Having no hard parts, it might be expected that fossil tadpoles would not exist.
However, traces of biofilms have been preserved and fossil tadpoles have been found dating back to the Miocene.
Tadpoles are eaten in some parts of the world and are mentioned in folk tales and used as a symbol in ancient Egyptian numerals.
Shangdong Province, China
39mm tadpole on 99mm slab from one of the very few places in the world where fossils of tadpoles have ever been found