Opinions from A. W. Potter 1990
- 'Anoptambonites myriomorpheus belongs to Anoptambonites'
- 'Austinella belongs to Plaesiomyidae'
- 'Cremnorthidae belongs to Orthacea'
- 'Diochthofera belongs to Orthinae'
- 'Diochthofera conspicua belongs to Diochthofera'
- 'Dolerorthidae belongs to Orthacea'
- 'Elasmothyris limata belongs to Elasmothyris'
- 'Epitomyonia relicina belongs to Epitomyonia'
- 'Eridorthis belongs to Glyptorthinae'
- 'Eripnifera belongs to Rhactorthinae'
- 'Eripnifera praecipitis belongs to Eripnifera'
- 'Glyptorthinae belongs to Dolerorthidae'
- 'Glyptorthis belongs to Glyptorthinae'
- 'Hesperorthinae belongs to Dolerorthidae'
- 'Hesperorthis belongs to Hesperorthinae'
- 'Orthacea belongs to Orthidina'
- 'Orthidae belongs to Orthacea'
- 'Orthidina belongs to Orthida'
- 'Orthinae belongs to Orthidae'
- 'Paralenorthis belongs to Orthinae'
- 'Phragmorthidae was reranked as the subfamily Phragmorthinae and belongs to Cremnorthidae'
- 'Phragmorthis belongs to Phragmorthinae'
- 'Plaesiomyidae belongs to Orthacea'
- 'Plectorthidae belongs to Orthacea'
- 'Plectorthinae belongs to Plectorthidae'
- 'Ptychopleurella belongs to Glyptorthinae'
- 'Rhactorthidae was reranked as the subfamily Rhactorthinae and belongs to Plectorthidae'
- 'Salopina horseshoensis belongs to Salopina'
- 'Scaphorthis belongs to Plectorthinae'
- 'Sigmelasma pantherae belongs to Sigmelasma'
- 'Skenidioides multifarius belongs to Skenidioides'
- 'Taphrorthis belongs to Orthinae'