The freshwater polyp Hydra carries hundreds of stinger cells in each of its tentacles, which are used for prey capture and defence. A stinger cell contains a miniature weapon, the nematocyst.

HEADY Role in Hydra Hydra, a multicellular, lower-eukaryotic, freshwater polyp, is known for its developmental idiosyncrasies. Slice off its head or its foot, and within two days either regenerates ...