Kingdom Animalia Class Polyplacophora Genus †Polysacos | Phylum Mollusca Order †Multiplacophora Species †P. vickersianum | |
Polysacos is a genus of multiplacophorans (chitons) known from articulated Carboniferous fossils; its seventeen shell plates are arranged in three rows, with seven iterated units. It demonstrates that multiplacophora are related to modern polyplacophora. It was fringed with a ring of hollow spines resembling those of the Ordovician Echinochiton.
References
Polysacos Wikipedia(Text) CC BY-SA