Opinions from R. M. Owens 2004
- 'Asaphus corycoeus is recombined as Decoroproetus corycoeus'
- 'Aulacopleuracea is corrected as Aulacopleuroidea and belongs to Proetida'
- 'Cornuproetinae belongs to Proetidae'
- 'Madygenia belongs to Rorringtoniidae'
- 'Madygenia communis belongs to Madygenia' according to Ju 1981
- 'Madygenia suavis belongs to Madygenia' according to Petrunina 1975
- 'Neoproetus (Paraproetus) was reranked as Paraproetus and belongs to Cornuproetinae'
- 'Ogmocnemis belongs to Cornuproetinae'
- 'Ogmocnemis irregularis belongs to Ogmocnemis' according to Kielan 1960
- 'Ogmocnemis jaanussoni belongs to Ogmocnemis'
- 'Paraproetus brevifrons belongs to Paraproetus' according to Angelin 1854
- 'Parvigena belongs to Cornuproetinae'
- 'Parvigena putealis belongs to Parvigena'
- 'Proetidae belongs to Proetoidea'
- 'Proetoidea belongs to Proetida'
- 'Proetus beecheri is recombined as Ogmocnemis beecheri'
- 'Proetus brachypygus belongs to Proetus' according to Maar and Nicholson 1888
- 'Proetus brachypygus is recombined as Madygenia brachypyga'
- 'Proetus brachypygus is recombined as Otarion brachypygus' according to Owens 1973
- 'Proetus brachypygus is recombined as Cyphaspis brachypyga' according to Owens 1980
- 'Proetus brachypygus is recombined as Cyphaspis brachypygus' according to Morris 1988
- 'Proetus girvanensis is recombined as Paraproetus girvanensis'
- 'Proetus parvigena is recombined as Parvigena parvigena'
- 'Proetus scanicus belongs to Proetus' according to Olin 1906
- 'Proetus scanicus is recombined as Rorringtonia scanica'
- 'Rorringtonia belongs to Rorringtoniidae'
- 'Rorringtoniidae belongs to Aulacopleuroidea'
- 'Solariproetus belongs to Toernquistiidae'
- 'Solariproetus prosthemesos belongs to Solariproetus'
- 'Solariproetus shichengziensis belongs to Solariproetus' according to Qu 1986
- 'Solariproetus triangularis belongs to Solariproetus' according to Qu 1986
- 'Toernquistiidae belongs to Aulacopleuroidea'
- 'Zetaproetus is a subjective synonym of Rorringtonia'
- 'Zetaproetus michle belongs to Zetaproetus' according to Snajdr 1983
- 'Zetaproetus michle is recombined as Xenocybe michle' according to Pek and Vanek 1989
- 'Zetaproetus michle is a subjective synonym of Rorringtonia scanica'