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15 relations: Actinocerida, Animal, Armenoceratidae, Cephalopod, Chazy Formation, Elrodoceras, Mollusca, Monocyrtoceras, Nautiloid, Nybyoceras, Ordovician, Selkirkoceras, Silurian, Type genus, Wutinoceras.
Actinocerida
The Actinocerida comprise an order of generally straight, medium to large cephalopods that lived during the early and middle Paleozoic, distinguished by a siphuncle composed of expanded segments that extend into the adjacent chambers, in which deposits formed within contain a system of radial canals and a narrow space along the inner side of the connecting ring known as a paraspatium.
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Animal
Animals are multicellular eukaryotic organisms that form the biological kingdom Animalia.
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Armenoceratidae
The Armenoceratidae are a family of early Paleozoic nautiloid cephalopods belonging to the order Actinocerida.
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Cephalopod
A cephalopod is any member of the molluscan class Cephalopoda (Greek plural κεφαλόποδα, kephalópoda; "head-feet") such as a squid, octopus or nautilus.
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Chazy Formation
The Chazy Reef Formation is a mid-Ordovician limestone deposit in northeastern North America.
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Elrodoceras
Elrodoceras is a genus of armenoceratids, (Cephalopoda, Actinocerida), that grew fairly large, characterized by a straight shell, slightly curved at the apex, a siphuncle narrower than that of Armenoceras but with segments still wider than long, and an arched endosiphuncular canal system.
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Mollusca
Mollusca is a large phylum of invertebrate animals whose members are known as molluscs or mollusksThe formerly dominant spelling mollusk is still used in the U.S. — see the reasons given in Gary Rosenberg's.
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Monocyrtoceras
Monocyrtoceras is a genus of armenoceratids (Cephalopoda) from the Middle Silurian of North America (Wisconsin), with a gently curved shell and a siphuncle like that of Elrodoceras.
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Nautiloid
Nautiloids are a large and diverse group of marine cephalopods (Mollusca) belonging to the subclass Nautiloidea that began in the Late Cambrian and are represented today by the living Nautilus and Allonautilus.
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Nybyoceras
Nybyoceras is an actinocerid genus assigned to the Armenoceratidae and similar to Armenoceras except for having a siphuncle close to the ventral side of the shell.
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Ordovician
The Ordovician is a geologic period and system, the second of six periods of the Paleozoic Era.
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Selkirkoceras
Selkirkoceras is a genus of armonoceratid cephalopods similar to Kochoceras of the Actinoceratidae, but with recumbent septal necks.
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Silurian
The Silurian is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at million years ago (Mya), to the beginning of the Devonian Period, Mya.
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Type genus
In biological classification, especially zoology, the type genus is the genus which defines a biological family and the root of the family name.
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Wutinoceras
Wutinoceras is a genus of now extinct nautiloid cephalopods of the Wutinoceratidae family.
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