Opinions from F. Nikolaisen 1961
- 'Acanthoparyphinae belongs to Cheiruridae'
- 'Amphion canadensis is recombined as Pliomerops canadensis'
- 'Atractopyge belongs to Cybelinae'
- 'Calymene verrucosa is recombined as Atractopyge verrucosa'
- 'Ceraurus aculeatus is recombined as Paraceraurus aculeatus'
- 'Cheiruridae belongs to Cheirurina'
- 'Cheirurinae belongs to Cheiruridae'
- 'Cheirurus perlongus is recombined as Paraceraurus perlongus'
- 'Cybele brevicauda is recombined as Atractopyge brevicauda'
- 'Cybele grewingki is recombined as Cybele (Cybelella) grewingki' according to Öpik 1937
- 'Atractopyge grewingki is a subjective synonym of Atractopyge dentata'
- 'Cybele kutorgae is recombined as Atractopyge kutorgae'
- 'Cybelella was reranked as Cybele (Cybelella) and belongs to Cybele' according to Öpik 1937
- 'Cybelinae belongs to Encrinuridae'
- 'Cyrtometopella belongs to Cyrtometopinae'
- 'Cyrtometopella askerensis belongs to Cyrtometopella'
- 'Cyrtometopella tumula belongs to Cyrtometopella'
- 'Cyrtometopinae belongs to Cheiruridae'
- 'Deiphoninae belongs to Cheiruridae'
- 'Encrinuridae belongs to Cheirurina'
- 'Encrinurinae belongs to Encrinuridae'
- 'Encrinurus belongs to Encrinurinae'
- 'Entomostracites punctatus is recombined as Encrinurus punctatus'
- 'Hemisphaerocoryphe belongs to Deiphoninae'
- 'Hemisphaerocoryphe inflatus belongs to Hemisphaerocoryphe'
- 'Hemisphaerocoryphe rosenthali is recombined as Cyrtometopella rosenthali'
- 'Nieszkowskia belongs to Acanthoparyphinae'
- 'Nieszkowskia norvegica belongs to Nieszkowskia'
- 'Paraceraurus belongs to Cheirurinae'
- 'Paraceraurus helgoeyensis belongs to Paraceraurus'
- 'Pliomeridae belongs to Cheirurina'
- 'Pliomerinae belongs to Pliomeridae'
- 'Pliomerops belongs to Pliomerinae'
- 'Sphaerexochus cephaloceros is recombined as Nieszkowskia cephalocera'
- 'Sphaerexochus pseudohemicranium is recombined as Hemisphaerocoryphe pseudohemicranium'
- 'Staurocephalinae belongs to Encrinuridae'
- 'Staurocephalus belongs to Staurocephalinae'
- 'Trilobites dentatus belongs to Trilobites' according to Esmark 1833
- 'Trilobites dentatus is recombined as Atractopyge dentata'
- 'Trilobites sphaericus is recombined as Hemisphaerocoryphe sphaericus'