Temporal range: Bajocian
Fissilobiceras is similar to Shirbuirnia, except primarily for being more involute and having complex sutures. More of the inner whorls show in Shirbuirnia and its sutures are simple. Fissilobiceras also has a low keel running along the venter and only a small part of the inner whorls are exposed in the small umbilicus.
This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. (July 2014) (Learn how and when to remove this template message)
- Arkell et al., 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology Part L, Ammonoiea. Geological Society of America and University of Kansas Press.
- Jack Sepkoski's Online Genus Database, 2002 
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