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Phaeodaria
Phaeodarea, or Phaeodaria, is a group of amoeboid cercozoan organisms. They are traditionally considered radiolarians, but in molecular trees do not appear to be close relatives of the other groups, and are instead placed among the Cercozoa. They are distinguished by the structure of their central capsule and by the presence of a phaeodium, an aggregate of waste particles within the cell. The term "Radiozoa" has been used to refer to radiolaria when Phaeodarea is explicitly excluded. Phaeodarea produce hollow skeletons composed of amorphous silica and organic material, which rarely fossilize. The endoplasm is divided by a cape with three openings, of which one gives rise to feeding pseudopods, and the others let through bundles of microtubules that support the axopods. Unlike true radiolarians, there are no cross-bridges between them. They also lack symbiotic algae, generally living below the photic zone, and do not produce any strontium sulphate. Taxonomy Phylogeny Through p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cercozoa
Cercozoa is a phylum of diverse single-celled eukaryotes. They lack shared morphological characteristics at the microscopic level, and are instead defined by molecular phylogenies of rRNA and actin or polyubiquitin. They were the first major eukaryotic group to be recognized mainly through molecular phylogenies. They are the natural predators of many species of microbacteria and Archea. They are closely related to the phylum Retaria, comprising amoeboids that usually have complex shells, and together form a supergroup called Rhizaria. Characteristics The group includes most amoeboids and flagellates that feed by means of filose pseudopods. These may be restricted to part of the cell surface, but there is never a true cytostome or mouth as found in many other protozoa. They show a variety of forms and have proven difficult to define in terms of structural characteristics, although their unity is strongly supported by phylogenetic studies. Diversity Some cercozoans are grouped ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cercozoa
Cercozoa is a phylum of diverse single-celled eukaryotes. They lack shared morphological characteristics at the microscopic level, and are instead defined by molecular phylogenies of rRNA and actin or polyubiquitin. They were the first major eukaryotic group to be recognized mainly through molecular phylogenies. They are the natural predators of many species of microbacteria and Archea. They are closely related to the phylum Retaria, comprising amoeboids that usually have complex shells, and together form a supergroup called Rhizaria. Characteristics The group includes most amoeboids and flagellates that feed by means of filose pseudopods. These may be restricted to part of the cell surface, but there is never a true cytostome or mouth as found in many other protozoa. They show a variety of forms and have proven difficult to define in terms of structural characteristics, although their unity is strongly supported by phylogenetic studies. Diversity Some cercozoans are grouped ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radiolaria
The Radiolaria, also called Radiozoa, are protozoa of diameter 0.1–0.2 mm that produce intricate mineral skeletons, typically with a central capsule dividing the cell (biology), cell into the inner and outer portions of endoplasm and Ectoplasm (cell biology), ectoplasm. The elaborate mineral skeleton is usually made of Silicon dioxide, silica. They are found as zooplankton throughout the global ocean. As zooplankton, radiolarians are primarily heterotrophic, but many have photosynthetic endosymbionts and are, therefore, considered mixotrophs. The skeletal remains of some types of radiolarians make up a large part of the cover of the ocean floor as siliceous ooze. Due to their rapid change as species and intricate skeletons, radiolarians represent an important diagnostic fossil found from the Cambrian onwards. Description Radiolarians have many needle-like pseudopods supported by bundles of microtubules, which aid in the radiolarian's buoyancy. The cell nucleus and most oth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phaeogymnocellida
Phaeogymnocellida is an order of cercozoans in the class Phaeodarea. References External links * Phaeogymnocellidaat the World Register of Marine Spacies (WoRMS) Phaeodaria Cercozoa orders {{Cercozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phaeocystida
Phaeocystida, also known as Phaeocystina, is a group of cercozoans in the class Phaeodarea. It was first described by Ernst Haeckel in 1887 and treated traditionally as a suborder, but later was raised to order level until Cavalier-Smith Thomas (Tom) Cavalier-Smith, FRS, FRSC, NERC Professorial Fellow (21 October 1942 – 19 March 2021), was a professor of evolutionary biology in the Department of Zoology, at the University of Oxford. His research has led to disc ...'s classification lowered it again to suborder level. It belongs to the order Eodarida, characterised by simpler silica skeletons or a lack thereof. References * Report on the Radiolaria. E Haeckel, 1887 * Report on the scientific results of the voyage of the HMS Challenger during the years 1873–1876. E Haeckel, Zoology series, 1887 External links * Phaeocystidaat the World Register of Marine Spacies (WoRMS) Phaeodaria Cercozoa orders {{Cercozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phaeocalpida
Phaeocalpida is an order of cercozoans in the class Phaeodarea. References * Report on the Radiolaria. E Haeckel, 1887 * Report on the scientific results of the voyage of the HMS Challenger during the years 1873-1876. E Haeckel, Zoology series, 1887 External links * Phaeocalpidaat the World Register of Marine Spacies (WoRMS) Phaeodaria Cercozoa orders {{Cercozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phaeodendrida
Phaeodendrida is an order of cercozoans in the class Phaeodarea. References * Report on the Radiolaria. E Haeckel, 1887 * Report on the scientific results of the voyage of the HMS Challenger during the years 1873–1876. E Haeckel, Zoology series, 1887 External links * Phaeodendridaat the World Register of Marine Spacies (WoRMS) Phaeodaria Cercozoa orders {{Cercozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phaeogromida
Phaeogromida is an order of cercozoans in the class Phaeodarea. References * Report on the Radiolaria. E Haeckel, 1887 * Report on the scientific results of the voyage of HMS Challenger during the years 1873-1876. E Haeckel, Zoology series, 1887 External links * Phaeogromidaat the World Register of Marine Spacies (WoRMS) Phaeodaria Cercozoa orders {{Cercozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phaeosphaerida
Phaeosphaerida is an order of cercozoans in the class Phaeodarea. References * Report on the Radiolaria. E Haeckel, 1887 * Report on the scientific results of the voyage of the HMS Challenger during the years 1873–1876. E Haeckel, Zoology series, 1887 External links * Phaeosphaeridaat the World Register of Marine Spacies (WoRMS) Phaeodaria Cercozoa orders {{Cercozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
