Rathkia blumenbachiana – synonym of Rathkea octopunctata
Rhizostoma octopus – synonym of Rhizostoma pulmo
Rhoda inermis – synonym of Thysanoessa inermis
Rhoda jardineana – synonym of Thysanoessa raschi
Rhoda raschii – synonym of Thysanoessa raschi
Rosacea plicata – synonym of Rosacea plicata
Rossia hyatti – synonym of Rossia palpebrosa
Rotundula brochii – synonym of Modeeria rotunda