Opinions from C. H. C. Brunton and C. Champion 1974
- 'Acanthocrania belongs to Craniacea'
- 'Acrotretida belongs to Inarticulata'
- 'Ambocoeliidae belongs to Cyrtiacea'
- 'Athyridacea belongs to Spiriferida'
- 'Athyrididae belongs to Athyridacea'
- 'Athyridinae belongs to Athyrididae'
- 'Avonia belongs to Overtoniidae'
- 'Avonia (Quasiavonia) belongs to Avonia'
- 'Cardiarinidae belongs to Rhynchonellacea'
- 'Cleiothyridina belongs to Athyridinae'
- 'Coledium belongs to Stenoscismatidae'
- 'Craniacea belongs to Acrotretida'
- 'Crurithyris belongs to Ambocoeliidae'
- 'Cyrtiacea belongs to Spiriferida'
- 'Cyrtina belongs to Cyrtinidae'
- 'Cyrtinidae belongs to Suessiacea'
- 'Davidsoniacea belongs to Strophomenida'
- 'Dielasmatacea belongs to Terebratulida'
- 'Dielasmatidae belongs to Dielasmatacea'
- 'Echinoconchidae belongs to Productacea'
- 'Fusella belongs to Spiriferidae'
- 'Girtyella belongs to Dielasmatidae'
- 'Hustedia belongs to Retziidae'
- 'Lambdarina belongs to Lambdarininae'
- 'Lambdarininae belongs to Cardiarinidae'
- 'Overtoniidae belongs to Productacea'
- 'Pleuropugnoides belongs to Wellerellidae'
- 'Productoidea is corrected as Productacea and belongs to Strophomenida'
- 'Pustula belongs to Echinoconchidae'
- 'Retziacea belongs to Spiriferida'
- 'Retziidae belongs to Retziacea'
- 'Rhynchonellacea belongs to Rhynchonellida'
- 'Rhynchonellida belongs to Articulata'
- 'Schuchertella belongs to Schuchertellidae'
- 'Schuchertellidae belongs to Davidsoniacea'
- 'Spiriferacea belongs to Spiriferida'
- 'Spiriferellina belongs to Spiriferinidae'
- 'Spiriferida belongs to Articulata'
- 'Spiriferidae belongs to Spiriferacea'
- 'Spiriferinacea belongs to Spiriferida'
- 'Spiriferinidae belongs to Spiriferinacea'
- 'Stegacanthia belongs to Echinoconchidae'
- 'Stenoscismatacea belongs to Rhynchonellida'
- 'Stenoscismatidae belongs to Stenoscismatacea'
- 'Strophomenida belongs to Articulata'
- 'Suessiacea belongs to Spiriferida'
- 'Terebratulida belongs to Articulata'
- 'Wellerellidae belongs to Rhynchonellacea'