Ikaria wariootia bilaterian. This worm-like animal is the earliest bilaterian to be discovered and lived over 550 million years ago in South Australia. Ikaria warioota bilaterian measured between 2 and 7 millimetres long and burrowed in sand on the ocean floor., by CLAUS LUNAU/SCIENCE PHOTO LIBRARY
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