| Polyarthra dolichoptera; lateral view of "aptera-form with amictic egg. In contrast to the "regular" Polyarthra dolichoptera the first generation of individuals hatching from resting eggs do not possess the fins the later generations have. In former times these specimens have been considered a separate species. |
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| Polyarthra dolichoptera aptera; same specimen from above; dorsoventral view. The "aptera"-specimens have neither fins nor muscles which drive the fins. Because of slight compression by the coverslide the egg has leaked unfortunately. |
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| Polyarthra dolichoptera aptera; specimen from (2); lateral view. |
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| Polyarthra dolichoptera aptera; specimen from (2); dorsoventral view. |
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| Polyarthra dolichopteraaptera; virgate trophi of macerated specimen from (2). The red remnants of thre eyespot are also visible. |
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Location (1): Hattingen Felderbachtal, HaselbeckeNRW, Germany; pond |
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| Habitat (1): plankton (click to enlarge >>>>) |
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| Date: 31.07.2021 (1); |
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