Temporal range: Middle Jurassic
Megasphaeroceras is an ammonite genus included in Sphaeroceratidae, a family of ammonoid cephalopods characterized by their sphaeroidal shells with markedly eccentric coiling, fine ribbing, and complex sutures, known from the lower middle Jurassic.
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- Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology. 363: 1–560. Archived from the original on May 7, 2008. Retrieved 2008-04-05.
- C. Teichert (1964). R.C. Moore, ed. Part K, Mollusca 3. Treatise on Invertebrate Paleontology. Lawrence, Kansas: Geological Society of America and University of Kansas Press. p. K190–K216.
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