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Temporal range: Middle Jurassic
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Family: Sonniniidae
Genus: Newmarracarroceras

Newmarracarroceras is an ammonite from the early middle Jurassic[1] with a ribbed subinvolute shell with a keel running along the venter, or outer rim. The ubilicus is moderately wide, exposing the inner whorls exposed in part.

Newmarracarroceras has a fairly wide geographic range and includes species previously described under Fontannesia. Related genera include Asthenoceras, Fontannesia, Guhsania, and Witchellia.


  1. ^ Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology 364: p.560. Retrieved 2008-04-05. 
  • The Paleobiology Database Newmarracarroceras entry
  • Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.