Opinions from U. S. Grant and L. G. Hertlein 1938
- 'Agarites was reranked as Echinus (Agarites) and belongs to Echinus' according to Valenciennes 1846
- 'Agassizia belongs to Hemiasteridae'
- 'Agassizia scrobiculata belongs to Agassizia' according to Valenciennes 1846
- 'Agassizia scrobiculata belongs to Agassizia'
- 'Amblypygus belongs to Conulidae'
- 'Amblypygus subhemisphericus belongs to Amblypygus' according to Israelsky 1923
- 'Amblypygus subhemisphericus belongs to Amblypygus'
- 'Anorthoscutum belongs to Scutellidae'
- 'Anorthoscutum oregonense quaylet belongs to Anorthoscutum oregonense'
- 'Arbacia belongs to Arbaciidae'
- 'Arbaciadae is corrected as Arbaciidae and belongs to Stirodonta'
- 'Astrodapsis belongs to Scutellidae'
- 'Astrodapsis altus belongs to Astrodapsis'
- 'Astrodapsis antiselli belongs to Astrodapsis'
- 'Astrodapsis arnoldi crassus is recombined as Astrodapsis crassus'
- 'Astrodapsis arnoldi depressus is recombined as Astrodapsis depressus'
- 'Astrodapsis arnoldi fresnoensis is recombined as Astrodapsis fresnoensis'
- 'Astrodapsis arnoldi spatiosus belongs to Astrodapsis arnoldi' according to Kew 1920
- 'Astrodapsis arnoldi spatiosus is recombined as Astrodapsis spatiosus'
- 'Astrodapsis brewerianus diabloensis belongs to Astrodapsis brewerianus' according to Kew 1920
- 'Astrodapsis brewerianus diabloensis belongs to Astrodapsis brewerianus'
- 'Astrodapsis californicus belongs to Astrodapsis'
- 'Astrodapsis coalingaensis belongs to Astrodapsis'
- 'Astrodapsis cuyamanus belongs to Astrodapsis'
- 'Astrodapsis fernandoensis belongs to Astrodapsis'
- 'Astrodapsis grandis belongs to Astrodapsis'
- 'Astrodapsis israelskyi belongs to Astrodapsis'
- 'Astrodapsis jacalitosensis belongs to Astrodapsis'
- 'Astrodapsis kewi belongs to Astrodapsis'
- 'Astrodapsis major belongs to Astrodapsis'
- 'Astrodapsis margaritanus belongs to Astrodapsis'
- 'Astrodapsis merriami is recombined as Echinarachnius merriami'
- 'Astrodapsis ornatus belongs to Astrodapsis'
- 'Astrodapsis peltoides belongs to Astrodapsis'
- 'Astrodapsis salinasensis belongs to Astrodapsis' according to Richards 1935
- 'Astrodapsis salinasensis belongs to Astrodapsis'
- 'Astrodapsis schencki belongs to Astrodapsis'
- 'Astrodapsis scutelliformis belongs to Astrodapsis'
- 'Astrodapsis tumidus belongs to Astrodapsis'
- 'Astrodapsis tumidus cierboensis is recombined as Astrodapsis cierboensis'
- 'Astrodapsis whitneyi belongs to Astrodapsis'
- 'Astropyga belongs to Centrechinidae'
- 'Aulodonta was reranked as a suborder and belongs to Centrechinoida'
- 'Boletia rosea is recombined as Toxopneustes rosea'
- 'Brisaster belongs to Hemiasteridae'
- 'Brisaster maximus belongs to Brisaster'
- 'Brissopsis belongs to Spatangidae'
- 'Brissopsis columbaris belongs to Brissopsis' according to Agassiz 1840
- 'Brissopsis columbaris belongs to Brissopsis'
- 'Brissus belongs to Spatangidae'
- 'Brissus kewi belongs to Brissus'
- 'Caenocentrotus belongs to Strongylocentrotidae'
- 'Calocidaris is a subjective synonym of Cidaris'
- 'Camarodonta was reranked as a suborder and belongs to Cidaroidea'
- 'Cassidulidae belongs to Cassidulina'
- 'Cassidulina belongs to Exocycloida'
- 'Cassidulus belongs to Cassidulidae'
- 'Cassidulus (Rhynchopygus) ellipticus is recombined as Cassidulus ellipticus'
- 'Cassidulus (Rhynchopygus) mexicanus is recombined as Cassidulus mexicanus'
- 'Cassidulus californicus is recombined as Rhynchopygus californicus'
- 'Catopygus belongs to Cassidulidae'
- 'Catopygus cajonensis belongs to Catopygus' according to Kew 1920
- 'Catopygus cajonensis belongs to Catopygus'
- 'Catopygus californicus belongs to Catopygus'
- 'Centrechinidae belongs to Aulodonta'
- 'Centrechinoida belongs to Echinoidea'
- 'Centrechinus belongs to Centrechinidae'
- 'Centrocidaris belongs to Cidaridae'
- 'Centrostephanus belongs to Centrechinidae'
- 'Cidaridae belongs to Cidaroidea'
- 'Cidaris belongs to Cidaridae'
- 'Cidaris (Eucidaris) thouarsii galapagensis belongs to Cidaris (Eucidaris) thouarsii' according to Döderlein 1887
- 'Cidaris (Eucidaris) thouarsii galapagensis is recombined as Eucidaris thouarsii galapagensis' according to Döderlein 1928
- 'Cidaris (Eucidaris) thouarsii galapagensis is recombined as Eucidaris thouarsii galapagensis'
- 'Cidaris californicus belongs to Cidaris' according to W. B. Clark 1893
- 'Cidaris californicus belongs to Cidaris'
- 'Cidaris dilleri belongs to Cidaris'
- 'Cidaris lorenzanus belongs to Cidaris'
- 'Cidaris martinezensis belongs to Cidaris'
- 'Cidaris merriami is recombined as Hesperocidaris merriami'
- 'Cidaris plumasensis belongs to Cidaris'
- 'Cidaris shastensis belongs to Cidaris'
- 'Cidaris taylorensis belongs to Cidaris' according to W. B. Clark 1893
- 'Cidaris taylorensis belongs to Cidaris'
- 'Cidaris tehamaensis belongs to Cidaris'
- 'Cidaris thouarsii is recombined as Eucidaris thouarsii'
- 'Cidaris thouarsii is recombined as Cidaris (Eucidaris) thouarsii' according to Döderlein 1887
- 'Cidarites pulvinata belongs to Cidarites' according to Lamarck 1816
- 'Cidarites pulvinata is recombined as Astropyga pulvinata'
- 'Cidaroidea belongs to Echinoidea'
- 'Clypeaster belongs to Clypeastridae'
- 'Clypeaster bowersi belongs to Clypeaster'
- 'Clypeaster carrizoensis belongs to Clypeaster'
- 'Clypeaster deserti belongs to Clypeaster'
- 'Clypeaster europacificus belongs to Clypeaster' according to Clark 1914
- 'Clypeaster europacificus belongs to Clypeaster'
- 'Clypeaster gabbii is recombined as Echinarachnius gabbii'
- 'Clypeaster gatuni belongs to Clypeaster'
- 'Clypeaster ochrus belongs to Clypeaster' according to Clark 1914
- 'Clypeaster ochrus belongs to Clypeaster'
- 'Clypeaster speciosus belongs to Clypeaster' according to Verrill 1870
- 'Clypeaster speciosus belongs to Clypeaster'
- 'Clypeastres [misspelled as Clypeastridae] belongs to Clypeastrina'
- 'Clypeastrina belongs to Exocycloida'
- 'Coelopleurus belongs to Arbaciidae'
- 'Coelopleurus coronaformis belongs to Coelopleurus' according to Israelsky 1923
- 'Coelopleurus coronaformis belongs to Coelopleurus'
- 'Conulusidae is corrected as Conulidae and belongs to Echinoneina'
- 'Dendraster belongs to Scutellidae'
- 'Dendraster (Calaster) oregonensis major belongs to Dendraster (Calaster) oregonensis' according to Kew 1920
- 'Dendraster (Calaster) oregonensis major is recombined as Anorthoscutum oregonensis major'
- 'Dendraster arnoldi is recombined as Merriamaster arnoldi'
- 'Dendraster ashleyi ynezensis belongs to Dendraster ashleyi' according to Kew 1919
- 'Dendraster ashleyi ynezensis belongs to Dendraster ashleyi'
- 'Dendraster casseli belongs to Dendraster'
- 'Dendraster cedrosensis belongs to Dendraster' according to Israelsky 1923
- 'Dendraster cedrosensis belongs to Dendraster'
- 'Dendraster coalingaensis belongs to Dendraster'
- 'Dendraster diegoensis belongs to Dendraster'
- 'Dendraster diegoensis venturaensis is recombined as Dendraster venturaensis'
- 'Dendraster excentrius elongatus belongs to Dendraster excentrius' according to Clark 1935
- 'Dendraster excentrius elongatus belongs to Dendraster excentrius'
- 'Dendraster gibbsii humilis belongs to Dendraster gibbsii' according to Kew 1920
- 'Dendraster gibbsii humilis belongs to Dendraster gibbsii'
- 'Dendraster hesperis belongs to Dendraster'
- 'Dendraster hesperis gibbosus belongs to Dendraster hesperis'
- 'Dendraster pacificus is recombined as Merriamaster pacificus'
- 'Dendraster pentagonalis belongs to Dendraster' according to Israelsky 1923
- 'Dendraster pentagonalis belongs to Dendraster'
- 'Dendraster vizcainoensis belongs to Dendraster'
- 'Dendraster vizcainoensis similaris belongs to Dendraster vizcainoensis'
- 'Diadema mexicanum belongs to Diadema' according to Agassiz 1863
- 'Diadema mexicanum is recombined as Centrechinus mexicanum'
- 'Dorocidaris is a subjective synonym of Cidaris'
- 'Dorocidaris panamensis belongs to Dorocidaris' according to Agassiz 1898
- 'Dorocidaris panamensis is recombined as Hesperocidaris panamensis'
- 'Echinarachinus brewerianus is recombined as Astrodapsis brewerianus'
- 'Echinarachnius belongs to Scutellidae'
- 'Echinarachnius andersoni belongs to Echinarachnius' according to Twitchell 1905
- 'Echinarachnius andersoni belongs to Echinarachnius'
- 'Echinarachnius ashleyi belongs to Echinarachnius' according to Arnold 1907
- 'Echinarachnius ashleyi is recombined as Dendraster ashleyi'
- 'Echinarachnius gabbi kleinpelli belongs to Echinarachnius gabbi'
- 'Echinarachnius parma obesa belongs to Echinarachnius parma' according to Clark 1914
- 'Echinarachnius parma obesa belongs to Echinarachnius parma'
- 'Echinidae belongs to Camarodonta'
- 'Echinocidaris incisa belongs to Echinocidaris' according to Agassiz 1863
- 'Echinocidaris incisa is recombined as Arbacia incisa'
- 'Echinocyamus belongs to Fibulariidae'
- 'Echinocyamus terminalis belongs to Echinocyamus'
- 'Echinodiadema coronata belongs to Echinodiadema' according to Verill 1867
- 'Echinodiadema coronata is recombined as Centrostephanus coronata'
- 'Echinometra belongs to Echinometridae'
- 'Echinometra insularis belongs to Echinometra' according to Clark 1912
- 'Echinometra insularis belongs to Echinometra'
- 'Echinometra vanbrunti belongs to Echinometra' according to Agassiz 1863
- 'Echinometra vanbrunti belongs to Echinometra'
- 'Echinometradae is corrected as Echinometridae and belongs to Camarodonta'
- 'Echinoneides is corrected as Echinoneidae and belongs to Echinoneina'
- 'Echinoneina belongs to Exocycloida'
- 'Echinoneus belongs to Echinoneidae'
- 'Echinoneus burgeri belongs to Echinoneus'
- 'Echinus belongs to Echinidae'
- 'Echinus was reranked as the class Echinoidea and belongs to Echinodermata'
- 'Echinus (Agarites) spatuliger belongs to Echinus (Agarites)' according to Valenciennes 1846
- 'Echinus (Agarites) spatuliger is recombined as Arbacia spatuligera'
- 'Echinus (Psammechinus) semituberculatus belongs to Echinus (Psammechinus)' according to Agassiz and Desor 1867
- 'Echinus (Psammechinus) semituberculatus is recombined as Lytechinus semituberculatus'
- 'Echinus (Toxopneustes) gibbosus belongs to Echinus (Toxopneustes)' according to Agassiz and Desor 1846
- 'Echinus (Toxopneustes) gibbosus is recombined as Caenocentrotus gibbosus'
- 'Echinus albus belongs to Echinus' according to Molina 1782
- 'Echinus albus is recombined as Loxechinus albus'
- 'Echinus anchistus belongs to Echinus' according to Clark 1912
- 'Echinus anchistus belongs to Echinus'
- 'Echinus droebachiensis is recombined as Strongylocentrotus droebachiensis'
- 'Echinus dufresnii belongs to Echinus' according to Blainville 1825
- 'Echinus dufresnii is recombined as Arbacia dufresnii'
- 'Echinus euryporus belongs to Echinus' according to Clark 1909
- 'Echinus euryporus belongs to Echinus'
- 'Echinus gratilla is recombined as Tripneustes gratilla'
- 'Echinus gratilla belongs to Echinus' according to Linnaeus 1758
- 'Echinus horridus belongs to Echinus' according to Agassiz 1879
- 'Echinus horridus belongs to Echinus'
- 'Echinus magellanicus belongs to Echinus' according to Phillippi 1857
- 'Echinus magellanicus is recombined as Pseudechinus magellanicus'
- 'Echinus niger is recombined as Tetrapygus niger'
- 'Echinus niger belongs to Echinus' according to Molina 1782
- 'Echinus oblonga belongs to Echinus' according to Blainville 1825
- 'Echinus oblonga is recombined as Echinometra oblonga'
- 'Echinus purpuratus is recombined as Strongylocentrotus purpuratus'
- 'Echinus spatagus belongs to Echinus' according to Linnaeus 1758
- 'Echinus spatagus is recombined as Metalia spatagus'
- 'Encope belongs to Scutellidae'
- 'Encope californica belongs to Encope' according to Verrill 1870
- 'Encope californica belongs to Encope'
- 'Encope chilensis belongs to Encope'
- 'Encope chilensis belongs to Encope' according to Philippi 1887
- 'Encope grandis belongs to Encope' according to Agassize 1841
- 'Encope grandis belongs to Encope'
- 'Encope micropora belongs to Encope' according to Agassiz 1841
- 'Encope micropora belongs to Encope'
- 'Encope occidentalis belongs to Encope' according to Verrill 1867
- 'Encope occidentalis belongs to Encope'
- 'Encope perspectiva belongs to Encope' according to Agassiz 1841
- 'Encope perspectiva belongs to Encope'
- 'Encope peruviana belongs to Encope' according to Brighton 1926
- 'Encope peruviana belongs to Encope'
- 'Encope tenuis belongs to Encope'
- 'Eoagassizia belongs to Hemiasteridae'
- 'Eoagassizia alta belongs to Eoagassizia'
- 'Eoscutella belongs to Scutellidae'
- 'Epiaster belongs to Paleopneustidae'
- 'Epiaster depressus belongs to Epiaster'
- 'Eucidaris belongs to Cidaridae'
- 'Eucidaris was reranked as Cidaris (Eucidaris) and belongs to Cidaris' according to Döderlein 1887
- 'Eupatagus belongs to Spatangidae'
- 'Eupatagus stevensi belongs to Eupatagus'
- 'Exocycloida belongs to Echinoidea'
- 'Fibularina was reranked as the family Fibulariidae and belongs to Clypeastrina'
- 'Gonimaretia belongs to Spatangidae'
- 'Gonimaretia laevis belongs to Gonimaretia' according to Clark 1917
- 'Gonimaretia laevis belongs to Gonimaretia'
- 'Goniocidaris doderleini belongs to Goniocidaris' according to Agassiz 1898
- 'Goniocidaris doderleini is recombined as Centrocidaris doderleini'
- 'Heliocidaris belongs to Strongylocentrotidae'
- 'Heliocidaris stenopora belongs to Heliocidaris' according to Clark 1912
- 'Heliocidaris stenopora belongs to Heliocidaris'
- 'Hemiaster belongs to Hemiasteridae'
- 'Hemiaster (Integraster) was reranked as Integraster and belongs to Hemiasteridae'
- 'Hemiaster alamedensis is recombined as Integraster alamedensis'
- 'Hemiaster californicus belongs to Hemiaster'
- 'Hemiaster cholamensis is recombined as Integraster cholamensis'
- 'Hemiaster oregonensis belongs to Hemiaster'
- 'Hemiasteridae belongs to Spatangina'
- 'Hesperocidaris belongs to Cidaridae'
- 'Hipponoe californica is recombined as Tripneustes californicus'
- 'Histocidaris belongs to Cidaridae'
- 'Lenita belongs to Fibulariidae'
- 'Lenita israelskyi belongs to Lenita'
- 'Linthia belongs to Hemiasteridae'
- 'Linthia californica is recombined as Periaster californicus'
- 'Linthia sanrafaelensis belongs to Linthia' according to Israelsky 1923
- 'Linthia sanrafaelensis belongs to Linthia'
- 'Loveina hemphilli belongs to Loveina' according to Israelsky 1923
- 'Loveina hemphilli belongs to Loveina'
- 'Lovenia belongs to Spatangidae'
- 'Lovenia cordiformis belongs to Lovenia' according to Agassiz 1872
- 'Lovenia cordiformis belongs to Lovenia'
- 'Loxechinus belongs to Strongylocentrotidae'
- 'Lytechinus belongs to Echinidae'
- 'Lytechinus anamesus belongs to Lytechinus' according to Clark 1912
- 'Lytechinus anamesus belongs to Lytechinus'
- 'Lytechinus coreyi belongs to Lytechinus'
- 'Lytechinus milleri belongs to Lytechinus'
- 'Macropneustes belongs to Spatangidae'
- 'Maretia belongs to Spatangidae'
- 'Megapetalus belongs to Spatangidae'
- 'Megapetalus lovenioides belongs to Megapetalus'
- 'Mellita belongs to Scutellidae'
- 'Mellita longifissa belongs to Mellita' according to Michelin 1858
- 'Mellita longifissa belongs to Mellita'
- 'Mellita pacifica belongs to Mellita'
- 'Mellita pacifica belongs to Mellita' according to Verrill 1867
- 'Meoma belongs to Spatangidae'
- 'Meoma grandis belongs to Meoma' according to Gray 1852
- 'Meoma grandis belongs to Meoma'
- 'Merriamaster belongs to Scutellidae'
- 'Metalia belongs to Spatangidae'
- 'Moera is replaced by Moira'
- 'Moera clothro belongs to Moera' according to Michelin 1855
- 'Moera clothro is recombined as Moira clothro'
- 'Moira belongs to Hemiasteridae'
- 'Nacospatangus belongs to Paleopneustidae'
- 'Nacospatangus depressus belongs to Nacospatangus'
- 'Nacospatangus depressus belongs to Nacospatangus' according to Clark 1917
- 'Nacospatangus gracilis belongs to Nacospatangus' according to Agassiz 1873
- 'Nacospatangus gracilis belongs to Nacospatangus'
- 'Orchoporus belongs to Fibulariidae'
- 'Orchoporus koehleri belongs to Orchoporus'
- 'Orchoporus koehleri belongs to Orchoporus' according to Lambert and Thier 1914
- 'Orchoporus lamberti belongs to Orchoporus'
- 'Paleoechinoneus belongs to Echinoneidae'
- 'Paleoechinoneus hannai belongs to Paleoechinoneus'
- 'Paleopneustes belongs to Paleopneustidae'
- 'Paleopneustes holmani belongs to Paleopneustes'
- 'Paleopneustidae belongs to Spatangina'
- 'Periaster belongs to Hemiasteridae'
- 'Polydiadema belongs to Centrechinidae'
- 'Polydiadema joaquinensis belongs to Polydiadema'
- 'Porocidaris cobosi belongs to Porocidaris' according to Agassiz 1898
- 'Porocidaris cobosi is recombined as Histocidaris cobosi'
- 'Psammechinus was reranked as Echinus (Psammechinus) and belongs to Echinus' according to Agassiz and Desor 1867
- 'Psammechinus intermedius belongs to Psammechinus' according to Barn 1863
- 'Psammechinus intermedius is recombined as Strongylocentrotus intermedius'
- 'Psammechinus pictus belongs to Psammechinus' according to Verrill 1867
- 'Psammechinus pictus is recombined as Lytechinus pictus'
- 'Psammechinus pulcherriumus belongs to Psammechinus' according to Agassiz 1863
- 'Psammechinus pulcherriumus is recombined as Strongylocentrotus pulcherriumus'
- 'Pseudechinus belongs to Echinidae'
- 'Pygorhynchus pacificus belongs to Pygorhynchus' according to Agassiz 1869
- 'Pygorhynchus pacificus is recombined as Cassidulus pacificus'
- 'Rhynchopygus belongs to Cassidulidae'
- 'Schizaster belongs to Hemiasteridae'
- 'Schizaster cordiformis belongs to Schizaster'
- 'Schizaster diabloensis belongs to Schizaster'
- 'Schizaster latifrons belongs to Schizaster' according to Agassiz 1898
- 'Schizaster latifrons is recombined as Brisaster latifrons'
- 'Schizaster lecontei belongs to Schizaster'
- 'Schizaster martinezensis belongs to Schizaster'
- 'Schizaster moseleyi belongs to Schizaster' according to Agassiz 1881
- 'Schizaster moseleyi is recombined as Brisaster moseleyi'
- 'Schizaster stalderi belongs to Schizaster'
- 'Schizaster townsendi belongs to Schizaster' according to Agassiz 1898
- 'Schizaster townsendi is recombined as Brisaster townsendi'
- 'Scutaster belongs to Scutellidae'
- 'Scutaster andersoni belongs to Scutaster'
- 'Scutaster vaquerosensis belongs to Scutaster'
- 'Scutaster vaquerosensis kewi belongs to Scutaster vaquerosensis' according to Loel and Corey 1932
- 'Scutaster vaquerosensis kewi belongs to Scutaster vaquerosensis'
- 'Scutella belongs to Scutellidae'
- 'Scutella (Echinarachnius) oregonensis is recombined as Anorthoscutum oregonense'
- 'Scutella blancoensis is recombined as Echinarachnius blancoensis'
- 'Scutella coosensis is recombined as Eoscutella coosensis'
- 'Scutella excentrica is recombined as Dendraster excentrius'
- 'Scutella fairbanksi is recombined as Echinarachnius fairbanksi'
- 'Scutella fairbanksi santanensis belongs to Scutella fairbanksi' according to Kew 1920
- 'Scutella fairbanksi santanensis is recombined as Echinarachnius fairbanksi santanensis'
- 'Scutella gibbsii is recombined as Dendraster gibbsii'
- 'Scutella interlineata is recombined as Anorthoscutum interlineatum'
- 'Scutella newcombei is recombined as Echinarachnius newcombei'
- 'Scutella norrisi is recombined as Echinarachnius norrisi'
- 'Scutella pabloensis is recombined as Astrodapsis pabloensis'
- 'Scutella parma is recombined as Echinarachnius parma'
- 'Scutella perrini is recombined as Merriamaster perrini'
- 'Scutella tejonensis is recombined as Orchoporus tejonensis'
- 'Scutella vaquerosensis is recombined as Echinarachnius vaquerosensis'
- 'Scutellidae belongs to Clypeastrina'
- 'Sismondia coalingaensis is recombined as Merriamaster coalingaensis'
- 'Spatangidae belongs to Cassidulina'
- 'Spatangina belongs to Exocycloida'
- 'Spatangus belongs to Spatangidae'
- 'Spatangus brissus belongs to Spatangus' according to Leske 1778
- 'Spatangus brissus latecarinatus belongs to Spatangus brissus' according to Leske 1778
- 'Spatangus brissus latecarinatus is recombined as Brissus latecarinatus'
- 'Spatangus californicus belongs to Spatangus' according to Clark 1917
- 'Spatangus californicus belongs to Spatangus'
- 'Spatangus pachecoensis belongs to Spatangus'
- 'Spatangus rarus belongs to Spatangus'
- 'Spatangus rarus belongs to Spatangus' according to Israelsky 1923
- 'Spatangus tapinus belongs to Spatangus'
- 'Stirodonta was reranked as a suborder and belongs to Centrechinoida'
- 'Stolonoclypus rotundus belongs to Stolonoclypus' according to Agassiz 1863
- 'Stolonoclypus rotundus is recombined as Clypeaster rotundus'
- 'Strongylocentrotidae belongs to Camarodonta'
- 'Strongylocentrotus belongs to Strongylocentrotidae'
- 'Strongylocentrotus echinoides belongs to Strongylocentrotus' according to Agassiz and Clark 1907
- 'Strongylocentrotus echinoides belongs to Strongylocentrotus'
- 'Strongylocentrotus fragilis belongs to Strongylocentrotus' according to Jackson 1912
- 'Strongylocentrotus fragilis belongs to Strongylocentrotus'
- 'Strongylocentrotus polycanthus belongs to Strongylocentrotus' according to Agassiz and Clark 1907
- 'Strongylocentrotus polycanthus belongs to Strongylocentrotus'
- 'Strongylocentrotus pulchellus belongs to Strongylocentrotus' according to Agassiz and Clark 1907
- 'Strongylocentrotus pulchellus belongs to Strongylocentrotus'
- 'Strongylocentrotus sachalinicus belongs to Strongylocentrotus'
- 'Strongylocentrotus sachalinicus belongs to Strongylocentrotus' according to Döderlein 1912
- 'Tetrapygus belongs to Arbaciidae'
- 'Toxobrissus pacificus belongs to Toxobrissus' according to Agassiz 1898
- 'Toxobrissus pacificus is recombined as Brissopsis pacifica'
- 'Toxocidaris franciscana belongs to Toxocidaris' according to Agassiz 1863
- 'Toxocidaris franciscana is recombined as Strongylocentrotus franciscanus'
- 'Toxocidaris nuda belongs to Toxocidaris' according to Agassiz 1863
- 'Toxocidaris nuda is recombined as Strongylocentrotus nudus'
- 'Toxopneustes was reranked as Echinus (Toxopneustes) and belongs to Echinus' according to Agassiz and Desor 1846
- 'Toxopneustes belongs to Echinidae'
- 'Tretocidaris dubia belongs to Tretocidaris' according to Clark 1907
- 'Tretocidaris dubia is recombined as Hesperocidaris dubia'
- 'Tretocidaris perplexa belongs to Tretocidaris' according to Clark 1907
- 'Tretocidaris perplexa is recombined as Hesperocidaris perplexa'
- 'Tripneustes belongs to Echinidae'
- 'Tripneustes depresss belongs to Tripneustes' according to Agassiz 1863
- 'Tripneustes depresss belongs to Tripneustes'
- 'Tripylaster belongs to Hemiasteridae'
- 'Tripylus philippii belongs to Tripylus' according to Gray 1851
- 'Tripylus philippii is recombined as Tripylaster philippii'