Medlicottiaceae

Systematic Paleontology Class Cephalopoda Subclass Ammonoidea Order Prolecanitida Superfamily Medlicottiaceae

The Medlicottiaceae, or Medlicottioidea as renamed, is a superfamily within the ammonoid order Prolecanitida, shells of which are discoidal or thinly lenticular with a flattened or grooved outer rim. Umbilici are small, ventrolateral nodes or ribs are common. Sutures have a modified first lateral lobe or saddle, or both, and form a series of undivided or bifid auxiliary lobes. [1]

Medlicottianceans have a stratigraphic range that extends from the Upper Mississippian to the Lower Triassic; to the Upper Triassic if the Sageceratidae is included [1]

At one time [1] the Medlicottiaceae included three families, the Pronoritidae which ranges from the Upper Mississippian to the Middle Permian, the Medlicottiidae ranging from the Lower Pennsylvanian to the Lower Triassic, and the Sageceratidae ranging from the Lower to the Upper Triassic.

The Medlicottiaceae now includes the Darvasiceratidae, Medlicottiidae, Pronoritidae, Shikhanitidae, and Sundaitidae. The Sageceratidae has been removed and is now included in the Ceratitida. [2]

References [1] Treatise on Invertebrate Paleontology, Part L, 1957. pp L71-L74 [2] Medlicottioidea Karpinsky 1889