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Polycystina :: Polycystina (n. pl.) A division of Radiolaria including numerous minute marine species. The skeleton is composed of silica, and is often very elegant in form and sculpture. Many have been found in the fossil state..

Radiolarian :: Radiolarian (a.) Of or pertaining to the Radiolaria.

Rhizopoda :: Rhizopoda (n. pl.) An extensive class of Protozoa, including those which have pseudopodia, by means of which they move about and take their food. The principal groups are Lobosa (or Am/bea), Helizoa, Radiolaria, and Foraminifera (or Reticularia). See Protozoa..

Monozoa :: Monozoa (n. pl.) A division of Radiolaria; -- called also Monocyttaria.

Radiolaria :: Radiolaria (n. pl.) Order of rhizopods, usually having a siliceous skeleton, or shell, and sometimes radiating spicules. The pseudopodia project from the body like rays. It includes the polycystines. See Polycystina..

Radiolarian :: Radiolarian (n.) One of the Radiolaria.

Polycyttaria :: Polycyttaria (n. pl.) A division of Radiolaria. It includes those having one more central capsules.

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