Ra
, Radiaster , Radiasteridae , Rathbunaster
Re
, Remaster , Retiometra
Rh
, Rhabdomolgus , Rhipidaster , Rhipidothuria , Rhizocrinus , Rhopalocidaris , Rhopalodina , Rhopalodinaria , Rhopalodinidae , Rhopalodinopsis , Rhopiella , Rhynchocidaris , Rhyncholampas , Rhynobrissus
Ri
, Rictocystis
Ro
, Rosaster , Rotula , Rotulidae , Rowedota
Roweia Thandar, 1985
- Roweia stephensoni (John, 1939)
Echinodermata → Holothuroidea → Dendrochirotida → Cucumariidae
Ry
, Rynkatorpa , Ryukuaster