Hydridae
Hydridae is a family of freshwater cnidarians belonging to the order Hydroida. These small, simple invertebrates are commonly known as hydras. They are characterized by their radial symmetry, a sac-like body, and a ring of tentacles surrounding a central mouth. Hydras typically inhabit freshwater ponds, lakes, and slow-moving streams, often attaching themselves to submerged vegetation or rocks.
The body of a hydra consists of two primary cell layers, the epidermis and the gastrodermis, separated
Hydras are remarkable for their regenerative abilities. They can regenerate entire bodies from small fragments and