Opinions from J. Pojeta and B. Runnegar 1976
- 'Anisotechnophorus belongs to Technophoridae'
- 'Apotocardium belongs to Bransoniidae'
- 'Arceodomus belongs to Conocardiidae'
- 'Bigalea belongs to Hippocardiidae'
- 'Bigalea ohioensis belongs to Bigalea'
- 'Bigalea visbyensis belongs to Bigalea'
- 'Bigalea yangi belongs to Bigalea'
- 'Bransonia belongs to Bransoniidae'
- 'Bransonia alabamensis belongs to Bransonia'
- 'Bransonia cressmani belongs to Bransonia'
- 'Bransonia wilsoni belongs to Bransonia'
- 'Bransoniidae belongs to Conocardioidea'
- 'Cardium alaeforme is recombined as Conocardium aliforme'
- 'Cardium alaeforme clathratum is recombined as Bigalea clathra'
- 'Cardium elongatum is recombined as Conocardium elongatum'
- 'Cardium hibernicum is recombined as Hippocardia hibernica'
- 'Cardium pygmaeum is recombined as Hippocardia pygmaea'
- 'Conocardiidae belongs to Conocardioidea'
- 'Conocardioida belongs to Rostroconchia'
- 'Conocardioidea belongs to Conocardioida'
- 'Conocardium belongs to Conocardiidae'
- 'Conocardium beecheri is recombined as Bransonia beecheri'
- 'Conocardium bellum is recombined as Hippocardia bella'
- 'Conocardium blumenbachium is recombined as Euchasma blumenbachi'
- 'Conocardium bohemicum is recombined as Hippocardia bohemica'
- 'Conocardium denticulatum is recombined as Mulceodens denticulatus'
- 'Conocardium glabratum is recombined as Arceodomus glabrata'
- 'Conocardium isbergi is recombined as Bransonia isbergi'
- 'Conocardium langenheimi is recombined as Arceodomus langenheimi'
- 'Conocardium lanterna is recombined as Pseudoconocardium lanterna'
- 'Conocardium limatula is recombined as Hippocardia limatula'
- 'Conocardium lindstromi is recombined as Bransonia lindstromi'
- 'Conocardium monroense is recombined as Hippocardia monroica'
- 'Conocardium paquettensis is recombined as Bransonia paquettensis'
- 'Conocardium praepristis is recombined as Hippocardia praepristis'
- 'Conocardium pseudobellum belongs to Conocardium'
- 'Conocardium richmondense is recombined as Hippocardia richmondensis'
- 'Conocardium robustum is recombined as Bransonia robustum'
- 'Conocardium zeileri is recombined as Hippocardia zeileri'
- 'Eoischyrinia is corrected as Eoischyrina and belongs to Ischyriniidae'
- 'Eopteria belongs to Eopteriidae'
- 'Eopteria conocardiformis belongs to Eopteria'
- 'Eopteria obsolata belongs to Eopteria'
- 'Eopteria richardsoni belongs to Eopteria'
- 'Eopteria typica is replaced by Eopteria richardsoni'
- 'Eopteriidae belongs to Eopterioidea'
- 'Eopterioidea belongs to Conocardioida'
- 'Euchasma belongs to Eopteriidae'
- 'Euchasma jonesi belongs to Euchasma'
- 'Euchasma mytiliforme belongs to Euchasma'
- 'Heraultia is replaced by Heraultipegma'
- 'Heraultia varensalensis is recombined as Heraultipegma varensalensis'
- 'Heraultipegma belongs to Ribeiriidae'
- 'Hippocardia belongs to Hippocardiidae'
- 'Hippocardia cooperi belongs to Hippocardia'
- 'Hippocardiidae belongs to Conocardioidea'
- 'Ischyrinia belongs to Ischyriniidae'
- 'Ischyrinia norvegica belongs to Ischyrinia'
- 'Ischyrinia plicata is recombined as Technophorus plicatus'
- 'Ischyriniinae was reranked as the family Ischyriniidae and belongs to Ischyrinoida'
- 'Ischyrinoida belongs to Rostroconchia'
- 'Mulceodens belongs to Bransoniidae'
- 'Mulceodens jaanussoni belongs to Mulceodens'
- 'Myocaris belongs to Technophoridae'
- 'Myocaris lutraria belongs to Myocaris'
- 'Myona queenslandica is recombined as Pseudomyona queenslandica'
- 'Oepikila belongs to Ribeiriidae'
- 'Opikella is replaced by Oepikila'
- 'Opikella cambrica is recombined as Oepikila cambrica'
- 'Ozomia lucan is recombined as Ribeiria lucan'
- 'Pinnocaris belongs to Ribeiriidae'
- 'Pinnocaris americana belongs to Pinnocaris'
- 'Pleurorhynchus is an objective synonym of Hippocardia'
- 'Pleurorhynchus antiquus is recombined as Hippocardia antiqua'
- 'Pleurorhynchus cuneus is recombined as Conocardium cuneum' according to J. Hall 1883
- 'Pleurorhynchus cuneus is recombined as Hippocardia cunea'
- 'Pleurorhynchus cuneus is recombined as Conocardium cuneus' according to J. Hall 1855
- 'Pleurorhynchus diptera is recombined as Hippocardia diptera'
- 'Pseudoconocardium belongs to Bransoniidae'
- 'Pseudoconocardium licharewi belongs to Pseudoconocardium'
- 'Pseudotechnophorus belongs to Ischyriniidae'
- 'Pterinea crassa is recombined as Eopteria crassa'
- 'Ribeirella is a subjective synonym of Technophorus'
- 'Ribeirella crassa is recombined as Ribeiria crassa'
- 'Ribeirella sharpei is recombined as Technophorus sharpei'
- 'Ribeiria apusoides belongs to Ribeiria'
- 'Ribeiria australiensis belongs to Ribeiria'
- 'Ribeiria calcifera belongs to Ribeiria'
- 'Ribeiria compressa belongs to Ribeiria'
- 'Ribeiria nuculitiformis is recombined as Anisotechnophorus nuculitiformis'
- 'Ribeiria personata belongs to Ribeiria'
- 'Ribeiria pholadiformis belongs to Ribeiria'
- 'Ribeiria taylori belongs to Ribeiria'
- 'Ribeiria ventricosa is recombined as Eopteria ventricosa'
- 'Ribeirina belongs to Ribeiriidae'
- 'Technophoridae belongs to Ribeirioida'
- 'Technophorus belongs to Technophoridae'
- 'Technophorus divaricatus belongs to Technophorus'
- 'Technophorus milleri belongs to Technophorus'
- 'Technophorus stoermeri is a subjective synonym of Technophorus sharpei'
- 'Technophorus subacutus belongs to Technophorus'
- 'Tolmachovia belongs to Technophoridae'
- 'Tolmachovia concentrica belongs to Tolmachovia'
- 'Tolmachovia jelli belongs to Tolmachovia'
- 'Wanwanella belongs to Eopteriidae'
- 'Wanwania belongs to Ribeiriidae'
- 'Wanwanoidea belongs to Eopteriidae'
- 'Watsonella crosbyi belongs to Watsonella'