Alternative spellings: Hyolithis, Hyolithus
Synonym: Theca Morris 1845
Full reference: E. d'Eichwald. 1840. Ueber das silurische Schichtensystem in Esthland. Aus dem ersten and zweiten Hefte der Zeithschrift für Natur und Heilkunde der medizinischen Akademi zu St. Petersburg besonders abgedruckt 1-210
Parent taxon: Hyolithida according to E. Landing and K.E. Bartowski 1996
Sister taxa: Aimitus, Altaicornus, Amydaicornus, Anabaricornus, Angusticornidae, Angusticornus, Atdabanithes, Australothecidae, Borealicornus, Brevilabiatus, Cavernolites, Crestjahitidae, Decipilites, Doescherina, Elegantilites, Emarites, Erraticornus, Firmicornus, Galicornus, Gompholites, Goniocornus, Grantitheca, Haplophrentis, Hyolithidae, Hyolithina, Hyptiotheca, Ingolitotheca, Insignicornus, Insolitotheca, Jacuticornus, Jacutolitus, Joachimilites, Ketemecornus, Kuonamkicornus, Laticornus, Lenalitus, Lirotheca, Matthevina, Meitanovitus, Nelegerocornidae, Neopauxillites, Nitoricornus, Notabilitus, Oblisicornus, Oboedalites, Oxytus, Paracornus, Parakolithes, Parakorilithes, Parkula, Patholites, Pauxillites, Pauxillitidae, Planotheca, Rarissimetus, Rodentilites, Similothecidae, Slapylites, Tajinella, Tizilites, Tulenicornus, Virgatotheca, Virgulaxonaria, Yacutolithuus, Yankongovitus
Subtaxa: Hyolithes (Pharetrella), Hyolithes aclis, Hyolithes acutus, Hyolithes aliger, Hyolithes americanus, Hyolithes amosi, Hyolithes aplatus, Hyolithes asteroideus, Hyolithes cariniferus, Hyolithes cecrops, Hyolithes columbanus, Hyolithes conularioides, Hyolithes daphnis, Hyolithes delia, Hyolithes endoi, Hyolithes fuchouensis, Hyolithes gibbosus, Hyolithes girvanensis, Hyolithes hathewayi, Hyolithes immemor, Hyolithes kuantungensis, Hyolithes mantouensis, Hyolithes minutissimus, Hyolithes multicinctus, Hyolithes multipunctatus, Hyolithes ornatellus, Hyolithes paishanensis, Hyolithes penkillensis, Hyolithes sondai, Hyolithes tenuis, Hyolithus (Hyolithus), Hyolithus mimicus, Hyolithus pallidus, Theca kirkbyi
Type: Hyolithes acutus