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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 ?
Roger lovingly describes radiolarians, some of which build skeletons of strontium sulfate while others manage to eat multicelled animals.
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.
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.
The first and second Radiolarian tours are done, and the "Radiolarians 1" recording is available now.
Remains of Ostracoda and some radiolarians were also observed in this facies.
These two exquisitely rendered radiolarians (Dictyocerus Virchowii and Dictyopodium trilobum) are taken from Art Forms from the Ocean, Ernst Haeckel: Munich, Prestel, 2005, [pounds sterling]12.
In this sample and in a few others just above and below it, abundant radiolarians comprise the entire microfossil suite.
Silica is also precipitated by radiolarians, silicoflagellates, horsetails and grasses.
on copper, radiolarians do strontium, Earth accelerates
The beginning of the transgression is marked by tempestites which contain the deeper nektoplanktic fossils, such as fish remains, conodont fragments, and rare radiolarians, also abundant bryozoan debris.
About 70 percent of the sinking material at 3,200 meters consists of carbonaceous or siliceous shells of minute animals such as foraminifera, radiolarians, and pteropods, and the skeletal remains of single cell algae such as the coccolithophores, diatoms, and dinoflagellates.
If primary biogenic sources such as spicules and radiolarians existed, the biological elements have been obliterated by dolomitization and other processes.