San Tan Valley 10 Day Weather. 1  Wednesday:The San Tan Valley forecast for Apr 19 is 83 degrees and Sunny. There is 20 percentage chance of rain and 4 mph winds from the West-Southwest. 2  Thursday:The San Tan Valley forecast for Apr 20 is 77 degrees and Sunny. There is 11 percentage chance of rain and 7 mph winds from the West.
Hydra, genus of invertebrate freshwater animals of the class Hydrozoa (phylum Cnidaria). The body of such an organism consists of a thin, usually translucent tube that measures up to about 30 millimetres (1.2 inches) long but is capable of great contraction.
Although hydra are fairly simple animals, the stinging cells which they use to catch their prey are quite complex structures. They have a number of different types of stinging cells, called nematocysts, on their tentacles. Coiled tubes are shot out at any passing prey which has had the misfortune to touch a tentacle.