Scaphopods

• Scaphopoda by Peter V. Fankboner (Simon Fraser University, Vancouver BC).
• Introduction to the Scaphopoda (Tusk Shells) by Brian R. Speer (UCMP).
• Bernd Sahlmann's Scaphopod Compendium by Bernd Sahlmann.
• The Scaphopoda (Tusk Shells): University of California Museum of Palaeontology.
• Tusk Shells (Scaphopoda) on wikipedia.