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Aenigmatoceras is a genus of ammonite cephalopods from the Carboniferous of Russia. It is tentatively placed within the family Cravenoceratidae based on similarities with Tympanoceras.

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Cheiloceras is a subglobular to thickly lenticular goniatite with a closed umbilicus from the Upper Devonian and type genus for the Cheiloceratidae.

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Cravenoceratinae is one of two subfamilies of the family Cravenoceratidae. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids.

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Cyclolobidae: Goniatitid Ammonoidea belonging to the Cycloloboidea with thickly discoidal to subgloblar shells with a small but open umbilicus and ammonitic sutures with numerous lobes that have subparallel sides.

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Eothinitidae is one of eleven families of the Neoicoceratoidea superfamily. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids.

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Goniatites is a genus of extinct cephalopods belonging to the family Goniatitidae, included in the superfamily Goniatitaceae. Hibernicoceras and Hypergoniatites are among related genera.

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Goniatites bohemicus is a species of extinct cephalopods belonging to the family Goniatitidae, included in the superfamily Goniatitaceae.

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Goniatites crenistria is a species of extinct cephalopods belonging to the family Goniatitidae, included in the superfamily Goniatitaceae.

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Goniatitidae is one of three families included in the ammonoid cephalopod superfamily Goniatitoidea, known from the Lower Mississippian to the Upper Permian. They have sutures that form 8 lobes and characteristically lack sculpture. The ventral lobe, as for the superfamily, is bifurcated.

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Goniatitina is one of two suborders included in the order Goniatitida; extinct Paleozoic ammonoid cephalopods only distantly related to the Nautiloidea.

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Goniatitinae is one of six subfamilies into which the Goniatitidae is subdivided according to Miller, Furnish, and Schindewolf, 1957. The diagnostic character is the narrow bifurcated ventral lobe of the suture, which lies along the outer rim. As with the inclusive Goniatitidae, sutures have eight lobes, shells are without prominent ornament, umbilici are small to moderate in size.

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Goniatitoidea, formerly Goniatitaceae in older publications, is a superfamily of late Paleozoic ammonoid cephalopods included in the Goniatitida. They are characterized by thinly discoidal to globular shells with variable umbilici and sculpture. The ventral lobe, located along the outer margin, is prominently bifurcated ; the lateral lobe undivided.

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Metalegoceras is an extinct genus of marine cephalopods belonging to the family Schistoceratidae.

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Metalegoceras sundaicum is an extinct species of marine invertebrate animals belonging to the family Schistoceratidae.

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Metalegoceratidae is one of eleven families of the Neoicoceratoidea superfamily. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids.

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Neoicoceratoidea, formerly called Neoicocerataceae, is one of seventeen superfamilies of the Goniatitina suborder. Neoicoceratoidea comprises forms previously included in the Neoioceratidae and Metalegoceratidae, previously included in the Goniatitacae. These, along with new families defined for certain genera, including one from the Schistoceratidae, have been recombined as the Neoicocerataceae.

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Prionoceras is an extinct genus of ammonites. It lived during the Devonian period. Prionoceras divisum is the type specimen from the Fichtel Mountains. Specimens have been found in Algeria, China, Germany, Kazakhstan, Morocco, and Poland.

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Prionoceratidae is one of seven families of the superfamily Prionoceratoidea, a member of the Goniatitida order. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids.

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Welleritidae is one of five families of the Schistoceratoidea superfamily. They are an extinct group of ammonoids, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids.