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| Ptygura velata / Ptygura crystallina, Gosse 1851 |
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| Ptygura velata, whirling specimen. |
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| Ptygura velata, the animals of this species do not build a housing like P. pilula. |
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| Ptygura velata, corona with reinforced clasps. |
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| Ptygura velata, lateral view, focal plane on the small eyespot. |
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| Ptygura velata, foot with adhesive disc. |
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| location: Rheinberg, gravel pit. |
| habitat: Ceratophyllum |
| Date: 6.7.2009 |
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