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Hydra americana
Hydra attenuata&_160;(or Hydra vulgaris)
Hydra canadensis
Hydra carnea
Hydra cauliculata
Hydra circumcincta
Hydra hymanae
Hydra littoralis
Hydra magnipapillata
Hydra minima
Hydra oligactis
Hydra oregona
Hydra pseudoligactis
Hydra rutgerensis
Hydra utahensis
Hydra viridis
Hydra viridissima Hydras mainly feed on small aquatic invertebrates such as Daphnia and Cyclops. All species of Hydra exist in a mutual relationship with various types of unicellular algae. The Hydra affords the algae protection from predators and in return, phoyosynthetic products from the algae are beneficial as a food source to the Hydra . The nervous system of the Hydra is a nerve net, which is structurally simple compared to mammalian nervous systems. Hydra does not have a recognizable brain or true muscles. Nerve nets connect sensory photoreceptors and touch-sensitive nerve cells located in the body wall and tentacles. Respiration occurs by diffusion through the epidermis. Some excretion and transportation also occurs in this manner.
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Hydra (genus) Subcategories
Hydra (genus) Articles
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