Franklinoceras
Introduction '''''Franklinoceras''''' is an extinct gensu of cephalopods from the nautiloid order, Discosorida. Nautiloids comprise a subclass of shelled cephalopods that were once diverse and numerous but are now represented by only a handful of species. ''Franklinoceras'' is an early discosorid from the family Reudemannoceratidae, similar to the ancestral '''''Reudemannoceras'''''. Both are from the early Middle Ordovician; both have endogastric cyrtocones, except in ''Franklinoceras'' they are compressed so as to be higher than wide, rather than the other way around as in ''Reudemannoceras'' (Teichert, 1964).
See also * Reudemannoceratidae for further discussion of ''Reudemannoceras'' and ''Franklinoceras''** Discosorida* Nautiloidea** List of nautiloids
References * Teichert, C. (1964). Nautiloidea -Discosorida; ''Treatise on Invertebrate Paleontology'' Part K, Mollusca 3, R.C. Moore (ed) Univ. Kans. press. * Sepkoski, J.J. Jr. (2002). "A compendium of fossil marine animal genera". Sepkoski's Online Genus Database (CEPHALOPODA)