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| Keratella testudo Ehrenberg, 1832 |
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| Keratella testudo; focal plane on the dorsal side of the lorica. |
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| Keratella testudo; focal plane on the two posterior spines. |
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| Location: Wahner Heide near Cologne, NRW, Germany, pond with Potamogeton |
| Habitat: between submersed plants/ periphyton |
| Datum: 12.06.2010 |
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