The Reudemannoceratidae are the ancestral and most primitive of the Discosorida, an order of cephalopods from the early Paleozoic. The Reudemannoceratidae...

Evolution within the order begins with the lower Middle Ordovician Reudemannoceratidae and from there diverges into three main lineages. Questionable discosorids...

of species. Franklinoceras is an early discosorid from the family Reudemannoceratidae, similar to the ancestral Reudemannoceras. Both are from the early...

The Cyrtogomphoceratidae are derived from the discosorid family Reudemannoceratidae, probably from Reudemannoceras, through the ancestral genus Ulrichoceras...

Glenister, suggests inclusion in the Cyrtogomphoceratidae, or ancestral Reudemannoceratidae; however endosiphuncular deposits are otherwise lacking in both these...

dorsal part of the shell. The Mandaloceratidae are derived from the Reudemannoceratidae through Madiganella. The earliest mandeloceratid is Pseudogomphoceras...

common with Lambeoceras and Gonioceras, but reassigned it to the Reudemannoceratidae (Discosorida) noting that neither (siphuncular) annuli or parispatium...