Opinions from D. L. Pawson 1966
- 'Achistridae belongs to Apodida'
- 'Apodacea belongs to Holothuroidea'
- 'Apodida belongs to Apodacea'
- 'Aspidochirotacea belongs to Holothuroidea'
- 'Aspidochirotida belongs to Aspidochirotacea'
- 'Binoculites belongs to Dendrochirotida'
- 'Calcancoridae belongs to Apodida'
- 'Calclamnidae belongs to Dendrochirotida'
- 'Calcligula belongs to Molpadiida'
- 'Calclyridae belongs to Holothuroidea'
- 'Caudinidae belongs to Molpadiida'
- 'Chiridotidae belongs to Apodida'
- 'Cucumariidae belongs to Dendrochirotida'
- 'Cucumarites belongs to Aspidochirotida'
- 'Dactylochirotida belongs to Dendrochirotacea'
- 'Deimatidae belongs to Elasipoda'
- 'Dendrochirotacea belongs to Holothuroidea'
- 'Dendrochirotida belongs to Dendrochirotacea'
- 'Elasipodida belongs to Aspidochirotacea'
- 'Etheridgellidae belongs to Holothuroidea'
- 'Exlinellidae belongs to Molpadiida'
- 'Gephyrothuriidae belongs to Molpadiida'
- 'Holothuriidae belongs to Aspidochirotida'
- 'Laetmogonidae belongs to Elasipoda'
- 'Molpadiida belongs to Apodacea'
- 'Molpadiidae belongs to Molpadiida'
- 'Myriotrochidae belongs to Apodida'
- 'Ornaticannula belongs to Aspidochirotida'
- 'Paleochiridota belongs to Elasipoda'
- 'Parvispina belongs to Aspidochirotida'
- 'Phyllophoridae belongs to Dendrochirotida'
- 'Protocaudinidae belongs to Elasipoda'
- 'Psolidae belongs to Dendrochirotida'
- 'Psychropotidae belongs to Elasipoda'
- 'Rhabdotites belongs to Aspidochirotida'
- 'Schlumbergeritidae belongs to Dendrochirotida'
- 'Sclerodactylidae belongs to Dendrochirotida'
- 'Stichopites belongs to Aspidochirotida'
- 'Stichopodidae belongs to Aspidochirotida'
- 'Synallactidae belongs to Aspidochirotida'
- 'Synaptidae belongs to Apodida'
- 'Synaptitidae belongs to Apodida'
- 'Tetravirga belongs to Aspidochirotida'
- 'Theeliidae belongs to Apodida'
- 'Uncinulina belongs to Aspidochirotida'
- 'Ypsilothuriidae belongs to Dactylochirotida'