Polysacos

Polysacos is an extinct 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.^[1] It was fringed with a ring of hollow spines resembling those of the Ordovician Echinochiton.^[1]

Polysacos Temporal range: 335  Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Polyplacophora
Order:	†Multiplacophora
Genus:	†Polysacos Vendrasco et al., 2004
Species:	†P. vickersianum
Binomial name
†Polysacos vickersianum Vendrasco et al., 2004