"This is a bizarre genus of bivalves in which the mantle (which is translucent and covered with papillae) permanently extends from the shell and covers the outside of the valves just like a cowrie snail."
Comment from Richard Willan
This is a bizarre genus of bivalves in which the mantle (which is translucent and covered with papillae) permanently extends from the shell and covers the outside of the valves just like a cowrie snail.