Radiolaria - Wikipedia
网页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 elaborate mineral skeleton is usually made of silica. [1]
Radiolarian | Marine Protists, Plankton, Microscopic | Britannica
网页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 …
Radiolarian - an overview | ScienceDirect Topics
网页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.
Radiolaria.org > What are radiolarians
网页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 have existed since the beginning of the Paleozoic era, producing an astonishing ...
Unraveling the Mysteries of Radiolarians | AMNH
网页2019年10月17日 · While still poorly understood in many ways, radiolarians are thought to hold significant clues to the evolution of life on Earth, as well as insights into changing climatic conditions over time. They have existed for at least 550 million years and are found in all the world’s oceans and other bodies of saltwater, from the surface to the seafloor.
Diversity and ecology of Radiolaria in modern oceans
网页2022年4月24日 · 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.
Radiolaria - Geology is the Way
网页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).
Biogeography and diversity of Collodaria (Radiolaria) in the global ...
网页2017年3月24日 · Radiolarians are skeleton-bearing marine heterotrophic protists belonging to the eukaryotic phylum Retaria, which is included within the super-group Rhizaria (Nikolaev et al., 2004; Adl et al.,...
Radiolaria - SpringerLink
网页Radiolaria are free-living marine pseudopodbearing protozoans characterized by (1) a radiating network of slender pseudopodia, (2) an organic “central capsule membrane” within the cytoplasm, and (3) a skeleton composed of transparent glass (opal) with or without organic inclusions or of crystalline strontium sulfate (celestite).
(PDF) RADIOLARIA - ResearchGate
网页2021年2月26日 · Radiolaria are holoplanktonic protists ranging from 50 µm to 200 µm in size, found in tropical, subtropical and arctic marine waters of the world. Their hard skeleton or test is one of their...
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