Apleuroceras is a genus of ceratitid ammonites with an essentially smooth evolute shell with a subquadrade whorl section and a ceratitic suture with two lateral lobes. Apleuroceras belongs to the Aplococeratidae and has been found in middle Triassic formations of Ladinian age in Hungary and the Alps.
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.
Anasirenites is a genus of extinct ammonoid cephalopods within the family Trachyceratidae which is part of the ceratitid superfamily Clydonitaceae; sometimes considered a subgenus of Sirenites. Anasirenites is characterized by a ventral furrow bordered on either side by a continuous keel. The shell, as for Sirenites, is compressed with whorls flattened-convex on the sides. Sigmoidal ribs on the flanks bifurcate near the ventro-lateral shoulder on tubercles and project sharply adorally. Whorl sides are tuberculate with tubercles arranged in spiral lines. The suture is ammonitic. Anasirenites, first described by Mojsisovics in 1893 is known from the Upper Triassic of the Alps, Sicily, and the Himalaya.
Anotoceras is a genus of smooth shelled, discoidal ammonites with a depressed, subtrigonal whorl section and ceratitic sutures included in the ceratitid family Otoceratidae.
Arctoprionites is a genus of extinct ammonites (s.l.) from the Triassic, belonging to the ceratitid family Prionitidae. It has been found in Canada in British Columbia, in Japan, Kazakhstan, and in the U.S. in Nevada.
Balkanites is a genus of extinct ammonites (s.l.), belonging to the ceratitid superfamily Ceratitacea and family Tirolitidae. It is restricted to the Triassic period. As common to the family, the shell is evolute with lateral tubercles. The suture is not elaborate.
Bacchites is a genus of extinct ammonoid cephalopods belonging to the ceratitid family Juvavitidae.
Frechites is an early Triassic ammonite, a kind of cephalopod with an external shell, included in the ceratitid family Beyrichitidae.
Frankites is an extinct genus of cephalopods from the Triassic period included in the Trachyceratidae, a family of mostly evolute ammonites, coiled so as all whorls are showing, and commonly ornamented with flexious, tuberculate ribs. Related genera include Anolcites, Daxatina, and Trachyceras.
Ussuria is a genus of Lower Triassic ammonites with a smooth, involute discoidal shell with submonophyllic sutures, belonging to the ceratitid family Ussuriidae.
Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as well as ancestral forms from the Upper Permian, the exception being the phylloceratids which gave rise to the great diversity of post-Triassic ammonites.
Noritoidea, formerly Noritaceae, is an extinct superfamily of cephalopods belonging to the Ammonite order Ceratitida.
Araxoceratidae is an extinct family of ceratitid ammonites, cephalopods that were found throughout the world. They arose during the Permian and died out during the early Triassic. The species of the type genus Araxoceras are used as markers for various Permian epochs.
Ptychitoidea, formerly Ptychitacheae, is a superfamily of typically involute, subglobular to discoidal Ceratitida in which the shell is smooth with lateral folds or striations, inner whorls are globose, and the suture is commonly ammonitic. Their range is Middle_ and Upper Triassic.
The Haloritidae is a family of subglobular, involute, Triassic ammonoids belonging to the ceratitid superfamily Tropitoidea. Their shells may be smooth or may have ribs that cross or are interrupted on the venter, and may have nodes. Keels and ventral furrows are not typical. The last volution is commonly eccentric. The Suture may be ammonitic, ceratitic, or goniatitic.
The Ptychitidae is a family of ceratitid ammonites. They are combined with the Eosagenitidae and Sturiidae in the superfamily Ptychitoidea.
Pseudosirenites is a genus of Upper Triassic ammonites belonging to the ceratitid family Trachyceratidae, like Sirenites, but with a narrow outer rim (venter) that has a nodose keel on either side.
The Hungaritidae comprises a family of ceratitid ammonites described in the Treatise,(Arkell et al. 1957), as involute compressed, discoidal, with keeled or sharpened venter, smooth to weakly costate. Sutures ceratitid, usually with numerous elements.
The Meekoceratidae is a family of ceratitid ammonites described in the Treatise on Invertebrate Paleontology, as being more or less involute, compressed, discoidal, smooth to weakly ornamented; venter arched or tabulate; sutures ceratitic with broad saddles. Now includes four subfamilies.
Sturia is a genus of ceratitid ammonoids from the Lower Triassic with an ammonitic suture.
