700-Million-Year-Old Fossils: Oldest Armored Creature?
Fossils of tiny creatures living hundreds of millions of years ago may represent the oldest example of an organism with its own mineral coating such as is seen today on snails. The fossils indicate that the simple microorganisms were covered in plates with teethlike spines — an evolutionary feature that puzzles scientists.
700-Million-Year-Old Fossils: Oldest Armored Creature? | 3-D Images of Microfossils | Evolution of Earliest Complex Life | LiveScience