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Biological supplies, FOSS and STC refill kits, Owl Pellets, life science and biology supplies. Wednesday, March 22, 2017
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Live Invertebrates >> Cnidarians-Hydra


Hydra Brown

Hydra Brown

Hydra is a genus of simple, fresh-water animals possessing radial symmetry. Hydras are predatory animals belonging to the phylum Cnidaria and the class Hydrozoa.

Hydras are low power microscopical life forms and are often studied by biologists due to their regenerative powers. They can be found in most un-polluted freshwater ponds, lakes and streams in the temperate and tropical regions by gently sweeping a collecting net through weedy areas.

Hydras are small animals with a body length ranging from 1 mm to 20 mm when fully extended. They have a tubular body secured by a simple adhesive foot. At the free end of the body is a mouth opening surrounded by a ring of 5 to 12 thin mobile tentacles. Each tentacle, or cnidae, is clothed with highly specialised stinging cells called cnidocytes. Cnidocytes contain specialized structures called nematocysts which look like miniature light bulbs with a coiled thread inside. At the narrow outer edge of the cnidocyte is a short trigger hair. Upon contact with prey, the contents of the nematocyst are explosively discharged, firing a dart-like thread containing neurotoxins into whatever triggered the release.

Description Price SelectQuantity
Hydra Brown - Class 12 $ 6.00
Hydra Brown - Class 30 $ 7.50
Hydra Brown - Class 60 $ 14.50
Hydra Brown - Class 90 $ 19.50
Hydra Brown - Class 120 $ 24.80
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Hydra Green

Hydra Green

Hydra are small aquatic invertebrates belonging to the order Hydroida, in the class Hydrozoa, phylum Cnidaria.

This is the same phylum as the marine jellyfishes, corals, and sea anemones. Only a few species that belong to this phylum occur in freshwater due to the fact that they evolved in the sea. The body is a thin cylinder with several tentacles extending from the mouth (Five to seven tentacles are typical).

Hydra mainly feed on small aquatic invertebrates such as Daphnia and Cyclops. Some species of hydra exist in a symbiotic relationship with various types of green algae. The hydra offers the algae protection from predators and in return, the algae uses photosynthesis to give the hydra a food source.

 

Description Price SelectQuantity
Hydra Green - Class 12 $ 9.00
Hydra Green - Class 30 $ 10.00
Hydra Green - Class 60 $ 19.00
Hydra Green - Class 90 $ 27.00
Hydra Green - Class 120 $ 34.40
Pressing any of the "Add" buttons submits ALL checked items on the form --->

Hydra with Food (Daphnia)

Description Price SelectQuantity
Hydra with Food - Class 12 $ 10.50
Hydra with Food - Class 30 $ 13.00
Hydra with Food - Class 60 $ 24.00
Hydra with Food - Class 90 $ 36.00
Hydra with Food - Class 120 $ 38.00
Pressing any of the "Add" buttons submits ALL checked items on the form --->

Niles Biological, Inc.
9298 Elder Creek Road
Sacramento, CA 95829
(916) 386-2665