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Ribadelago, Castilla y Len, Espaa
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Canencia, Madrid, Spain
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Santa Cruz de la Sierra, Extremadura, Spain
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Lower Normandy, France
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image courtesy of Dr. William F. Loomis
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Pelomyxa is an amoeboid organism that inhabits mud in freshwater sites where there is little or no oxygen. The bright bits inside are pieces of sand.
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Phalansterium (fah-lan-stear-ee-um) is a free-living flagellate, usually found in mucoid colonies, with a single apical flagellum surrounded with a tight apical collar. Phase contrast.
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Vannella (van-ell-a), naked free-living amoeba, moves with a single pseudopodium directed forwards (i.e. is unipodial). Hyaline region very extensive. Posteriorly, the uroid is just a stiffened region of cytoplasm. Consumes bacteria. Very similar to Platyamoeba, distinguished usually by the slightly broader aspect. This is V. aberdonica. Phase contrast.
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Korotnevella (caw-rot-know-vell-a) is an amoeba which produces (sometimes) many conical pseudopodia. The most widely encountered genus with conical pseudopodia is Mayorella. 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. With short inactive flagella over the surface of the cell. Posterior end crumpled, to form a uroid. Phase contrast micrograph.
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Scale bar indicates 25 µm. Collected from Bodden, the brackish waters lying between the isles of Hiddensee and Ruegen (German Baltic Sea). The image was built up using several photomicrographic frames with manual stacking technique. The images were taken using Zeiss Universal with Olympus C7070 CCD camera.Image under Creative Commons License V 3.0 (CC BY-NC-SA).
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Description: Amoeba with a pellicle-like surface noticeable by a rather stiff appearance and, in this case, numerous wrinkles. Movement with a tractor-like rolling of the surface. Size of locomotive form in this specimen 90x70 µm. Hyaloplasm as an antero-lateral crescent. Contractile vacuole located in posterior end of the cell. Nucleus spherical to ovoid, nucleolus of granular texture, sometimes divided in 2 or 3 fragments. Phase contrast. Amoeba was cultured in filtered water from original habitat and fed with Oscillatoria (Cyanobacteria), rests of which are seen in a food-vacuole in the centre. It is one of the rugose species of the genus as described by Page and one of the typical representatives of Smirnovâs rugose morphotype.
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Hårup Sande, Silkeborg, Jylland, Danmark
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Suserup Skov, Danmark
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Allindelille Fredskov, Denmark
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Lille Øksø, Rold Skov, Jylland, Danmark
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Store Øksø, Rold Skov
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Kridtstien, Nystrup Plantage, Thy, Danmark
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Mushroom Observer Image 149018: Ceratiomyxa fruticulosa (O.F. Müll.) T. Macbr.
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Mushroom Observer Image 339806: Ceratiomyxa fruticulosa (O.F. Müll.) T. Macbr.
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Mushroom Observer Image 30715: Comatricha Preuss
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Mushroom Observer Image 408981: Metatrichia floriformis (Schwein.) Nann.-Bremek.
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Mushroom Observer Image 1006098: Leocarpus fragilis (Dicks.) Rostaf.