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- Actinoceratidae abstract "Actinoceriatidae is a family of actinocerids named by Saemann in 1853 for those that grew to have large shells with blunt apecies and large siphuncles with widely expanded segments and a generally arcuate endosiphucular canal system. Their range is from the upper Middle Ordovician to the Lower Silurian. Actinocerids are generally straight shelled nautiloid cephalopods with a siphuncle composed of expanded segments, typically with thin connecting rings, in which there are internal deposits penetrated by a system of canalsActinoceratids are derived from Wutinoceras, possibly through an early Armenoceras or through Nybyoceras and give rise to Lambeoceras and to the Huroniidae. Seven genera are included in the Actinoceratidae, Actinoceras, Floweroceras, Kochoceras, Leurorthoceras, Paractinoceras, Saffordoceras, and Troostoceras. Actinoceras is the earliest but with a range that carries it into the Lower Silurian. Troostoceras followed by Saffordoceras are later Middle Ordovician genera related to early Actinoceras. Kochoceras followed by Floweroceras are Upper Ordovian genera related to later Actinoceras. Leurothoceras and Paractinoceras, both from the Upper Ordovician, are shown to have their source in Middle Ordovician actinoceratids. Paractinoceras is probably the most distinct actinoceratid from Actinoceras. Paractinoceras has a long, straight slender shell and a siphuncle that starts off like that in Actinoceras but becomes narrow like that in Ormoceras in the anterior part of the phragmocone. Kochoceras has a large blunt shell that expands more rapidly than Actinoceras and is strongly flattened on the ventral side causing possible confusion with Lambeoceras to casual observation. Floweroceras is doubtfully distinct from Kochoceras.Leurothoceras is synonymous with Actinoceras; Saffordoceras and Troostoceras are closely related.".
- Actinoceratidae class Cephalopod.
- Actinoceratidae class Nautiloid.
- Actinoceratidae kingdom Animal.
- Actinoceratidae order Actinocerida.
- Actinoceratidae phylum Mollusca.
- Actinoceratidae wikiPageID "24595677".
- Actinoceratidae wikiPageRevisionID "590473449".
- Actinoceratidae classis "Cephalopoda".
- Actinoceratidae familia "Actonoceratidae".
- Actinoceratidae familiaAuthority "Saemann".
- Actinoceratidae fossilRange "Middle Ordovician - Lower Silurian".
- Actinoceratidae hasPhotoCollection Actinoceratidae.
- Actinoceratidae ordo Actinocerida.
- Actinoceratidae phylum Mollusca.
- Actinoceratidae regnum "Animalia".
- Actinoceratidae subclassis Nautiloid.
- Actinoceratidae subdivision "see text".
- Actinoceratidae subdivisionRanks "Genera".
- Actinoceratidae subject Category:Nautiloids.
- Actinoceratidae subject Category:Ordovician_animals.
- Actinoceratidae subject Category:Silurian_animals.
- Actinoceratidae type Animal100015388.
- Actinoceratidae type LivingThing100004258.
- Actinoceratidae type Object100002684.
- Actinoceratidae type OrdovicianAnimals.
- Actinoceratidae type Organism100004475.
- Actinoceratidae type PhysicalEntity100001930.
- Actinoceratidae type SilurianAnimals.
- Actinoceratidae type Whole100003553.
- Actinoceratidae type Animal.
- Actinoceratidae type Eukaryote.
- Actinoceratidae type Mollusca.
- Actinoceratidae type Species.
- Actinoceratidae type Mollusk.
- Actinoceratidae type Organism.
- Actinoceratidae comment "Actinoceriatidae is a family of actinocerids named by Saemann in 1853 for those that grew to have large shells with blunt apecies and large siphuncles with widely expanded segments and a generally arcuate endosiphucular canal system. Their range is from the upper Middle Ordovician to the Lower Silurian.".
- Actinoceratidae label "Actinoceratidae".
- Actinoceratidae sameAs m.080q6fw.
- Actinoceratidae sameAs Q15728112.
- Actinoceratidae sameAs Q15728112.
- Actinoceratidae sameAs Actinoceratidae.
- Actinoceratidae wasDerivedFrom Actinoceratidae?oldid=590473449.
- Actinoceratidae isPrimaryTopicOf Actinoceratidae.