Opinions from J. M. Malinky 1990
- 'Circotheca belongs to Hyolitha'
- 'Crestjahitidae belongs to Hyolithida'
- 'Crestjahitus belongs to Crestjahitidae'
- 'Crestjahitus compressus belongs to Crestjahitus' according to Syssoiev 1968
- 'Crestjahitus compressus belongs to Crestjahitus'
- 'Crestjahitus ornatus belongs to Crestjahitus' according to Syssoiev 1968
- 'Decoritheca belongs to Novitatidae'
- 'Hallotheca belongs to Hyolithidae'
- 'Hyolitha was reranked as a class and belongs to Mollusca'
- 'Hyolithes aliger belongs to Hyolithes' according to Resser and Endo 1937
- 'Hyolithes aliger belongs to Hyolithes'
- 'Hyolithes aplatus belongs to Hyolithes' according to Resser and Endo 1937
- 'Hyolithes canalis belongs to Hyolithes' according to Resser and Endo 1937
- 'Hyolithes canalis is recombined as Decoritheca canalis' according to Malinky 1987
- 'Hyolithes canalis is recombined as Decoritheca canalis'
- 'Hyolithes cariniferus belongs to Hyolithes' according to Resser and Endo 1937
- 'Hyolithes crebescens is recombined as Linevitus crebescens' according to Qian 1983
- 'Hyolithes crebescens belongs to Hyolithes' according to Resser and Endo 1937
- 'Hyolithes crebescens is recombined as Novakotheca crebescens'
- 'Hyolithes cybele belongs to Hyolithes' according to Walcott 1905
- 'Hyolithes cybele is recombined as Nevadotheca cybele'
- 'Hyolithes daphnis belongs to Hyolithes' according to Resser and Endo 1937
- 'Hyolithes delia belongs to Hyolithes' according to Walcott 1905
- 'Hyolithes delia belongs to Hyolithes'
- 'Hyolithes distortus belongs to Hyolithes' according to Syssoiev 1962
- 'Hyolithes distortus is recombined as Crestjahitus distortus'
- 'Hyolithes endoi belongs to Hyolithes' according to Howell 1946
- 'Hyolithes endoi belongs to Hyolithes'
- 'Hyolithes excellens is recombined as Nevadotheca excellens'
- 'Hyolithes figuratus is recombined as Tuojdachithes figuratus' according to Missarzhevsky 1969
- 'Hyolithes figuratus is recombined as Crestjahitus figuratus'
- 'Hyolithes fuchouensis belongs to Hyolithes' according to Resser and Endo 1937
- 'Hyolithes fuchouensis belongs to Hyolithes'
- 'Hyolithes kuantungensis belongs to Hyolithes'
- 'Hyolithes kuantungensis belongs to Hyolithes' according to Resser and Endo 1937
- 'Hyolithes mantouensis belongs to Hyolithes' according to Resser and Endo 1937
- 'Hyolithes mantouensis belongs to Hyolithes'
- 'Hyolithes paishanensis belongs to Hyolithes' according to Endo 1937
- 'Hyolithes princeps belongs to Hyolithes' according to Billings 1872
- 'Hyolithes princeps is recombined as Nevadotheca princeps'
- 'Hyolithes sondai belongs to Hyolithes' according to Resser and Endo 1937
- 'Hyolithes sondai belongs to Hyolithes'
- 'Hyolithes tenuis belongs to Hyolithes' according to Resser and Endo 1937
- 'Hyolithes whitei belongs to Hyolithes' according to Resser 1938
- 'Hyolithes whitei is recombined as Nevadotheca whitei'
- 'Hyolithida belongs to Hyolitha'
- 'Hyolithidae belongs to Hyolithida'
- 'Linevitus belongs to Hyolitha'
- 'Nevadotheca belongs to Hyolithidae'
- 'Nevadotheca heckeli belongs to Nevadotheca' according to Malinky 1988
- 'Nevadotheca heckeli belongs to Nevadotheca'
- 'Novakotheca belongs to Hyolithidae'
- 'Novitatidae belongs to Orthothecida'
- 'Orthotheca was reranked as Hyolithes (Orthotheca) and belongs to Hyolithes' according to Resser and Endo 1937
- 'Orthotheca belongs to Orthothecidae'
- 'Orthotheca cyrene is recombined as Decoritheca cyrene'
- 'Orthotheca daulis belongs to Orthotheca'
- 'Orthotheca daulis belongs to Orthotheca' according to Walcott 1905
- 'Orthotheca delphus belongs to Orthotheca' according to Resser and Endo 1937
- 'Orthotheca delphus is recombined as Crestjahitus delphus'
- 'Orthotheca delphus is recombined as Hyolithes delphus' according to Resser and Endo 1937
- 'Orthotheca doris belongs to Orthotheca'
- 'Orthotheca doris belongs to Orthotheca' according to Walcott 1905
- 'Orthotheca glabra belongs to Orthotheca' according to Resser and Endo 1937
- 'Orthotheca glabra is recombined as Decoritheca glabrus'
- 'Orthotheca glabra is recombined as Hyolithes glabrus' according to Resser and Endo 1937
- 'Orthothecidae belongs to Orthothecida'
- 'Semielliptotheca belongs to Hyolitha'