radiolaria

Radiolarians (also radiolaria) are amoeboid protozoa that produce intricate mineral skeletons, typically with a central capsule dividing the cell into inner and outer portions, called endoplasm and ectoplasm. They are found as zooplankton throughout the ocean, and because of their rapid turn-over of species, their tests are important diagnostic fossils found from the Cambrian onwards. Some common radiolarian fossils include Actinomma, Heliosphaera and Hexadoridium.
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Noun
1. marine protozoa
(synonym) order Radiolaria
(hypernym) animal order
(member-holonym) Actinopoda, subclass Actinopoda
(member-meronym) radiolarian

(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.
  

B: (Kimia) radiolaria
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