Parent taxon: Hyolitha according to D. L. Bruton and D. A. T. Harper 2000
See also Fisher 1962, Malinky 1990, Malinky and Racheboeuf 2011, Sepkoski 2002, Valent 2004 and Wotte 2006
Sister taxa: Attenuella, Hyolithomorpha, Orthothecida, Orthothecimorpha, Toxeumorphorida
Subtaxa: Aimitus Aladracina Altaicornus Amydaicornus Anabaricornus Angusticornidae Angusticornus Atdabanithidae Australothecidae Bolithes Borealicornus Brevilabiatus Carinolithidae Cavernolites Crestjahitidae Decipilites Doescherina Emarites Erraticornus Firmicornus Galicornus Glossolites Gompholites Goniocornus Grantitheca Hyolithidae Hyolithina Hyptiotheca Ingolitotheca Insignicornus Insolitotheca Jacuticornus Jacutolitus Jincelites Joachimilites Ketemecornus Kuonamkicornus Lathamoserpens Laticornus Lenalitus Lirotheca Matthevina Maxilites Meitanovitus Nelegerocornidae Nitoricornus Notabilitus Oblisicornus Oxytus Paracornus Parakolithes Parakorilithes Parentilitidae Parkula Patholites Pauxillites Pauxillitidae Rarissimetus Rodentilites Similothecidae Slapylitidae Tajinella Tizilites Tulenicornus Virgatotheca Yacutolithuus
Ecology: facultatively mobile epifaunal suspension feeder