Temporal range: Mississippian–Lower Triassic
The Medlicottiaceae are recognized by their discoidal to thinly lenticular, and involute shells with small umbilici; flat, often grooved venters, and variably complex sutures. Medlicottiacean shells are often more ornamented and may sport ventrolateral nodes or ribs.
The Medlicottiaceae combines two related families, the ancestral Pronoritidae, descended from the Prolecanitidae in the Upper Mississippian and the derived Medlicottiadae which first appeared in the Lower Pennsylvanian. A third family, the Sageceratidae, considered to be derived from the Medlicottiadae, is included in the Ceratitida in more recent classifications.
The Medlicottiaceae have become known by the alternative Medlicottiodea, following the recent ruling by the ICZN regarding superfamily endings. Medlicottiaceae nevertheless has a long standing in the literature with the taxonomic rank clear, without the need for explanation.[original research?]
- Miller, Furnish, and Schindewolf, 1957; Paleozoic Ammonoidea, esp superfamily Medlicottiaceae, L71, in The Treatise on Invertebrate Paleontology, Part L, Ammonoidea.
- Saunders and Work; Abstract: Evolution of shell morphology and suture complexity in Paleozoic prolecanitids.....