Arctoceras
Encyclopedia
Arctoceras is a ceratitid
ammonoid genus from the Lower Triassic with a moderately narrow discoidal shell and ceratitic suture.
The shell of Arctoceras is generally involute with compressed whorls that are much higher than wide, flattened sides, narrowly rounded ventral rim, and sutures with wide low saddles and simple serrated lobes.
Arctoceras was named by Hyatt, (1900). The genotype Arctoceras polaris (Mojsisovics) comes from Spitsbergen. Arctoceras is the type genus of the Arctoceratidae which is a family in the Meekocerataceae, a superfamily within the Ceratitida. Ceratitids are ammonoid cephalopods, mostly from the Triassic but with ancestral forms in the Upper Permian. Meekocerataceae sometimes appears as Meekoceratoidea to conform with a recent ruling of the ICZN
regarding superfamily endings.
Arctoceras has been reported from Canada, the United States, Russia, Australia, Afghanistan, and Malaysia.
Ceratitida
The 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....
ammonoid genus from the Lower Triassic with a moderately narrow discoidal shell and ceratitic suture.
The shell of Arctoceras is generally involute with compressed whorls that are much higher than wide, flattened sides, narrowly rounded ventral rim, and sutures with wide low saddles and simple serrated lobes.
Arctoceras was named by Hyatt, (1900). The genotype Arctoceras polaris (Mojsisovics) comes from Spitsbergen. Arctoceras is the type genus of the Arctoceratidae which is a family in the Meekocerataceae, a superfamily within the Ceratitida. Ceratitids are ammonoid cephalopods, mostly from the Triassic but with ancestral forms in the Upper Permian. Meekocerataceae sometimes appears as Meekoceratoidea to conform with a recent ruling of the ICZN
International Commission on Zoological Nomenclature
The International Commission on Zoological Nomenclature is an organization dedicated to "achieving stability and sense in the scientific naming of animals". Founded in 1895, it currently comprises 28 members from 20 countries, mainly practicing zoological taxonomists...
regarding superfamily endings.
Arctoceras has been reported from Canada, the United States, Russia, Australia, Afghanistan, and Malaysia.