Hydra are members of a family of radially symmetric animals (Cnidaria), all of which use specialized cnidocytes to catch prey.

The discovery of the hitherto unknown protein in the freshwater polyp Hydra suggests that the molecular mechanism of elasticity could have originated in the cnidarians and evolved to discharge a ...

Hydra are simple animals that, along with jellyfish, belong to the phylum cnidaria. Cnidarians first emerged 600 million years ago. "We determined which genetic ‘gateway,' or ion channel, in the hydra ...

The researchers found that when the animals were confined lengthwise, the result was a regeneration of two heads and often more than one foot. The discovery calls back to Greek mythology, in which ...

The hydra fire their stingers less in bright than in dim light, the researchers found. When they blocked one of the pathway’s components, the hydra acted as if they were in dim light and fired their ...

Hydra Hydra species, freshwater cnidarians, are one of the few groups of animals with no defined aging. The longest studies to date (~8 years) observed no increase in mortality rate, or decrease in ...

Firstly, they brought germfree Hydra, i.e. laboratory-bred organisms without bacterial colonisation, into contact with Curvibacter bacteria.

In the freshwater polyp Hydra vulgaris, a single population of stem cells is responsible for both gamete production and the sea anemone’s impressive regenerative abilities. However, this productive ...

Hydra Hydra species, freshwater cnidarians, are one of the few groups of animals with no defined aging. The longest studies to date (~8 years) observed no increase in mortality rate, or decrease in ...