Nautilidae de Blainville, 1825
Key morphological features: The living Nautilus serves as a primary example for this group which has a chambered shell with connecting siphuncle between chambers to control buoyancy. Shells are involute and smooth, sometimes with curvy ornamentation or slight ribbing. Suture lines are stright or slightly curvy.
MOBILITY: Mobile (swim)
FEEDING MODE: Predator
Kummel, B., 1964. Nautiloidea-Nautilida, in Moore, R. C., ed., Treatise on Invertebrate Paleontology, Part K, Mollusca 3, Volume 1. The University of Kansas and Geological Society of America. 362 pp.