Tawuia
Tawuia is a millimetric disc or sausage-shaped, most likely multicellular macrofossil from the Proterozoic. Stratigraphically, they range from to the early Cambrian.
The fossils are often preserved as organic compressions. They are sometimes considered to represent microbial structures; some authors affiliate them with slime molds. However, Tawuia is instead likely an alga, as sub-cellular structures supporting this have been preserved.