Radiolarian
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Radiolarians (also radiolaria) are amoeboid protozoa that produce intricate mineral skeletons, typically with a central capsule dividing the cell into inner and outer portions, called endoplasm and ectoplasm. They are found as zooplankton throughout the ocean, and their skeletal remains cover large portions of the ocean bottom as radiolarian ooze. Due to their rapid turn-over of species, they represent an important diagnostic fossil found from the Cambrian onwards. Some common radiolarian fossils include Actinomma, Heliosphaera and Hexadoridium. Radiolarians have many needle-like pseudopodia supported by bundles of microtubules, called axopods, which aid in the Radiolarian''s buoyancy. The nuclei and most other organelles are in the endoplasm, while the ectoplasm is filled with frothy vacuoles and lipid droplets, keeping them buoyant. Often it also contains symbiotic algae, especially zooxanthellae, which provide most of the cell''s energy. Some of this organization is found among the heliozoa, but those lack central capsules and only produce simple scales and spines.
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GarantieWeitere Informationen
- Allgemeine Informationen
- GTIN 09786131370311
- Editor Lambert M. Surhone, Mariam T. Tennoe, Susan F. Henssonow
- Größe H220mm x B220mm
- EAN 9786131370311
- Titel Radiolarian
- Herausgeber Betascript Publishing
- Anzahl Seiten 80
- Genre Biologie
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