Opinions from J. L. Benedetto 2003
- 'Billingsellida belongs to Strophomenata'
- 'Camerella belongs to Camerellidae'
- 'Camerellidae belongs to Camerelloidea'
- 'Camerelloidea belongs to Pentamerida'
- 'Clitambonitidina belongs to Billingsellida'
- 'Clitambonitoidea belongs to Clitambonitidina'
- 'Crossiskenidium belongs to Skenidiidae'
- 'Crossiskenidium stelzneri belongs to Crossiskenidium'
- 'Desmorthis belongs to Plectorthidae'
- 'Desmorthis bifurcata belongs to Desmorthis'
- 'Famatinorthis belongs to Giraldiellidae'
- 'Famatinorthis turneri belongs to Famatinorthis'
- 'Famatinorthis turneri belongs to Famatinorthis' according to Levy and Nullo 1973
- 'Ffynnonia belongs to Platystrophiidae'
- 'Ffynnonia famatinensis belongs to Ffynnonia'
- 'Giraldiellidae belongs to Plectorthoidea'
- 'Hesperonomia belongs to Hesperonomiidae'
- 'Hesperonomia orientalis belongs to Hesperonomia' according to Benedetto 1998
- 'Hesperonomia orientalis belongs to Hesperonomia'
- 'Hesperonomiella belongs to Orthida'
- 'Hesperonomiella arcuata belongs to Hesperonomiella'
- 'Hesperonomiidae belongs to Orthoidea'
- 'Mollesella belongs to Hesperonomiidae'
- 'Mollesella planiventralis belongs to Mollesella'
- 'Monorthis belongs to Orthida'
- 'Monorthis transversa belongs to Monorthis'
- 'Orthambonites riojanus is recombined as Paralenorthis riojanus' according to Levy and Nullo 1973
- 'Orthambonites riojanus is recombined as Paralenorthis riojanus'
- 'Orthida belongs to Rhynchonellata'
- 'Orthidae belongs to Orthoidea'
- 'Orthidina belongs to Orthida'
- 'Orthoidea belongs to Orthidina'
- 'Panderina belongs to Productorthidae'
- 'Panderina ambigua belongs to Panderina'
- 'Paralenorthis belongs to Orthidae'
- 'Paralenorthis riojanus brevis belongs to Paralenorthis riojanus'
- 'Paralenorthis suriensis belongs to Paralenorthis'
- 'Pentamerida belongs to Rhynchonellata'
- 'Pinatotoechia belongs to Tritoechiidae'
- 'Pinatotoechia acantha belongs to Pinatotoechia' according to Benedetto 2001
- 'Pinatotoechia acantha belongs to Pinatotoechia'
- 'Platystrophiidae belongs to Plectorthoidea'
- 'Plectorthidae belongs to Plectorthoidea'
- 'Plectorthoidea belongs to Orthidina'
- 'Porambonitoidea belongs to Syntrophiidina'
- 'Productorthidae belongs to Orthoidea'
- 'Productorthis belongs to Productorthidae'
- 'Productorthis angulensis belongs to Productorthis'
- 'Protorthida belongs to Rhynchonellata'
- 'Protoskenidioides belongs to Skenidiidae'
- 'Rectotrophiinae was reranked as the family Rectotrophiidae and belongs to Porambonitoidea'
- 'Rhynchonellata belongs to Rhynchonelliformea'
- 'Rugostrophia belongs to Tetralobulidae'
- 'Rugostrophia protoandina belongs to Rugostrophia'
- 'Skenidiidae belongs to Skenidioidea'
- 'Skenidioidea belongs to Protorthida'
- 'Skenidioides belongs to Skenidiidae'
- 'Skenidioides kayseri belongs to Skenidioides'
- 'Strophomenata belongs to Rhynchonelliformea'
- 'Suriorthis belongs to Orthidae'
- 'Suriorthis depressus belongs to Suriorthis'
- 'Syntrophiidina belongs to Pentamerida'
- 'Tetralobulidae belongs to Porambonitoidea'
- 'Trigonostrophia belongs to Rectotrophiidae'
- 'Trigonostrophia reversa belongs to Trigonostrophia'
- 'Tritoechia belongs to Tritoechiidae'
- 'Tritoechia mollesensis belongs to Tritoechia'
- 'Tritoechiidae belongs to Clitambonitoidea'