The tentacle comes into contact with the prey.The group gets its name for these stinging cells! It is the most important defining feature.Inside each cnidocyte there is a spring-loaded spear called a nematocyst.Tentacles are covered with special cells called cnidocytes. ![]() Two-way digestive system – This means food and waste enter/exit from the same openingįigure 5: A hydra’s two-way digestive system How do tentacles catch prey?.Tentacles surround the mouth – which leads to a gastrovascular cavity for digestion.Carnivores that depend on prey coming into contact with their stinging tentacles.Radial Symmetry – Symmetry around a central axis.įigure 4: Radial Symmetry B. ![]() Body has two cell layers ( ectoderm and endoderm) separated by a layer of jelly-like “ mesoglea” Looks like a bell with tentacles and mouth facing downward.
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