Green hydra
| Green hydra | ||||||||||||
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H. viridissima recorded with dark field microscopy |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Hydra viridissima | ||||||||||||
| Pallas , 1766 |
The green hydra ( Hydra viridissima , Syn . : Chlorohydra viridissima ) is a freshwater polyp species .
description
The green hydra is 10 to 15 millimeters long and light green thanks to the single-cell algae ( zoochlorella ) that live symbiotic in the cells of their gastrodermis . It has six to twelve tentacles around the mouth that are shorter than the body. The green hydra can survive longer periods of hunger because it is supplied with sugar by the symbiotic algae. The body is cylindrical and slightly wider at the mouth than at the foot.
H. viridissima
H. viridissima
habitat
The green hydra lives in standing, clear, somewhat shady and cool waters with fresh water, e.g. B. Forest ponds. Here it lives sessile on aquatic plants, e.g. B. scroll under water lilies .
See also
literature
- Heinz Streble , Dieter Krauter : Life in a drop of water. Microflora and microfauna of freshwater. An identification book. 10th edition. Kosmos, Stuttgart 2006, ISBN 3-440-10807-4 .
- H. Schwab: freshwater animals. An ecological identification book. Ernst Klett Schulbuchverlag, 1995, ISBN 3-12-125530-4 .
- Matthias Habetha, Friederike Anton-Erxleben, Kathrin Neumann, Thomas CG Bosch: The Hydra viridis / Chlorella symbiosis . Growth and sexual differentiation in polyps without symbionts , in: Zoology 106 (2003): pp. 101-108, doi: 10.1078 / 0944-2006-00104
- Hans-Heinrich Vogt: Zoology, CA Koch's Verlag Nachf., Darmstadt 1970, pp. 74-75: From Hydras Trickkiste
Individual evidence
- ^ L. Muscatine: Symbiosis of Hydra and algae. III Extracellular products of the algae. In: Comp. Biochem. Physiol. 16, 1965, pp. 77-92.