Opinions from C. D. Walcott 1905
- 'Acrothele minuta belongs to Acrothele'
- 'Acrothele rarus belongs to Acrothele'
- 'Acrothyra minor belongs to Acrothyra'
- 'Acrotreta attenuata belongs to Acrotreta'
- 'Acrotreta bisecta belongs to Acrotreta' according to Matthew 1901
- 'Acrotreta bisecta belongs to Acrotreta'
- 'Acrotreta cancellata belongs to Acrotreta'
- 'Acrotreta eggegrundensis belongs to Acrotreta' according to Wiman 1903
- 'Acrotreta eggegrundensis belongs to Acrotreta'
- 'Acrotreta emmonsi belongs to Acrotreta'
- 'Acrotreta liani belongs to Acrotreta'
- 'Acrotreta neboensis belongs to Acrotreta'
- 'Acrotreta nox belongs to Acrotreta'
- 'Acrotreta pacifica belongs to Acrotreta'
- 'Acrotreta shantungensis belongs to Acrotreta'
- 'Acrotreta spinosa belongs to Acrotreta'
- 'Acrotreta uplandensis belongs to Acrotreta' according to Wiman 1903
- 'Acrotreta uplandensis belongs to Acrotreta'
- 'Anomites lenticularis is recombined as Orthis (Orusia) lenticularis'
- 'Anomites lenticularis is recombined as Orthis lenticularis' according to Matthew 1891
- 'Billingsella (Otusia) belongs to Billingsella'
- 'Billingsella anomala belongs to Billingsella'
- 'Billingsella appalachia belongs to Billingsella'
- 'Billingsella dice belongs to Billingsella'
- 'Billingsella exporrecta rugosicostata belongs to Billingsella exporrecta'
- 'Billingsella harlanensis belongs to Billingsella'
- 'Billingsella major belongs to Billingsella'
- 'Billingsella obscura belongs to Billingsella'
- 'Billingsella plicatella belongs to Billingsella'
- 'Billingsella pumpellyi belongs to Billingsella'
- 'Billingsella richthofeni belongs to Billingsella'
- 'Billingsella saffordi belongs to Billingsella'
- 'Billingsella striata belongs to Billingsella'
- 'Camerella antiquata belongs to Camerella' according to Billings 1861
- 'Camerella antiquata is recombined as Swantonia antiquata'
- 'Curticia elegantula belongs to Curticia'
- 'Dicellomus appalachia belongs to Dicellomus'
- 'Dicellomus parvus belongs to Dicellomus'
- 'Elkania bellula belongs to Elkania'
- 'Gonambonites plana retroflexa belongs to Gonambonites plana' according to de Verneuil 1830
- 'Gonambonites plana retroflexa is recombined as Billingsella retroflexa' according to Matthew 1903
- 'Gonambonites plana retroflexa is recombined as Orthis (Plectorthis) retroflexa'
- 'Iphidea sculptilis is recombined as Iphidella sculptilis'
- 'Iphidella belongs to Brachiopoda'
- 'Iphidella labradorica orientalis belongs to Iphidella labradorica'
- 'Iphidella labradorica utahensis belongs to Iphidella labradorica'
- 'Iphidella major belongs to Iphidella'
- 'Iphidella nisus belongs to Iphidella'
- 'Kutorgina was reranked as Obolella (Kutorgina) and belongs to Obolella' according to Billings 1861
- 'Kutorgina labradorica is recombined as Iphidella labradorica'
- 'Kutorgina labradorica swantonensis is recombined as Iphidella labradorica swantonensis'
- 'Kutorgina latourensis belongs to Kutorgina' according to Matthew 1886
- 'Kutorgina latourensis is recombined as Protorthis latourensis'
- 'Kutorgina perugata belongs to Kutorgina'
- 'Kutorgina prospectensis is recombined as Iphidella prospectensis'
- 'Kutorgina sardiniaensis belongs to Kutorgina'
- 'Kutorgina whitfieldi is recombined as Billingsella whitfieldi'
- 'Lingula bottnica belongs to Lingula' according to Wiman 1903
- 'Lingula bottnica is recombined as Obolus (Westonia) bottnica'
- 'Lingula polita is recombined as Dicellomus politus'
- 'Lingulella fuchsi is recombined as Obolus (Lingulella) fuchsi'
- 'Lingulella wanniecki belongs to Lingulella' according to Redlich 1899
- 'Lingulella wanniecki is recombined as Obolus (Lingulella) wanniecki'
- 'Lingulepis was reranked as Obolus (Lingulepis) and belongs to Obolus'
- 'Lingulepis matinalis belongs to Lingulepis' according to Hall 1863
- 'Lingulepis matinalis is recombined as Obolus matinalis'
- 'Nisusia (Jamesella) belongs to Nisusia'
- 'Nisusia (Jamesella) amii belongs to Nisusia (Jamesella)'
- 'Nisusia (Jamesella) argenta belongs to Nisusia (Jamesella)'
- 'Nisusia (Jamesella) erecta belongs to Nisusia (Jamesella)'
- 'Nisusia (Jamesella) utahensis belongs to Nisusia (Jamesella)'
- 'Obolella (Kutorgina) cingulata belongs to Obolella (Kutorgina)' according to Billings 1861
- 'Obolella (Kutorgina) cingulata is recombined as Kutorgina cingulata'
- 'Obolella asiatica belongs to Obolella'
- 'Obolella circe belongs to Obolella' according to Billings 1872
- 'Obolella circe is recombined as Quebecia circe'
- 'Obolella nana is recombined as Dicellomus nanus'
- 'Obolus (Lingulella) chinensis belongs to Obolus (Lingulella)'
- 'Obolus (Lingulella) damesi belongs to Obolus (Lingulella)'
- 'Obolus (Lingulella) isse belongs to Obolus (Lingulella)'
- 'Obolus (Lingulella) orus belongs to Obolus (Lingulella)'
- 'Obolus (Lingulella) pelias belongs to Obolus (Lingulella)'
- 'Obolus (Lingulella) quadrilateralis belongs to Obolus (Lingulella)'
- 'Obolus (Lingulella) septalis belongs to Obolus (Lingulella)'
- 'Obolus (Lingulella) upis belongs to Obolus (Lingulella)'
- 'Obolus (Lingulepis) eros belongs to Obolus (Lingulepis)'
- 'Obolus (Lingulepis) rowei belongs to Obolus (Lingulepis)'
- 'Obolus (Westonia) alandensis belongs to Obolus (Westonia)'
- 'Obolus (Westonia) baltica belongs to Obolus (Westonia)'
- 'Obolus (Westonia) blackwelderi belongs to Obolus (Westonia)'
- 'Obolus (Westonia) iphis belongs to Obolus (Westonia)'
- 'Obolus (Westonia) themis belongs to Obolus (Westonia)'
- 'Obolus (Westonia) wimani belongs to Obolus (Westonia)'
- 'Obolus acadica belongs to Obolus'
- 'Obolus ismene belongs to Obolus'
- 'Obolus minimus belongs to Obolus'
- 'Obolus nundina belongs to Obolus'
- 'Obolus obscurus belongs to Obolus'
- 'Obolus pectenoides belongs to Obolus' according to Whitfield 1875
- 'Obolus pectenoides is recombined as Dicellomus pectenoides'
- 'Obolus pheres belongs to Obolus'
- 'Obolus shensiensis belongs to Obolus'
- 'Obolus tetonensis belongs to Obolus'
- 'Obolus tetonensis ninus belongs to Obolus tetonensis'
- 'Orthis (Finkelnburgia) belongs to Orthis'
- 'Orthis (Finkelnburgia) finkelnburgi belongs to Orthis (Finkelnburgia)'
- 'Orthis (Finkelnburgia) osceola belongs to Orthis (Finkelnburgia)'
- 'Orthis (Finkelnburgia) osceola corrugata belongs to Orthis (Finkelnburgia) osceola'
- 'Orthis (Orusia) belongs to Orthis'
- 'Orthis (Plectorthis) daunus belongs to Orthis (Plectorthis)'
- 'Orthis (Plectorthis) desmopleura nympha belongs to Orthis (Plectorthis) desmopleura'
- 'Orthis (Plectorthis) diablo belongs to Orthis (Plectorthis)'
- 'Orthis (Plectorthis) doris belongs to Orthis (Plectorthis)'
- 'Orthis (Plectorthis) hastingsensis belongs to Orthis (Plectorthis)'
- 'Orthis (Plectorthis) iddingsi belongs to Orthis (Plectorthis)'
- 'Orthis (Plectorthis) indianola belongs to Orthis (Plectorthis)'
- 'Orthis (Plectorthis) kayseri belongs to Orthis (Plectorthis)'
- 'Orthis (Plectorthis) pagoda belongs to Orthis (Plectorthis)'
- 'Orthis (Plectorthis) papias belongs to Orthis (Plectorthis)'
- 'Orthis (Plectorthis) remnicha sulcata belongs to Orthis (Plectorthis) remnicha'
- 'Orthis (Plectorthis) remnicha texana belongs to Orthis (Plectorthis) remnicha'
- 'Orthis (Plectorthis) remnicha winfieldensis belongs to Orthis (Plectorthis) remnicha'
- 'Orthis (Plectorthis) tullbergi belongs to Orthis (Plectorthis)'
- 'Orthis (Plectorthis) wichitaensis belongs to Orthis (Plectorthis)'
- 'Orthis (Plectorthis) wichitaensis laeviusculus belongs to Orthis (Plectorthis) wichitaensis'
- 'Orthis (Plectorthis) wimani belongs to Orthis (Plectorthis)'
- 'Orthis barabuensis belongs to Orthis' according to Winchell 1864
- 'Orthis barabuensis is recombined as Syntrophia barabuensis'
- 'Orthis billingsi belongs to Orthis' according to Hartt 1868
- 'Orthis billingsi is recombined as Protorthis billingsi'
- 'Orthis christianiae is recombined as Orthis (Plectorthis) christianiae'
- 'Orthis coloradoensis is recombined as Billingsella coloradoensis'
- 'Orthis desmopleura belongs to Orthis' according to Meek 1872
- 'Orthis desmopleura is recombined as Orthis (Plectorthis) desmopleura'
- 'Orthis eurekensis is recombined as Orthis (Orusia) eurekensis'
- 'Orthis exporrecta belongs to Orthis' according to Linnarsson 1876
- 'Orthis exporrecta is recombined as Billingsella exporrecta'
- 'Orthis hicksi belongs to Orthis' according to Davidson 1868
- 'Orthis hicksi is recombined as Billingsella hicksi'
- 'Orthis highlandensis is recombined as Billingsella highlandensis'
- 'Orthis kuthani belongs to Orthis' according to Pompeckj 1896
- 'Orthis kuthani is recombined as Nisusia (Jamesella) kuthani'
- 'Orthis lenticularis atrypoides belongs to Orthis lenticularis' according to Matthew 1891
- 'Orthis lenticularis atrypoides is recombined as Orthis (Orusia) lenticularis atrypoides'
- 'Orthis lenticularis lyncioides is recombined as Orthis (Orusia) lenticularis lyncioides'
- 'Orthis lenticularis lyncioides belongs to Orthis lenticularis' according to Matthew 1891
- 'Orthis lindstromi belongs to Orthis' according to Linarsson 1876
- 'Orthis lindstromi is recombined as Billingsella lindstromi'
- 'Orthis linnarssoni belongs to Orthis' according to Kayser 1883
- 'Orthis linnarssoni is recombined as Orthis (Plectorthis) linnarssoni'
- 'Orthis newtonensis belongs to Orthis' according to Weller 1903
- 'Orthis newtonensis is recombined as Orthis (Plectorthis) newtonensis'
- 'Orthis perpasta is recombined as Nisusia (Jamesella) perpasta'
- 'Orthis perpasta macra belongs to Orthis perpasta' according to Pompeckj 1896
- 'Orthis perpasta macra is recombined as Nisusia (Jamesella) perpasta macra'
- 'Orthis perpasta subquadrata belongs to Orthis perpasta' according to Pompeckj 1896
- 'Orthis perpasta subquadrata is recombined as Nisusia (Jamesella) perpasta subquadrata'
- 'Orthis quacoensis belongs to Orthis' according to Matthew 1886
- 'Orthis quacoensis is recombined as Protorthis quacoensis'
- 'Orthis remnicha is recombined as Orthis (Plectorthis) remnicha'
- 'Orthis romingeri is recombined as Billingsella romingeri'
- 'Orthis salemensis belongs to Orthis' according to Walcott 1887
- 'Orthis salemensis is recombined as Billingsella salemensis'
- 'Orthis saltensis belongs to Orthis' according to Kayser 1876
- 'Orthis saltensis is recombined as Orthis (Plectorthis) saltensis'
- 'Orthis sandbergi belongs to Orthis' according to Winchell 1886
- 'Orthis sandbergi is recombined as Billingsella (Otusia) sandbergi'
- 'Orthisina alberta is recombined as Nisusia alberta'
- 'Orthisina festinata is recombined as Nisusia festinata'
- 'Orthisina johannensis belongs to Orthisina' according to Matthew 1891
- 'Orthisina johannensis is recombined as Orthis (Plectorthis) johannensis'
- 'Orthisina orientalis belongs to Orthisina' according to Whitfield 1884
- 'Orthisina orientalis is recombined as Billingsella orientalis'
- 'Orthisina transversa belongs to Orthisina' according to Walcott 1886
- 'Orthisina transversa is recombined as Nisusia festinata transversa'
- 'Plectorthis was reranked as Orthis (Plectorthis) and belongs to Orthis'
- 'Polytoechia montanensis belongs to Polytoechia'
- 'Protorthis (Loperia) belongs to Protorthis'
- 'Protorthis (Loperia) dougaldensis belongs to Protorthis (Loperia)'
- 'Protorthis helena belongs to Protorthis'
- 'Protorthis laevis belongs to Protorthis'
- 'Protorthis nautes belongs to Protorthis'
- 'Protorthis nunnebergensis belongs to Protorthis'
- 'Protorthis spencei belongs to Protorthis'
- 'Protorthis wingi belongs to Protorthis'
- 'Rustella edsoni belongs to Rustella'
- 'Schuchertina cambria belongs to Schuchertina'
- 'Strophomena (Eostrophomena) belongs to Strophomena'
- 'Strophomena (Eostrophomena) elegantula belongs to Strophomena (Eostrophomena)'
- 'Strophomena atava belongs to Strophomena' according to Matthew 1893
- 'Strophomena atava is recombined as Orthis (Plectorthis) atava'
- 'Swantonia weeksi belongs to Swantonia'
- 'Syntrophia abnormis belongs to Syntrophia'
- 'Syntrophia alata belongs to Syntrophia'
- 'Syntrophia billingsi belongs to Syntrophia'
- 'Syntrophia nundina belongs to Syntrophia'
- 'Syntrophia orientalis belongs to Syntrophia'
- 'Syntrophia primordialis argia belongs to Syntrophia primordialis'
- 'Syntrophia rotundata belongs to Syntrophia'
- 'Syntrophia texana belongs to Syntrophia'
- 'Syntrophia texana laeviusculus belongs to Syntrophia texana'
- 'Triplesia primordialis belongs to Triplesia' according to Whitfield 1877
- 'Triplesia primordialis is recombined as Syntrophia primordialis'