Ancestor of all animals identified in Australian fossils: A wormlike creature that lived more than 555 million years ago is the earliest bilaterian 

Geologists have discovered the first ancestor on the family tree that contains most animals today, including humans. The wormlike creature, Ikaria wariootia, is the earliest bilaterian, or organism with a front and back, two symmetrical sides, and openings at either end connected by a gut. It was found in Ediacaran Period deposits in Australia and was 2-7 millimeters long, with the largest the size of a grain of rice.

Source: Ancestor of all animals identified in Australian fossils: A wormlike creature that lived more than 555 million years ago is the earliest bilaterian — ScienceDaily

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