Nostoceratidae Hyatt, 1894
Key morphological features: Shell has a very spiral shape, but can be irregular. Ribbing is prominant and may have extra projections. Suture lines are intricate.
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.