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Arcyria incarnata.
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Arcyria serpula.
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Didymium nigripes.
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Stemonitis fusca.
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Badhamia panicea.
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Lepidoderma tigrinum.
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Physarum didermoides.
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Trichia botrytis.
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Trichia varia.
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Trichia verrucosa.
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Synonym - Phreatamoeba balamuthi. Isolated from Gambia. ATCC 30984.
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ATCC 30984.
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Portrait of Mastigina setosa a flagellated pelobiont. The ameboid monopodial cells have radiating "setae" which are 6-10 micron long filaments each of which has a basal granule (seen in this image). There is a single, long, lazily beating flagellum, which is closely associated with the nucleus (seen at the 12 o clock position adjacent to the cell membrane in this image). Electron microscopy shows the base of the flagellum connected to the nucleus by a cone of microtubules. The flagellum has a variable arrangement of microtubules. The nucleus contains a large endosome. Ingested algae are seen in food vacuoles. There is vigorous cytoplasmic streaming resulting in ameboid locomotion. The flagellum appears to contribute little to motility. Mastigina and the other pelobionts lack mitochondria and dictyosomes. Obvious ameboid locomotion and cytoplasmic streaming may help differentiate Mastigina from Mastigamoeba, a similar pelobiont. From slow-moving organically enriched freshwater runoff stream near Boise, Idaho. Differential interference contrast. Differential interference contrast optics.
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Portrait of Mastigina setosa a flagellated pelobiont. The ameboid monopodial cells have radiating "setae" which are 6-10 micron long filaments. There is a single, long, lazily beating flagellum, which is closely associated with the nucleus (seen at the 1 o clock position adjacent to the cell membrane in this image). Electron microscopy shows the base of the flagellum connected to the nucleus by a cone of microtubules. The flagellum has a variable arrangement of microtubules. The nucleus contains a large nucleolus. Ingested algae are seen in food vacuoles. There is vigorous cytoplasmic streaming resulting in ameboid locomotion. The flagellum appears to contribute little to motility. Mastigina and the other pelobionts lack mitochondria and dictyosomes. Obvious ameboid locomotion and cytoplasmic streaming may help differentiate Mastigina from Mastigamoeba, a similar pelobiont. From slow-moving organically enriched freshwater runoff stream near Boise, Idaho. Phase contrast.
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Pelomyxa (peal-o-mix-a), a large pelobiont which developed some reputation as possibly the most primitive eukaryote. This argument was based on the fact that it does not have mitochondria, conventional dictyosomes if any, flagella are aberrant, and nuclear division was also thought to be aberrant. The arguments for a primitive status now seem to be unsound. Cytoplasm with small particles of sand. eats algae and detritus. Moves with fountain-flow motion (cytoplasm moving forward up the centre of the cell and then spilling out near the front. Posterior end crumpled, to form a uroid. Phase contrast micrograph.
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Pelomyxa (peal-o-mix-a), a large pelobiont which developed some reputation as possibly the most primitive eukaryote. This argument was based on the fact that it does not have mitochondria, conventional dictyosomes if any, flagella are aberrant, and nuclear division was also thought to be aberrant. The arguments for a primitive status now seem to be unsound. Cytoplasm with small particles of sand. eats algae and detritus. Moves with fountain-flow motion (cytoplasm moving forward up the centre of the cell and then spilling out near the front. With short inactive flagella over the surface of the cell. Posterior end crumpled, to form a uroid. Phase contrast micrograph.
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Pelomyxa (peal-o-mix-a), a large pelobiont which developed some reputation as possibly the most primitive eukaryote. This argument was based on the fact that it does not have mitochondria, conventional dictyosomes if any, flagella are aberrant, and nuclear division was also thought to be aberrant. The arguments for a primitive status now seem to be unsound. Cytoplasm with small particles of sand. eats algae and detritus. Moves with fountain-flow motion (cytoplasm moving forward up the centre of the cell and then spilling out near the front. Posterior end crumpled, to form a uroid. Differential interference contrast.
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Pelomyxa (peal-o-mix-a), a large pelobiont which developed some reputation as possibly the most primitive eukaryote. This argument was based on the fact that it does not have mitochondria, conventional dictyosomes if any, flagella are aberrant, and nuclear division was also thought to be aberrant. The arguments for a primitive status now seem to be unsound. Cytoplasm with small particles of sand. eats algae and detritus. Moves with fountain-flow motion (cytoplasm moving forward up the centre of the cell and then spilling out near the front. Posterior end crumpled, to form a uroid. Phase contrast micrograph.
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Video showing how this amoebae collected at Cedar Swamps in Woods Hole moves around with a single anterior protruding pseudopode. This video made by Dan Lahr under a Zeiss Discovery V12, believe it or not, a dissecting scope.
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Two mature sporocarps
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This is an image of multiple sporocarps from which most of the spores have been shed.
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This is an image of multiple sporocarps.