|Nuculanidae, the elongate nut clams, are marine bivalves that have shells with elongate, usually pointed posterior ends (called a rostrum). They may be smooth or ridged. They also have strong V-shaped lateral teeth on either side of their beaks, separated by a circular or triangular shaped depression (the chondrophore). The organism's foot has two lateral flaps that are used for rapid burrowing. Nut clams usually orient themselves with the anterior end up and then move horizontally through the sediment. They eat detritus that is sucked up from the sediment and filtered through their gills. The are 3 species found in Texas.