» Class Scaphopoda    Information from the Animal Diversity Web on these molluscs, their habitat, systematic and taxonomic history, physical description, reproduction and behavior.    http://animaldiversity.ummz.umich.edu/site/accounts/information/Scaphopoda.html

» Introduction to the Scaphopoda    Information about biology of the tusk shells, with illustrations and links.    http://www.ucmp.berkeley.edu/mollusca/scaphs/scaphopoda.html

» The Scaphopod Page    Information and resources pertaining to research on scaphopods and other molluscan taxa.    http://academics.hamilton.edu/biology/preynold/Scaphopoda/

» Tusk Shell    Information from Wikipedia on tusk shells of the class Scaphopoda, their classification, description, habitat, distribution, anatomy and fossil record.    http://en.wikipedia.org/wiki/Scaphopoda