Originally: = "radiolarian" (obsolete). Later: specifically of, relating to, or designating radiolarians of the class Polycystinea, whose central capsule surrounding the nucleus has many evenly spaced perforations.
Ehrenberg appears to have used his ‘family’ name Polycystina as a synonym for the Radiolaria as a whole.
Originally: = "radiolarian" (obsolete). Later: specifically a radiolarian of the class Polycystinea.
Mid 19th century. From scientific Latin Polycystina (or later Polycystinea), group name from poly- + ancient Greek κύστις bladder + scientific Latin -ina (or -inea).