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Rumoroso, Cantabria, Spain
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Lumbreras, La Rioja, Spain
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Mahide, Castille and Leon, Spain
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Muelas del Pan, Castille and Leon, Spain
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Villoslada de Cameros, La Rioja, Spain
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Villoslada de Cameros, La Rioja, Spain
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Villoslada de Cameros, La Rioja, Spain
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Villoslada de Cameros, La Rioja, Spain
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Mahide, Castille and Leon, Spain
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Mahide, Castille and Leon, Spain
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Villoslada de Cameros, La Rioja, Spain
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This giant sun animalcules, Actinosphaerium eichhorni, had a diameter of 300 m! It was feasting on Stentors. The brown in the middle is a stentor just being digested.
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Actinosphaerium (act-in-o-sphere-ee-um) (=Echinosphaerium), one of the largest freshwater heliozoa, may measure up to 500 microns, often with outer layer being very vacuolated. Multiple nuclei and nucleating sites for the arms line at the interface between the inner and outer regions of cytoplasm. Yellowy zone in the centre is some food being digested - these heliozoa can consume small metazoa. Dark ground illumination.
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Actinosphaerium, the large multinucleate actinophryid heliozoon. These cells may be quite large - up to half a millimetre or so. Stiff arms (axopodia) radiate out from the body, the the outer region is highly vacuolated. Prey mostly on other protists and small metazoa. Bright field.
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Actinosphaerium, the large multinucleate actinophryid heliozoon. These cells may be quite large - up to half a millimetre or so. Stiff arms (axopodia) radiate out from the body, the the outer region is highly vacuolated. Prey mostly on other protists and small metazoa.Phase contrast micrograph.
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Portrait of Actinosphaerium, a naked, usually large heliozoan. Multiple small nuclei are located at the inner boundary of the peripheral well-demarcated layer of large vacuoles. Food vacuoles are seen in the central cytoplasm in this image. The axonemes of the tapering axopodia terminate on or near the nuclei. From freshwater pond near Boise, Idaho. Brightfield
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Isolated from Carolina Actinosphaerium culture # 29-5366. Freshwater heliozoon classified in the stramenopiles. Image by L. W. Parfrey
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Actinosphaerium (act-in-o-sphere-ee-um) (=Echinosphaerium), one of the largest freshwater heliozoa, may measure up to 500 microns, often with outer layer being very vacuolated. Arms taper from base to tip. Multiple nuclei and nucleating sites for the arms line at the interface between the inner and outer regions of cytoplasm. Brown inclusions are food vacuoles. Phase contrast illumination.
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Actinosphaerium (act-in-o-sphere-ee-um) (=Echinosphaerium), one of the largest freshwater heliozoa, may measure up to 500 microns, often with outer layer being very vacuolated. Multiple nuclei and nucleating sites for the arms line at the interface between the inner and outer regions of cytoplasm. This micrograph shows an axoneme and a nucleus - which has a round nucleolus at its centre. Differential interference contrast.
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Actinosphaerium (act-in-o-sphere-ee-um) (=Echinosphaerium), one of the largest freshwater heliozoa, may measure up to 500 microns, often with outer layer being very vacuolated. Multiple nuclei and nucleating sites for the arms line at the interface between the inner and outer regions of cytoplasm. This micrograph shows an axoneme ending adjacent to a nucleus. Differential interference contrast.
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Actinosphaerium (act-in-o-sphere-ee-um) (=Echinosphaerium), one of the largest freshwater heliozoa, may measure up to 500 microns, often with outer layer being very vacuolated. This group photograph shows some of the variation in size. Multiple nuclei and nucleating sites for the arms line at the interface between the inner and outer regions of cytoplasm. Yellowy zones in the centre is some food being digested - these heliozoa can consume small metazoa. Dark ground illumination.
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One of the largest freshwater heliozoa, may measure up to 500 microns, often with outer layer being very vacuolated. Dark ground.
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Actinosphaerium (ack-tin-o-sphere-ee-um). In contrast to the normal form of Actinosphaerium eichhorni, this (sub)species has symbiotic algae in the cytoplasm and appear green. The body of Actinosphaerium eichhorni var. viride is smaller than Actinosphaerium eichhorni. This specimen has a diameter of 173 microns.