Opinions from H. J. Harrington and A. F. Leanza 1957
- 'Acadagnostus belongs to Peronopseinae'
- 'Acadagnostus argentinus belongs to Acadagnostus'
- 'Acerocarina belongs to Pelturinae'
- 'Agnostida belongs to Trilobita'
- 'Agnostidae belongs to Agnostina'
- 'Agnostina belongs to Agnostida'
- 'Angelina belongs to Triarthrinae'
- 'Angelina kayseri belongs to Angelina'
- 'Angelina punctolineata belongs to Angelina'
- 'Apatokephalus belongs to Richardsonellinae'
- 'Apatokephalus exiguus belongs to Apatokephalus'
- 'Apatokephalus serratus belongs to Apatokephalus' according to Boeck 1838
- 'Apatokephalus serratus belongs to Apatokephalus'
- 'Araiopleura belongs to Hapalopleuridae'
- 'Araiopleura reticulata belongs to Araiopleura'
- 'Arionellus hyeronimi is recombined as Angelina hyeronimi'
- 'Asaphacea belongs to Asaphina'
- 'Asaphellus belongs to Ogygiinae'
- 'Asaphellus catamarcensis belongs to Asaphellus' according to Kobayashi 1935
- 'Asaphellus catamarcensis belongs to Asaphellus'
- 'Asaphellus jujuanus belongs to Asaphellus'
- 'Asaphellus riojanus belongs to Asaphellus'
- 'Asaphidae belongs to Asaphacea'
- 'Asaphina belongs to Ptychopariida'
- 'Asaphinae belongs to Asaphidae'
- 'Asaphopsis belongs to Dikelocephalinidae'
- 'Asaphopsis intermedia belongs to Asaphopsis'
- 'Asaphus (Ampyx) was reranked as Ampyx and belongs to Raphiophoridae'
- 'Australoharpes belongs to Harpidae'
- 'Australoharpes depressus belongs to Australoharpes'
- 'Australopyge belongs to Ogygiinae'
- 'Australopyge acanthura belongs to Australopyge'
- 'Australopyge russoi belongs to Australopyge'
- 'Basiliella belongs to Asaphinae'
- 'Basiliella carinata belongs to Basiliella' according to Harrington 1938
- 'Basiliella carinata belongs to Basiliella'
- 'Beltella belongs to Pelturinae'
- 'Beltella ulrichi belongs to Beltella' according to Harrington 1938
- 'Beltella ulrichi belongs to Beltella'
- 'Bodenbenderia belongs to Trilobita'
- 'Bodenbenderia longifrons belongs to Bodenbenderia'
- 'Brackebuschia belongs to Trilobita'
- 'Brackebuschia acheila belongs to Brackebuschia'
- 'Synhomalonotus pompeckji is replaced by Synhomalonotus kobayashii'
- 'Calymenella belongs to Homalonotidae'
- 'Calymenella zaplensis belongs to Calymenella'
- 'Calymenidae belongs to Calymenina'
- 'Calymenina belongs to Phacopida'
- 'Ceratopyge belongs to Ceratopygidae'
- 'Ceratopyge forficuloides belongs to Ceratopyge'
- 'Ceratopygidae belongs to Asaphacea'
- 'Cheiruridae belongs to Cheirurina'
- 'Cheirurina belongs to Phacopida'
- 'Ciceragnostus belongs to Phalacrominae'
- 'Ciceragnostus iruyensis belongs to Ciceragnostus' according to Kayser 1897
- 'Ciceragnostus iruyensis belongs to Ciceragnostus'
- 'Colpocoryphoides belongs to Calymenidae'
- 'Colpocoryphoides trapezoidalis belongs to Colpocoryphoides'
- 'Conocoryphacea belongs to Ptychopariina'
- 'Cryptolithinae belongs to Trinucleidae'
- 'Cyclognathus glaber is recombined as Acerocarina glaber'
- 'Cyrtometopus belongs to Cheiruridae'
- 'Dalmanitina tellecheai is recombined as Proetiella tellecheai'
- 'Deltacare belongs to Trilobita'
- 'Deltacare prosops belongs to Deltacare'
- 'Dichelepyge belongs to Ceratopygidae'
- 'Dichelepyge pascuali belongs to Dichelepyge' according to Harrington and Leanza 1952
- 'Dichelepyge pascuali belongs to Dichelepyge'
- 'Dikelokephalinidae is corrected as Dikelocephalinidae and belongs to Asaphacea'
- 'Dolerasaphus belongs to Ogygiinae'
- 'Dolerasaphus laevis belongs to Dolerasaphus'
- 'Dolerobasilicus belongs to Asaphinae'
- 'Encrinuridae belongs to Cheirurina'
- 'Encrinurus belongs to Encrinuridae'
- 'Encrinurus niquivilensis belongs to Encrinurus'
- 'Famatinolithus belongs to Cryptolithinae'
- 'Famatinolithus noticus belongs to Famatinolithus'
- 'Gallagnostus belongs to Phalacrominae'
- 'Gallagnostus bolivianus belongs to Gallagnostus' according to Hoek 1912
- 'Gallagnostus bolivianus belongs to Gallagnostus'
- 'Geragnostidae was reranked as the subfamily Geragnostinae and belongs to Agnostidae'
- 'Geragnostus belongs to Geragnostinae'
- 'Geragnostus (Geragnostus) belongs to Geragnostus'
- 'Geragnostus (Geragnostus) belongs to Geragnostus' according to Howell 1935
- 'Geragnostus (Geragnostus) maurii belongs to Geragnostus (Geragnostus)'
- 'Geragnostus (Geragnostus) nesossii belongs to Geragnostus (Geragnostus)'
- 'Geragnostus (Microagnostus) belongs to Geragnostus' according to Howell 1935
- 'Geragnostus (Microagnostus) belongs to Geragnostus'
- 'Geragnostus (Microagnostus) calviformis is recombined as Geragnostus (Micragnostus) calviformis'
- 'Geragnostus (Microagnostus) calviformis belongs to Geragnostus (Microagnostus)'
- 'Geragnostus (Microagnostus) hoeki belongs to Geragnostus (Microagnostus)' according to Kobayashi 1939
- 'Geragnostus (Microagnostus) hoeki belongs to Geragnostus (Microagnostus)'
- 'Geragnostus (Microagnostus) micropeltis belongs to Geragnostus (Microagnostus)'
- 'Geragnostus (Microagnostus) neumanni belongs to Geragnostus (Microagnostus)'
- 'Geragnostus (Microagnostus) tilcuyensis belongs to Geragnostus (Microagnostus)' according to Kobayashi 1937
- 'Geragnostus (Microagnostus) tilcuyensis belongs to Geragnostus (Microagnostus)'
- 'Geragnostus (Microagnostus) vilonii belongs to Geragnostus (Microagnostus)'
- 'Guandacolithus belongs to Tretaspidinae'
- 'Guandacolithus furquei belongs to Guandacolithus'
- 'Hapalopleura belongs to Hapalopleuridae'
- 'Hapalopleura clavata belongs to Hapalopleura'
- 'Hapalopleura longicornis belongs to Hapalopleura'
- 'Hapalopleuridae belongs to Trinucleina'
- 'Harpidae belongs to Harpina'
- 'Harpides belongs to Harpididae'
- 'Harpides neogaeus belongs to Harpides'
- 'Harpididae belongs to Harpina'
- 'Hoekaspis belongs to Ogygiinae'
- 'Hoekaspis megacantha belongs to Hoekaspis' according to Leanza 1941
- 'Hoekaspis schlagintweiti belongs to Hoekaspis' according to Harrington and Leanza 1942
- 'Hoekaspis schlagintweiti belongs to Hoekaspis'
- 'Homalonotidae belongs to Calymenina'
- 'Hypermecaspididae belongs to Olenina'
- 'Hypermecaspis belongs to Hypermecaspididae'
- 'Hypermecaspis armata belongs to Hypermecaspis'
- 'Hypermecaspis bulmani belongs to Hypermecaspis'
- 'Hypermecaspis inermis belongs to Hypermecaspis'
- 'Hypermecaspis inflecta belongs to Hypermecaspis'
- 'Illaenacea belongs to Asaphina'
- 'Illaenidae belongs to Illaenacea'
- 'Illaenopsis belongs to Nileidae'
- 'Illaenus stenorhachis is recombined as Illaenopsis stenorhachis'
- 'Jujuyaspis belongs to Pelturinae'
- 'Jujuyaspis keideli belongs to Jujuyaspis' according to Kobayashi 1936
- 'Jujuyaspis keideli belongs to Jujuyaspis'
- 'Kainella belongs to Richardsonellinae'
- 'Kainella conica belongs to Kainella' according to Kobayashi 1935
- 'Kainella conica belongs to Kainella'
- 'Kainella meridionalis belongs to Kainella' according to Kobayashi 1935
- 'Kainella meridionalis belongs to Kainella'
- 'Kayseraspis belongs to Ogygiinae'
- 'Kayseraspis asaphelloides belongs to Kayseraspis'
- 'Kayseraspis asaphelloides belongs to Kayseraspis' according to Harrington 1938
- 'Kayseraspis brackebuschi belongs to Kayseraspis' according to Harrington 1938
- 'Kayseraspis brackebuschi belongs to Kayseraspis'
- 'Keidelia belongs to Proetidae'
- 'Keidelia macrophthalma belongs to Keidelia'
- 'Leiagnostus belongs to Phalacrominae'
- 'Leiagnostus perinflatus belongs to Leiagnostus'
- 'Leiagnostus turgidulus belongs to Leiagnostus'
- 'Leiostegiacea belongs to Ptychopariina'
- 'Leiostegiidae belongs to Leiostegiacea'
- 'Leptoplastinae belongs to Olenidae'
- 'Lloydia belongs to Leiostegiidae'
- 'Lloydia (Leiostegium) belongs to Lloydia' according to Raymond 1913
- 'Lloydia (Leiostegium) belongs to Lloydia'
- 'Lloydia (Leiostegium) douglasi belongs to Lloydia (Leiostegium)' according to Harrington 1937
- 'Lloydia (Leiostegium) douglasi belongs to Lloydia (Leiostegium)'
- 'Lonchodomas belongs to Raphiophoridae'
- 'Lonchodomas suriensis belongs to Lonchodomas'
- 'Machairagnostus belongs to Pseudagnostinae'
- 'Machairagnostus tmetus belongs to Machairagnostus'
- 'Megalaspidella belongs to Ogygiinae'
- 'Megalaspidella kayseri belongs to Megalaspidella' according to Kobayashi 1937
- 'Megalaspidella orthometopa is recombined as Notopeltis orthometopa'
- 'Megalaspidella pumila is a subjective synonym of Notopeltis orthometopa'
- 'Megalaspis belongs to Ogygiinae'
- 'Megalaspis pugiocauda belongs to Megalaspis'
- 'Megalaspis saltaensis belongs to Megalaspis' according to Kayser 1898
- 'Megalaspis saltaensis belongs to Megalaspis'
- 'Mekynophrys belongs to Leptoplastinae'
- 'Mekynophrys nanna belongs to Mekynophrys' according to Harrington 1938
- 'Mekynophrys nanna belongs to Mekynophrys'
- 'Mendolaspis belongs to Raphiophoridae'
- 'Mendolaspis salagastensis belongs to Mendolaspis' according to Rusconi 1951
- 'Mendolaspis salagastensis belongs to Mendolaspis'
- 'Metapilekia belongs to Pliomeridae'
- 'Metapilekia bilirata belongs to Metapilekia' according to Harrington 1938
- 'Nanillaenus belongs to Illaenidae'
- 'Nanillaenus gualcamayensis belongs to Nanillaenus'
- 'Nannopeltis belongs to Trilobita'
- 'Nannopeltis modesta belongs to Nannopeltis' according to Harrington 1938
- 'Nileidae belongs to Asaphacea'
- 'Nileidae stenorhachis belongs to Nileidae' according to Harrington 1938
- 'Niobides belongs to Ogygiinae'
- 'Niobides armatus belongs to Niobides'
- 'Niobina belongs to Ogygiinae'
- 'Niobina taurina belongs to Niobina'
- 'Notopeltis belongs to Ogygiinae'
- 'Ogygiinae belongs to Asaphidae'
- 'Ogygiocarella belongs to Ogygiinae'
- 'Ogygiocarella debuchana belongs to Ogygiocarella'
- 'Ogygiocaris belongs to Ogygiinae'
- 'Ogygiocaris araiorhachis belongs to Ogygiocaris'
- 'Ogygitella belongs to Asaphinae'
- 'Ogygitella australis belongs to Ogygitella'
- 'Olenidae belongs to Olenina'
- 'Olenina belongs to Ptychopariida'
- 'Oleninae belongs to Olenidae'
- 'Olenus argentinus is recombined as Parabolina argentina'
- 'Olenus frequens is recombined as Parabolina frequens'
- 'Onychopyge belongs to Ceratopygidae'
- 'Onychopyge argentina belongs to Onychopyge'
- 'Onychopyge longispina belongs to Onychopyge'
- 'Onychopyge plagiacantha belongs to Onychopyge'
- 'Onychopyge riojana belongs to Onychopyge'
- 'Orometopidae belongs to Trinucleina'
- 'Orometopus belongs to Orometopidae'
- 'Orometopus notatifrons belongs to Orometopus'
- 'Orometopus pyrifrons belongs to Orometopus' according to Harrington 1938
- 'Orometopus pyrifrons belongs to Orometopus'
- 'Parabasilicus belongs to Asaphinae'
- 'Parabasilicus typicalis belongs to Parabasilicus' according to Kobayashi 1937
- 'Parabasilicus typicalis belongs to Parabasilicus'
- 'Parabolina belongs to Oleninae'
- 'Parabolina kobayashii belongs to Parabolina'
- 'Parabolina pheidolopyge belongs to Parabolina' according to Harrington 1938
- 'Parabolina pheidolopyge belongs to Parabolina'
- 'Parabolinella belongs to Triarthrinae'
- 'Parabolinella argentinensis belongs to Parabolinella'
- 'Parabolinella coelatifrons belongs to Parabolinella'
- 'Parabolinella tetragonalis is recombined as Triarthrus tetragonalis'
- 'Parabolinella triarthroides belongs to Parabolinella' according to Harrington 1938
- 'Parabolinella triarthroides belongs to Parabolinella'
- 'Parabolinopsis belongs to Pelturinae'
- 'Parabolinopsis mariana belongs to Parabolinopsis'
- 'Pelturinae belongs to Olenidae'
- 'Peronopseinae belongs to Peronopsidae'
- 'Peronopsidae belongs to Agnostina'
- 'Phacopida belongs to Trilobita'
- 'Phalacrominae belongs to Peronopsidae'
- 'Plesioparabolina belongs to Oleninae'
- 'Plesioparabolina proparia belongs to Plesioparabolina' according to Harrington and Leanza 1942
- 'Plesioparabolina proparia belongs to Plesioparabolina'
- 'Plicatolina belongs to Triarthrinae'
- 'Plicatolina scalpta belongs to Plicatolina'
- 'Pliomera belongs to Pliomeridae'
- 'Pliomera tmetophrys belongs to Pliomera'
- 'Pliomeridae belongs to Cheirurina'
- 'Pliomeroides belongs to Pliomeridae'
- 'Pliomeroides deferrariisi belongs to Pliomeroides' according to Harrington 1938
- 'Porterfieldia belongs to Triarthrinae'
- 'Porterfieldia jachalensis belongs to Porterfieldia'
- 'Proceratopyge belongs to Ceratopygidae'
- 'Proceratopyge incondita belongs to Proceratopyge'
- 'Proetacea belongs to Olenina'
- 'Proetidae belongs to Proetacea'
- 'Proetiella belongs to Proetidae'
- 'Protopeltura belongs to Pelturinae'
- 'Protopeltura mesembria belongs to Protopeltura'
- 'Protopliomerops belongs to Pliomeridae'
- 'Protopliomerops rossi belongs to Protopliomerops'
- 'Pseudagnostidae was reranked as the subfamily Pseudagnostinae and belongs to Agnostidae'
- 'Pseudohysterolenus belongs to Ceratopygidae'
- 'Pseudohysterolenus infidus belongs to Pseudohysterolenus'
- 'Pseudokainella belongs to Richardsonellinae'
- 'Pseudokainella keideli belongs to Pseudokainella' according to Harrington 1938
- 'Pseudokainella lata belongs to Pseudokainella' according to Kobayashi 1935
- 'Pseudokainella lata belongs to Pseudokainella'
- 'Pseudokainella pustulosa belongs to Pseudokainella'
- 'Pseudoperonopsis belongs to Peronopseinae'
- 'Pseudoperonopsis zuninoi belongs to Pseudoperonopsis'
- 'Ptychopariida belongs to Trilobita'
- 'Ptychopariina belongs to Ptychopariida'
- 'Raphiophoridae belongs to Trinucleina'
- 'Raphiophorus belongs to Raphiophoridae'
- 'Raphiophorus lamasi belongs to Raphiophorus'
- 'Remopleuridacea belongs to Olenina'
- 'Remopleurididae belongs to Remopleuridacea'
- 'Remopleuridinae belongs to Remopleurididae'
- 'Remopleuridioides belongs to Remopleuridinae'
- 'Remopleuridioides preandinus belongs to Remopleuridioides'
- 'Rhadinopleura belongs to Hapalopleuridae'
- 'Rhadinopleura eurycephala belongs to Rhadinopleura'
- 'Richardsonellidae was reranked as the subfamily Richardsonellinae and belongs to Remopleurididae'
- 'Saltaspis belongs to Pelturinae'
- 'Saltaspis steinmanni belongs to Saltaspis' according to Harrington and Leanza 1952
- 'Saltaspis steinmanni belongs to Saltaspis'
- 'Shumardia belongs to Shumardiidae'
- 'Shumardia erquensis belongs to Shumardia' according to Kobayashi 1937
- 'Shumardia erquensis belongs to Shumardia'
- 'Shumardia minutula belongs to Shumardia'
- 'Shumardiidae belongs to Conocoryphacea'
- 'Sphaerocare belongs to Trilobita'
- 'Sphaerocare globifrons belongs to Sphaerocare'
- 'Synhomalonotus belongs to Calymenidae'
- 'Synhomalonotus kobayashii belongs to Synhomalonotus'
- 'Thysanopyge belongs to Ogygiinae'
- 'Thysanopyge argentina belongs to Thysanopyge' according to Kayser 1898
- 'Thysanopyge argentina belongs to Thysanopyge'
- 'Thysanopyge clavijoi belongs to Thysanopyge'
- 'Thysanopyge latelimbata belongs to Thysanopyge'
- 'Tretaspidinae belongs to Trinucleidae'
- 'Triarthrinae belongs to Olenidae'
- 'Triarthrus belongs to Triarthrinae'
- 'Triarthrus parchaensis belongs to Triarthrus'
- 'Triarthrus rectifrons belongs to Triarthrus'
- 'Triarthrus shinetonensis belongs to Triarthrus' according to Raw 1908
- 'Triarthrus shinetonensis belongs to Triarthrus'
- 'Trinodus belongs to Geragnostinae'
- 'Trinodus jujuyensis belongs to Trinodus' according to Harrington 1938
- 'Trinodus jujuyensis belongs to Trinodus'
- 'Trinodus saltaensis belongs to Trinodus'
- 'Trinucleidae belongs to Trinucleina'
- 'Trinucleina belongs to Ptychopariida'
- 'Zuninaspis belongs to Ogygiinae'
- 'Zuninaspis acuminata belongs to Zuninaspis'