W

Araxoceras is an extinct genus of ceratitid ammonites that lived in the Late Permian marine environments of Iran, South China and Japan. The various species had distinctive, angular-cornered shells.

W

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.

W

Arcestidae is an extinct family of ammonite cephalopods.

W

Balatonites is a genus of extinct cephalopods belonging to the ceratitid family Balatonitidae. There are at least four known species: B. balatonicus, B. oyama, B. shoshonensis, and B. zitteli.

W

Beloceratidae is a family of ammonites included in the order Ceratitida.

W

Catenohalorites is an extinct genus of Triassic ammonoids belonging to the family Haloritidae.

W

Ceratites is an extinct genus of ammonite cephalopods. These nektonic carnivores lived in marine habitats in what is now Europe, during the Triassic, from the upper-most Anisian to the lower Ladinian age.

W

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.

W

Ceratitidae is an extinct family of ammonite cephalopods.

W

Chieseiceras is an extinct genus of ammonites in the family of Ceratitidae. Species are known from the Triassic of Hungary, Italy and Switzerland.

W

Clionites is a genus of the clydonitacean family Clionitidae, and its type. The shell is evolute so as to expose all whorls which are covered with generally bifurcating signmoidal ribs. The suture is ceratitid with two lateral lobes.

W

Etoushanocertidae is an extinct family of ceratitid ammonite cephalopods that were restricted to marine strata in Late Permian China.

W

Gymnitidae is a family of Lower to Middle Triassic ammonite cephalopods with evolute, discoidal shells.

W

Halorites is an extinct genus of Triassic ammonoids belonging to the family Haloritidae.

W

Hedenstroemia is an extinct genus of Early Triassic (Olenekian) cephalopods in the ammonoid order Ceratitida. They were nektonic carnivores.

W

Hedenstroemiidae is an extinct family of cephalopods in the ammonoid order Ceratitida. They were nektonic carnivores.

W

Otoceratoidea is an extinct superfamily of ammonite cephalopods in the order Ceratitida.

W

Owenites is a genus of a ammonite from the early Triassic. Its size was only 33mm. It would eat mainly leftovers that it could find. Its shell was a crystal white color.

W

Paraceltites is a genus of ammonoid cephalopods in the ceratitid family Paraceltitidae, known from the Middle and Upper Permian of Sicily, the Alps, Crimea, Texas and Mexico. The shell of Paraceltities is evolute with whorls compressed, venter arched and smooth, sides bearing ribs that slant somewhat forward dorso-ventrally. The suture is simple and goniatitic.

W

Paraceratites is an extinct genus of ammonite cephalopods in the family Ceratitidae.

W

Paraceratites subnodosus is an extinct species of ammonite cephalopods in the family Ceratitidae.

W

Protrachyceras is a genus of ceratitid ammonoid cephalopods belonging to the family Trachyceratidae.

W

Ptychites is an extinct genus of cephalopods belonging to the family Ptychitidae. These nektonic carnivores lived during the Triassic period, from Anisian to Ladinian age.

W

The Ptychitidae is a family of ceratitid ammonites. They are combined with the Eosagenitidae and Sturiidae in the superfamily Ptychitaceae.

W

The Trachyceratidae is an extinct family of ceratitid ammonoid cephalopods.

W

The Xenodiscaceae is a superfamily within the ammonoid order Ceratitida. The Xenodiscaceae, 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.

W

The Xenodiscidae are the earliest of the Ceratitida and comprise Middle and Upper Permian genera characterized by compressed, discoidal, evolute shells with rounded to acute venters and commonly with lateral ribs. Sutures are goniatitic to weakly ceratitic.

W

Xenodiscus is an extinct ammonoid cephalopod genus and one of the earliest ceratites, found in the Upper Permian of northern India and Timor. Xenodiscus is included in the family Xenodiscidae which is part of the ceratite superfamily Xenodiscaceae