Opinions from R. Zangerl 1981
- 'Acondylacanthus belongs to Ctenacanthidae'
- 'Agassizodus belongs to Agassizodontidae'
- 'Anaclitacanthus belongs to Ctenacanthoidea'
- 'Antliodus belongs to Petalodontida'
- 'Arctacanthus belongs to Ctenacanthoidea'
- 'Arpagodus belongs to Agassizodontidae'
- 'Asteroptychius belongs to Ctenacanthoidea'
- 'Bandringa belongs to Bandringidae'
- 'Bandringidae belongs to Ctenacanthoidea'
- 'Bobbodus belongs to Eugeneodontidae'
- 'Bobbodus schaefferi belongs to Bobbodus'
- 'Bradyodontida belongs to Chondrichthyes'
- 'Bransonella belongs to Xenacanthidae'
- 'Calopodus belongs to Petalodontida'
- 'Campodus belongs to Caseodontoidea'
- 'Campyloprion belongs to Agassizodontidae'
- 'Carinacanthus belongs to Ctenacanthoidea'
- 'Caseodontidae belongs to Caseodontoidea'
- 'Caseodontoidea belongs to Elasmobranchii'
- 'Caseodus belongs to Caseodontidae'
- 'Caseodus eatoni belongs to Caseodus'
- 'Chiastodus belongs to Caseodontoidea'
- 'Chimaeridae belongs to Chimaerina'
- 'Chimaerina belongs to Bradyodontida'
- 'Chomatodus belongs to Petalodontida'
- 'Chondrenchelyidae belongs to Chondrichthyes'
- 'Cladodus hassiacus belongs to Cladodus' according to Gross 1937
- 'Cladodus hassiacus is a nomen dubium'
- 'Cladodus wildungensis belongs to Cladodus' according to Jaekel 1921
- 'Cladodus wildungensis is a nomen dubium'
- 'Cladoselache belongs to Cladoselachidae'
- 'Cladoselachida belongs to Elasmobranchii'
- 'Cladoselachidae belongs to Cladoselachida'
- 'Cobelodus belongs to Symmoriidae'
- 'Cochliodontidae belongs to Chimaerina'
- 'Copodontidae belongs to Bradyodontida'
- 'Coronodontida belongs to Elasmobranchii'
- 'Coronodus belongs to Coronodontida'
- 'Cratoselache belongs to Ctenacanthidae'
- 'Ctenacanthidae belongs to Ctenacanthoidea'
- 'Ctenacanthoidea belongs to Euselachii'
- 'Ctenacanthus belongs to Ctenacanthidae'
- 'Ctenoptychius belongs to Petalodontida'
- 'Dabasacanthus belongs to Hybodontoidea'
- 'Deltodontidae belongs to Chimaerina'
- 'Deltoptychiidae belongs to Chimaerina'
- 'Deltoptychius belongs to Deltoptychiidae'
- 'Denaea belongs to Symmoriidae'
- 'Desmiodus belongs to Desmiodontida'
- 'Diacranodus belongs to Xenacanthidae'
- 'Diademodus belongs to Coronodontida'
- 'Diplodoselachidae belongs to Xenacanthida'
- 'Edestidae belongs to Edestoidea'
- 'Edestoidea belongs to Eugeneodontida'
- 'Edestus belongs to Edestidae'
- 'Elasmobranchii belongs to Chondrichthyes'
- 'Erikodus belongs to Caseodontidae'
- 'Eugeneodontida belongs to Elasmobranchii'
- 'Eugeneodontidae belongs to Caseodontoidea'
- 'Eugeneodus belongs to Caseodontidae'
- 'Eugeneodus richardsoni belongs to Eugeneodus'
- 'Euselachii was reranked as a order and belongs to Elasmobranchii'
- 'Fadenia belongs to Caseodontidae'
- 'Fissodus belongs to Petalodontida'
- 'Gilliodus orvellei belongs to Gilliodus'
- 'Gilliodus peyeri belongs to Gilliodus'
- 'Glyphanodus belongs to Petalodontida'
- 'Goodrichthys belongs to Ctenacanthidae'
- 'Harpacodus belongs to Petalodontida'
- 'Helicampodus belongs to Edestidae'
- 'Helicoprion belongs to Agassizodontidae'
- 'Helicoprion ivanovi is recombined as Campyloprion ivanovi'
- 'Helodontidae belongs to Holocephali'
- 'Hercynolepis belongs to Orodontidae'
- 'Heteropetalus belongs to Desmiodontida'
- 'Holmesella belongs to Protacrodontoidea'
- 'Holocephali was reranked as a superorder and belongs to Chondrichthyes'
- 'Hybodontoidea belongs to Euselachii'
- 'Iniopera belongs to Sibyrhynchidae'
- 'Iniopterygia belongs to Subterbranchialia'
- 'Iniopterygidae belongs to Iniopterygia'
- 'Iniopteryx belongs to Iniopterygidae'
- 'Inioxyele belongs to Sibyrhynchidae'
- 'Janassa belongs to Petalodontida'
- 'Jimpohlia belongs to Bradyodontida'
- 'Leiodus belongs to Orodontidae'
- 'Lestrodus belongs to Edestidae'
- 'Lisgodus belongs to Petalodontida'
- 'Lophodus belongs to Orodontidae'
- 'Megactenopetalus belongs to Pristodontidae'
- 'Menaspidae belongs to Chimaerina'
- 'Menaspis belongs to Menaspidae'
- 'Menaspis armata belongs to Menaspis'
- 'Mesodmodus belongs to Orodontidae'
- 'Mesolophodus belongs to Petalodontida'
- 'Monocladodus belongs to Cladoselachidae'
- 'Onychoselache belongs to Hybodontoidea'
- 'Ornithoprion belongs to Caseodontidae'
- 'Orodontida belongs to Elasmobranchii'
- 'Orodontidae belongs to Orodontida'
- 'Orodus belongs to Orodontidae'
- 'Orodus basalis is recombined as Caseodus basalis'
- 'Orodus greggi belongs to Orodus'
- 'Orodus micropterygius belongs to Orodus'
- 'Orthacanthus belongs to Xenacanthidae'
- 'Paracymatodus belongs to Petalodontida'
- 'Parahelicampodus belongs to Edestidae'
- 'Parahelicoprion belongs to Agassizodontidae'
- 'Peripristis belongs to Pristodontidae'
- 'Petalodopsis tripartitis belongs to Petalodopsis' according to Davis 1833
- 'Petalodopsis tripartitis belongs to Petalodopsis'
- 'Petalodus belongs to Petalodontida'
- 'Petalorhynchus belongs to Petalodontida'
- 'Phoebodontidae belongs to Ctenacanthoidea'
- 'Phoebodus belongs to Phoebodontidae'
- 'Platyacanthus belongs to Xenacanthidae'
- 'Pleuracanthus belongs to Xenacanthidae'
- 'Polyrhizodus belongs to Petalodontida'
- 'Polysentor belongs to Polysentoridae'
- 'Pristodontidae belongs to Petalodontida'
- 'Pristodus belongs to Pristodontidae'
- 'Promexyele belongs to Iniopterygidae'
- 'Protacrodus belongs to Protacrodontoidea'
- 'Psephodontidae belongs to Bradyodontida'
- 'Romerodus belongs to Caseodontidae'
- 'Romerodus orodontus belongs to Romerodus'
- 'Sarcoprion belongs to Agassizodontidae'
- 'Serratodus belongs to Petalodontida'
- 'Sibyrhynchidae belongs to Iniopterygia'
- 'Sibyrhynchus belongs to Sibyrhynchidae'
- 'Similihariotta belongs to Chimaeridae'
- 'Sphenacanthus serrulatus belongs to Sphenacanthus'
- 'Squatinactida belongs to Elasmobranchii'
- 'Squatinactis belongs to Squatinactida'
- 'Stethacanthidae belongs to Symmoriida'
- 'Stethacanthus belongs to Stethacanthidae'
- 'Subterbranchialia belongs to Chondrichthyes'
- 'Symmoriida belongs to Elasmobranchii'
- 'Symmoriidae belongs to Symmoriida'
- 'Symmorium belongs to Symmoriidae'
- 'Syntomodus belongs to Edestidae'
- 'Tamiobatis vetustus is a nomen dubium'
- 'Tanaodus belongs to Petalodontida'
- 'Toxoprion belongs to Agassizodontidae'
- 'Trichorhipis belongs to Hybodontoidea'
- 'Triodus belongs to Xenacanthidae'
- 'Tristychius belongs to Hybodontoidea'
- 'Wodnika belongs to Ctenacanthoidea'
- 'Xenacanthida belongs to Elasmobranchii'
- 'Xenacanthidae belongs to Xenacanthida'
- 'Xenacanthus belongs to Xenacanthidae'