Hiatellidae - Rock Borers

Hiatellidae, the rock borers, have oblong, irregular shaped shells, usually with wavy concentric growth lines. They commonly bore into sponges, corals and limestone. Some like to burrow into soft substrates. This family includes the Pacific geoduck (pronounce goo-ee-duck) that is the largest American clam. Its shell reaches 9 inches and its siphon may stretch to 2 feet. There are 2 species of Hiatellidae found in Texas.