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.

2019年10月17日 · 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.

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.

Radiolarian species are non-motile; they drift along water currents while those currents compartmentalize the ocean into finer ecological domains. Ocean currents carry radiolaria from one water mass to another, so that species tend to have variable reproductive success.

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.

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.

Radiolarians are single-celled protozoa, measuring less than 0.1 – 0.2 mm in diameter, that produce intricate shells (skeletons) of amorphous silica. They float as part of the zooplankton in the first 200 meters of water in the Earth’s oceans (photic zone).

Varying slightly from one subclass to another, the skeletons of radiolarians are generally organized around spicules, or spines, which are sharp, dense outcroppings from the main skeletal mass. Formed from the fusion of many of these spines is …

Phylum Retaria and Phylum Cercozoa consists of the siliceous planktonic organisms, commonly referred to as Radiolarians, were investigated from 200 m depth to the surface in the eastern Indian Ocean (80.00°–96.10° E, 10.08° N–6.00° S) during a 2 …