• Subclass Nautiloida
  • Order Nautilida
    • Nautilidae
• Subclass Coleoida
  • Order Octopoda
    • Argonautidae
  • Order Sepiida
    • Sepiidae
    • Spirulidae

* At this time, only shelled marine mollusks are included in this classification scheme. The other types of mollusks will be added at a later date.

The above material has been adapted from Dr. Rosenberg's The Encyclopedia of Seashells, published by Robert Halt, Ltd., London, 1992.