Vernanimalcula

Vernanimalcula guizhouena is a fossil believed by some to represent the earliest known member of the Bilateria (animals with bilateral symmetry). It is known from deposits dating to 600 to 580 million years ago. The fossils are between 0.1 and 0.2 mm across (roughly the width of one or two human hairs). Vernanimalcula means "small spring animal", referring to its appearance in the fossil record at the end of the Marinoan Glaciation (see also Snowball Earth).