Gastrovascular Cavities
Gastrovascular Cavities are found in organisms under two major phyla: Cnidaria and Platyhelminthes. The gastro vascular cavity is a digestive cavity that has one opening that serves as a mouth and secretion of waste. In cnidarians, the cavity aids in digestion and the distribution of nutrients throughout the body.
Cnidarians have a sac-like body, which two layers; the epidermis and the gastrodermis. In between these two layers, there is a jelly like layer called the mesoglea, which houses extra cellular digestion.Hydra have branches of the gastro vascular cavity extending to their tentacles, which can serve to capture prey.