Coilopoceratidae Hyatt, 1903
Key morphological features: Involute shell which is either flat-sided or with slight rounding. Broad, low-relief ribs are found in pairs. Suture lines have narrow saddles and shallow lobes.
MOBILITY: Mobile (swim)
FEEDING MODE: Predator
Wright, C. W., 1996. Ammonoidea, in Kaesler, R. L., ed., Treatise on Invertebrate Paleontology, Part L, Mollusca 4 Revised, Volume 4. The University of Kansas and Geological Society of America. 362 pp.