Crassatellidae Férussac, 1822
Key morphological features: Shells are rounded along the front, but some may be more trigonal in shape. Ornamentation may range from smooth to slight ribbing.
MOBILITY: Mobile (burrow)
FEEDING MODE: Suspension Feeder
Cox, L. R. et al. 1969. Bivalvia, in R. C. Moore ed., Treatise on Invertebrate Paleontology, Part N, Mollusca 6, Volume 2. The University of Kansas and Geological Society of America. 1224 pp.