Cephalopoda - Orthocerida - Choanoceratidae
Parent taxon: Michelinoceratida according to R. H. Flower 1962
Sister taxa: Acrosphaerorthoceras, Aptychopsis, Arionoceratidae, Arterioceras, Badouceras, Baltoceratidae, Bogoslovskya, Brachycycloceratidae, Chicagooceras, Cornuella, Cryptocycloceras, Cycloceras, Dictyoceras, Esopoceras, Folioceras, Garryoceras, Heloceras, Jangziceras, Joldagiroceras, Kentronites, Kionoceratidae, Loxoceras, Mericoceras, Molossus, Murchisoniceras, Naivs, Nebroceras, Neorthoceras, Orthoceratidae, Orthoceratina, Orthodochmiocerataceae, Paradnatoceras, Paramooreoceras, Plicatoceras, Podoliceras, Proteoceratidae, Pseudorthocerataceae, Pseudorthoceratoidea, Pythonoceras, Rhabdites, Rhipsites, Sactorthoceratidae, Sannionites, Sichuanaceras, Sichuanoceratidae, Sphaerorthoceratidae, Sphaerortoceratidae, Subspyroceras, Tartaroceras, Tretoceras, Tripteroceratidae, Trispectes, Uralharuspex, Vericeras, Zhuralevia, Striatoceratidae, Michelinoceratidae, Cycloceratidae, Eskimoceratidae, Allumettoceratidae, Engorthoceratidae
Subtaxa: Choanoceras
Type: Choanoceras
Ecology: nektonic carnivore
Distribution: found only at Slite Beds: Fossils of Hoburgen-type reef limestone (Manten 1971, Table IX) (Silurian of Sweden)