Acanthinites is a genus of extinct cephalopods belonging to the ammonoid order Ceratitida described by Mojsisovics in 1893 who established the type species of the group as Acanthinites excelsus. The Shell is involute, compressed; sides arched, converging on narrow venter with a central furrow bordered by low serrated keels. Flanks are covered by numerous spiral rows of tubercles.
Acrochordiceras is a genus of Middle Triassic ammonoid cephalopods belonging to the ceratitid family Acrochordiceratidae, included in the superfamily Ceratitoidea.
Anatropites is a genus of ammonite in the ceratitid family Tropitidae with spines instead of nodes on the umbilical shoulder, at least in early whorls. Ceratitids are mostly Triassic ammonoid cephalopods.
Arcestes is a genus of extinct ceratitid ammonites found in Triassic-aged marine strata.
Arctoceras is a genus of ceratitid ammonoids from the Lower Triassic with a moderately narrow discoidal shell and ceratitic suture.
Ussuria is a genus of Lower Triassic ammonites with a smooth, involute discoidal shell with submonophyllic sutures, belonging to the ceratitid family Ussuriidae.
Xenodiscoidea, formerly Xenodiscaceae, is a superfamily within the ammonoid order Ceratitida. The superfamily was named by Frech in 1902, presently contains ten families, only one of which was included in the original Otocerataceae of Hyatt, 1900, the remaining having been added.
The Ophiceratidae is a family in the ammonoid order Ceratitida from the Lower Triassic, previously included in the Otocerataceae but now placed in the Noritiaceae as revised.
Clydonitoidea, formerly Clydonitaceae, is a superfamily in the ammonoid cephalopod order Ceratitida characterized by generally costate and turberculate shells with smooth, grooved, or keeled venters and sutures that are commonly ceratitic or ammonitic but goniatic in a few offshoots.
The Trachyceratidae is an extinct family of ceratitid ammonoid cephalopods.
Paratirolites is a genus of Early Triassic ceratites from Armenia and Iran with distinct ribs, prominent ventro-lateral tubercles, and a broadly arched venter. The suture is ceratitic with a large ventral saddle. Ceratites are ammonoid cephalopods that lived during the Late Permian and Triassic.
Gymnitidae is a family of Lower to Middle Triassic ammonite cephalopods with evolute, discoidal shells.
Subbalhaeceras is a genus of ammonites which existed in what is now Russia during the Olenekian. It was described by Yuri D. Zakharov and Nasrin Mousavi Abnavi in 2012, and the type species is S. shigetai. The generic name means "nearly Balhaeceras", referring to the external resemblance the ammonite bears to the other genus, while the species epithet honours Yasunari Shigeta, of the National Museum of Nature and Science in Tsukuba, Japan.
Mantelliceras is an extinct ammonoid cephalopod genus belonging to the family Acanthoceratidae and type for the Mantelliceratinae, that lived from the Late Albian to the late Cenomanian stage of the Late Cretaceous.
Dieneria is a genus of ceratitid ammonoid cephalopods from the Late Triassic of western North America with a smooth discoidal shall of which the venter is truncate and the suture simple. Only the first lateral lobe is slightly serrated, the other lobes entire (smooth)
Ophiceras is a genus of smooth, evolute ceratitid ammonites from the Early Triassic, with a rounded venter. Fossils of the genus have been found in Armenia, Azerbaijan, China, Greenland, and India.
Meekoceras is a genus of ceratitid ammonites with a discoidal shell that lived during the Early Triassic Epoch.
Clypeoceras is a genus of ammonites with an involute discoidal shell from the Lower Triassic.
Neocardioceras is a genus of evolute acanthoceratid ammonites from the uppermost Cenomanian, Upper Cretaceous, of Europe, western U.S. and Brazil.
Quenstedtoceras is a genus of ammonoid cephalopods that lived during the latter part of the Jurassic period in what is now France, Poland, Germany, and the United Kingdom.
