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| Tortitaenia alpina (Schmidle) Brook 1998 |
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| Tortitaenia alpina, a species with a single a central chloroplast with radiating spiral ridges. This is in contrast to Spirotaenia, which has a single ribbon-shaped parietal chloroplast. |
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| Tortitaenia alpina, detail of the periphery of the chloroplast. |
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| Tortitaenia alpina, focus plane on the center of the cells |
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| Location: Ahrntal, South Tyrol, Italy, pond |
| Habitat: Periphyton |
| Date: 09.10.2014 |
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