Diestoceratidae

Diestoceratidae is a family in the nautiloid cephalopod order Oncocerida with compressed, straight to faintly endogastic breviconic shells with a marginal siphuncle that contains discrete, irregular actinosphonate deposits.

The Diestoceratidae contains five known genera. They are:
 * Diestoceras
 * Danoceras
 * Dowlingoceras
 * Lyckholmoceras
 * Suttonoceras