The Radiolaria, also called Radiozoa, are unicellular eukaryotes of diameter 0.1–0.2 mm that produce intricate mineral skeletons, typically with a central capsule dividing the cell into the inner and outer portions of endoplasm and ectoplasm. The …

Radiolarian, any protozoan of the class Polycystinea (superclass Actinopoda), found in the upper layers of all oceans. Radiolarians, which are mostly spherically symmetrical, are known for their complex and beautifully sculptured, though minute, skeletons, referred to as tests.

Radiolaria are well known for their paleontological signatures, but little is known about the ecology of modern assemblages. They are found from polar to tropical regions, in the sunlit layers of the ocean down to the deep and cold bathypelagic.

Radiolarians species, members of the subclass Radiolaria, are single-celled eukaryotes commonly found in marine environments (with some being colonial). Although some of the species are restricted to a specific region, these organisms are widely spread in major oceanic ecosystems across the world.

Oct 17, 2019 · Radiolarians, single-celled marine organisms with intricate silica skeletons, have existed for at least 550 million years and are found in all the world’s oceans.

Radiolaria are protozoa distinguished 1) by segregation of their soft anatomy into the central capsule, containing the endoplasm, and the surrounding ectoplasm (or calymma), and 2) by their siliceous (opaline) skeletons of the large majority of species.

Radiolarians are small marine organisms that graze on phytoplankton and organic detritus in oceans. They have intricate siliceous shells, with the polycystine radiolarians being the ones that fossilize well and are commonly used in paleontological studies. You might find these chapters and articles relevant to this topic.

Radiolaria.org is an online database containing information about radiolarians - fossil and recent, with images, descriptions, references, synonyms and links to other online resources. more... Radiolaria are holoplanktonic protozoa widely distributed in the oceans.

Radiolaria are unicellular holoplanktonic protozoa with siliceous or strontium sulfate skeletons. Mainly studied by micropaleontologists because of their excellent fossil record, they are also key members of planktonic communities and play important roles in various oceanic ecosystems.

Jan 1, 2016 · Radiolaria are single-celled marine eukaryotes, also some colonial forms, existing from the Cambrian (ca. 530 Ma) to recent. Thus, radiolarians are one of the longest ranging groups of fossil microorganisms. The founders of radiolarian taxonomy were two German scientists, C.G. Ehrenberg (1795–1876) and E. Haeckel (1834–1919).