| Frontonia vernalis: association of the green zoochloralla-bearing ciliates with the the colorless Frontonia leucas (center of the image) and the bdelloid rotifer Rotaria rotatoria in the same  location / habitat (5) | 
									
									
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									  | Frontonia vernalis: oral apparatus. | 
								  
									
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									  | Frontonia vernalis: Two more images of the same section of the cortex in different focal planes. The postoral suture runs quasi as a diagonal through the image.  The lens-shaped structures are possibly mitochondria. (4) | 
								  
									
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									  | Frontonia vernalis: oral apparataus of compressed specimen, lateral view. (4) | 
								  
									
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									  | Frontonia vernalis: specimen from . (4) | 
								  
									
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										| Schlitzmundtierchen (Frontonia leucas): Exemplar mit Zoochlorellen | 
									
									
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										| Frontonia leucas: Oralapparat | 
									
									
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										| Frontonia leucas: Makronukleus und Trichocysten | 
									
									
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									        Location (5): Nature reserve NSG Heiliges Meer, NRW, Germany, "Fischteich" (location 17) (1);  | 
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									        | Habitat(5): anoxic detritus, together with  rhodobacteria, metopid ciliates and Mytilina trigona (1) | 
								           
									      
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									        | Date (5):  coll.: 13.11.2021; img.: 21.11.2021 (1); 24.11.20121 (2) | 
								           
									      
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									        Location (4): Kemnader See near Oveney, Bochum, NRW, Germany, billabong;  | 
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									        | Habitat(4): border between plankton/psammon | 
								           
									      
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									        | Date (4):  11.02.2020  | 
								           
									      
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										| Location (5): Simmelried, Bodensee | 
									
									
										| Habitat: Sphagnum | 
									
									
										| Datum: 01.11.2009 / 16.11.2009 |