Quick Identification Gallery

Taxononomic Index

Kingdom Animalia

Phylum Mollusca

Class Cephalopoda

Subclass Nautiloidea

Order Nautilida

• Superfamily Nautilaceae
  • Family Nautilidae
    • Eutrephoceras nebrascensis (Meek and Hayden)  (South Dakota) 
    • Eutrephoceras cf. clementinum (d'Orbigny)  (England) 
    • Eutrephoceras dekayi (Morton)  (Tennessee and Maryland) 
    • Eutrephoceras campbelli (Meek)   (Texas) 
  • Family Cymatoceratidae
    • Rhyncholite (possible nautiloid "hood", or possible jaw apparatus)   (Texas) 
    • Cymatoceras hilli (Shattuck)  (Texas) 
    • Paracymatoceras texanum (Shumard)  (Texas) 

The classification scheme is based on several authors:

• Miller, A. K.; Harris, R. A. 1945. North American Cymatoceratidae (Mesozoic Nautiloidea). Journal of Paleontology 19 (1), 1–13.
• Richards, H. G.  1962.  The Cretaceous Fossils of New Jersey, Part 2.  New Jersey Geological Survey Bulletin 61.
• Stephenson, L. W.  1941.  The Larger Invertebrate Fossils of the Navarro Group of Texas (Exclusive of Corals and Crustaceans, and Exclusive of the Fauna of the Escondido Formation).  University of Texas Bulletin 4101.