Opinions from W. K. Spencer 1925
- 'Aganaster belongs to Aganasteridae'
- 'Aganasteridae belongs to Ophiuroidea'
- 'Echinasterias is a subjective synonym of Palaeosolaster'
- 'Echinasterias spinosus is a subjective synonym of Palaeosolaster gregoryi'
- 'Echinodiscus is a subjective synonym of Palaeosolaster'
- 'Echinodiscus multidactylus is a subjective synonym of Palaeosolaster gregoryi'
- 'Echinostella is a subjective synonym of Palaeosolaster'
- 'Echinostella traquairi is a subjective synonym of Palaeosolaster gregoryi'
- 'Eoluidia is a subjective synonym of Furcaster'
- 'Eoluidia decheni is a subjective synonym of Protaster leptosoma'
- 'Eophiurites is a subjective synonym of Furcaster'
- 'Eospondylus belongs to Hallasteridae'
- 'Furcaster belongs to Furcasteridae'
- 'Furcaster palaeozoicus is a subjective synonym of Protaster leptosoma'
- 'Furcaster trepidans belongs to Furcaster'
- 'Furcasteridae belongs to Ophiuroidea'
- 'Hallaster belongs to Hallasteridae'
- 'Hallasteridae belongs to Ophiuroidea'
- 'Helianthaster roemeri is a subjective synonym of Palaeosolaster gregoryi'
- 'Lapworthura belongs to Hallasteridae'
- 'Miospondylus belongs to Hallasteridae'
- 'Ophiura rhenana is recombined as Miospondylus rhenanus'
- 'Ophiurella primigenia is recombined as Eospondylus primigenius'
- 'Ophiurina belongs to Aganasteridae'
- 'Ophiurina lymani belongs to Ophiurina'
- 'Palaeocoma cylindrica is recombined as Hallaster cylindricus'
- 'Palaeosolaster belongs to Eoactinidae'
- 'Palaeosolaster gregoryi belongs to Palaeosolaster'
- 'Palaespondylus is a subjective synonym of Furcaster'
- 'Palastropecten is a subjective synonym of Furcaster'
- 'Palastropecten zitteli is a subjective synonym of Protaster leptosoma'
- 'Protaster forbesi is a subjective synonym of Palaeocoma cylindrica'
- 'Protaster gregarius is recombined as Aganaster gregarius'
- 'Protaster leptosoma is recombined as Furcaster leptosoma'
- 'Protaster miltoni is recombined as Lapworthura miltoni'
- 'Protaster sedgwickii belongs to Protaster'
- 'Rhodostoma is a subjective synonym of Furcaster'
- 'Squamaster is a subjective synonym of Furcaster'
- 'Squamaster echinatus is a subjective synonym of Protaster leptosoma'
- 'Sturtzura is a subjective synonym of Furcaster'
- 'Sympterura is a subjective synonym of Furcaster'
- 'Sympterura minveri is a subjective synonym of Protaster leptosoma'
- 'Taeniura is a subjective synonym of Hallaster'