They are sedentary animals with a slender, tubular shell open at both ends. The mantle cavity is large, and the mantle wraps around the viscera to form a tube.
Scaphopods have a well-developed foot located at the large end of the shell.
The foot is used for burrowing. Club-like tentacles also extend from the large end of the shell. There is no heart. Scaphopods feed on detritus and protistans, which are captured in mucus secreted by the foot and tentacles. Animal Diversity .