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| Uhrglastierchen (Arcella gibbosa) |
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| Arcella gibbosa; apical view on the shell. (2) |
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| Arcella gibbosa; lateral view on the dome-shaped shell (2) |
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| Arcella gibbosa; another specimen from (1) |
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| Location: Hattingen, Oberstüter, pond (2); |
| Habitat: detritus (2) |
| Date: 25.08.2016 (2); |
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