Polymerolepis dates back 420 million years ago based on fossilized preserved placoid scales. This indicates that Polymerolepis was one of the earliest sharks.
Family:
Genus: †Polymerolepis
Species:
Phylum– Chordata
Class– Chondrichthyles
Genus– †Polymerolepis
Status: EXTINCT. Late Silurian. Fossil representation: Placoid scales.The placoid scales of Polymerolepis date back 420 million years, indicating that Polymerolepis was one of the earliest sharks. Unfortunately no other remains are known so it is impossible to say what Polymerolepis looked like. Two other shark ancestors from the same time period are Mongolepis and Elegestolepis.
Demographic, Distribution, Habitat, Environment and Range: Mongolia.
Diet: Research suggests a carnivore, yet that is not confirmed.