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Any of various marine protozoans of the order (or phylum) Radiolaria, having rigid siliceous skeletons and spicules.

[From New Latin Radiolāria, order name, from Late Latin radiolus, diminutive of Latin radius, ray, spoke (in reference to their spicules); see ray1.]


(Animals) any of various marine protozoans constituting the order Radiolaria, typically having a siliceous shell and stiff radiating cytoplasmic projections: phylum Actinopoda (actinopods)
[C19: from New Latin Radiolaria, from Late Latin radiolus little sunbeam, from Latin radius ray, radius]


(ˌreɪ di oʊˈlɛər i ən)

any of various very small marine protozoans of the class Radiolaria (or superclass Actinopoda), having slender radiating pseudopods and usu. bearing an elaborate outer skeleton.
[1875–80; < New Latin Radiolari(a) (Latin radiol(us) a small beam (radi(us) radius + -olus -ole1) + -aria -aria) + -an1]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.radiolarian - protozoa with amoeba-like bodies and radiating filamentous pseudopodsradiolarian - protozoa with amoeba-like bodies and radiating filamentous pseudopods
actinopod - protozoa having stiff rodlike radiating pseudopods
order Radiolaria, Radiolaria - marine protozoa


n (Zool) → Strahlentierchen nt, → Radiolarie f (spec)
References in periodicals archive ?
Deposition Interpretation: The presence of radiolarians in this facies and the inclusion of fine grained poorly preserved calcite material, similar to those found in facies 5 suggest that this facies may represent very fine sediments being transported into the deep basin by suspension.
BSi, known as phytolith or opal, can be comprised of different components mainly of biological origin such as diatoms phytoliths, radiolarians, silicoflagellates and sponge spicules.
Roger lovingly describes radiolarians, some of which build skeletons of strontium sulfate while others manage to eat multicelled animals.
Mesozoic radiolarians from the Bagh Complex in the Muslim Bagh area Pakistan: their significance in reconstructing the geological history of ophiolites along the Neo-Tethys suture zone.
This porcelain species consists of huge spiky sculptures, assembled from thrown parts of porcelain body to which cork or charcoal has been added; they are inspired by radiolarians (plankton), microscopic living creatures with mineral skeletons.
3] and non-soluble residues (silica fragments like quartz grains, sponge spicules, diatoms, radiolarians and lime).
The fossil record shows that the three major biominerals - calcium phosphate, now found in bones and teeth; calcium carbonate, in invertebrate shells; and silicon dioxide, in radiolarians - appeared more or less simultaneously around this time and in a diverse array of distantly related organisms.
In the micropaleontologic analysis disarticulated ostracod shells, rare and small recrystalized radiolarians with several foraminifers, were found together.
5-30 mm) * Few sponge spicules * Common diatoms, few radiolarians * Few nematodes * Rare polychaetes and bivalves * Rare amphipod crustaceans * Moderately abundant planktic foraminifera * Calcareous and agglutinated benthic foraminifera Box core 6.
Many groups of organisms including cnidarians, ctenophores, radiolarians, shrimp, ostracods, squid, chaetognaths, ophiuroids, larvaceans, and deep-sea fishes produce light by oxidizing coelenterazine, although each organism makes its own luciferase to catalyze the reaction (Shimomura, 2006; Haddock et al.
The first and second Radiolarian tours are done, and the "Radiolarians 1" recording is available now.