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| Lecane ludwigii var. ludwigii Eckstein 1883 |
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| Lecane ludwigii f. ludwigii with one posterior projection (arrowhead). L. ludwigii f. stokesi has two posterior projections. |
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| Lecane ludwigii f. ludwigii; same specimen, head retracted. Visible are the antero-lateral spines and the posterior projection. |
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| Location: Bochum, Ruhr-University, pond |
| Habitat: periphyton |
| Date: 26.08.2013 |
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