Lepidopleurida

Lepidopleurida is an order of molluscs belonging to the class Polyplacophora. The order Lepidopleurida is the oldest group of polyplacophoran molluscs Families:
 * Abyssochitonidae
 * †Acutichitonidae
 * Afossochitonidae
 * †Camptochitonidae
 * †Cymatochitonidae
 * †Glyptochitonidae
 * †Gryphochitonidae
 * Hanleyidae
 * †Heterochitonidae
 * †Lekiskochitonidae
 * Leptochitonidae
 * †Llandeilochitonidae
 * †Mesochitonidae
 * Nierstraszellidae
 * †Permochitonidae
 * Protochitonidae