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Raphidiophrys (raff-fid-ee-off-riss) ambigua is a solitary species in this genus of centrohelid heliozoa. It forms three kinds of spindle shaped spicules that accumulate around the pseudopodia. The first form are spindle shaped and pointed at both ends, the second form are medium sized, broadly spindle shaped and rounded at the ends, and the final form are very small (5 - 6 mm long) and elliptically shaped. The spicules are embedded in a gelatinous envelope of the cell. Cytoplasm without symbiotic algae but often coloured greenish, brownish or yellowish by food vacuoles. Three closely arranged specimen of Raphidiophrys ambigua, possibly shortly after cell division. Note the yellow brownish food vacuoles that are characteristic of this species. From a pond near Konstanz, Germany.Differential interference contrast.
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Detail of the siliceous scales of the centroheliozoan, Polyplacocystis symmetrica (Penard, 1904) Mikrjukov, 1996. An axopodium with a bead-like extrusome is visible below the scale to the viewer's left. Collected from a freshwater aquaculture pond near Boise, Idaho. November 2003. DIC.
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Oxnerella (ox-ner-ell-a) is a centrohelid heliozoon - the most speciose group of heliozoa. As with other heliozoa, it has radiating arms which intercept swimming prey which are captured by the extrusomes (the lumps on the arms) and then ingested. This genus includes spicules with fine spicules. Those spicules may be so delicate as not to be readily visible (if at all) by light microscopy. Heterophrys is similar but has delicate organic spicules. These may be very hard to see by light microscopy, and this can easily lead to misidentification. Phase contrast.
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[taxonomy:genus=Raphidocystis]
Water collected from Kent Ridge Park pond on 23 Aug 2011.
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Madrid, Madrid, Spain
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Ribadelago de Franco, Castille and Leon, Spain
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Mahide, Castille and Leon, Spain
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Ribadelago, Castille and Leon, Spain
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Muelas del Pan, Castille and Leon, Spain
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Rozas de Puerto Real, Comunidad de Madrid, Espaa
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Arboli, Catalonia, Spain
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Ribadelago de Franco, Castille and Leon, Spain
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Ribadelago, Castille and Leon, Spain
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Villar del Pedroso, Extremadura, Spain
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Ribadelago de Franco, Castille and Leon, Spain
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Sphaerastrum fockii Aka Heterophrys fockii. Scale bar indicates 25 µm. Sample from a small wetland near Schladming (northern alpine region of Austria near Salzburg). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.Image under Creative Commons License V 3.0 (CC BY-NC-SA). Place name: Wetland near Schladming (Austria) Latitude: 47,37386 Longitude: 13,823016 Bisher bekannt als Heterophrys fockii. Der Messbalken markiert eine Länge von 50 µm. p> Probe aus einer Wiesenvernässung nahe Schladming/Österreich. Mikrotechnik: Zeiss Universal, Kamera: Olympus C7070. Creative Commons License V 3.0 (CC BY-NC-SA). For permission to use of (high-resolution) images please contact postmaster@protisten.de.
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Choanocystis aculeata Scale bar indicates 25 µm. Sample from Kaltenhof Bog in the north of Kiel, Germany. Sampling date 9/2018. The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Axioplan with Olympus OM-D M5 MKII. Image under Creative Commons License V 3.0 (CC BY-NC-SA). Place name: Bog Kaltenhof near Kiel (Schleswig-Holstein, Germany) Latitude: 54,42102744 Longitude: 10,07686615 Multiebenen-Abbildung, manuell gestapelt. Der Messbalken markiert eine Länge von 25 µm. Probe aus dem Kaltenhofer Moor nördlich von Kiel. Datum der Aufsammlung: 9/2018. Mikrotechnik: Zeiss Axioplan, Kamera: Olympus OM-D M5 MKII. Creative Commons License V 3.0 (CC BY-NC-SA). For permission to use of (high-resolution) images please contact postmaster@protisten.de.
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Single whole plate scale viewed by transmission electron microscopy. The siliceous scales are formed within the cell and then form a loose layer or periplast around the outside of the cell.
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Portrait of the centroheliozoan, Polyplacocystis symmetrica (Penard, 1904) Mikrjukov, 1996. Collected from a freshwater aquaculture pond near Boise, Idaho. November 2003. DIC.
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Oxnerella (ox-nerr-ell-a) is a centrohelid heliozoon, distinguished from the other centrohelids because there are no spicules or other materials around the outside of the cell. As with other centroheliozoa, the axopods are thin, parallel sides, and the extrusomes seem relatively large. Phase contrast micrograph.
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Ribadelago de Franco, Castille and Leon, Spain
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Mahide, Castille and Leon, Spain
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Villar del Pedroso, Extremadura, Spain
