#cnidocytes

• Acalepha — An archaic or scientific zoological term used to designate large marine jellyfish or, broadly, organisms belonging to the class Scyphozoa (phylum Cnidaria). These gelatinous, skeletonless organisms are characterized by their umbrella- or bell-shaped bodies and the presence of stinging cells (cnidocytes) on their tentacles, used for self-defense and paralyzing prey.
• Sea anemone — A class of macroscopic marine coelenterates within the phylum Cnidaria, order Actiniaria, universally known as sea anemones. Their structural body is cylindrical, soft, fleshy, and completely lacks a calcareous skeleton, being anchored to rocky substrates or shells via a muscular pedal disc, while the upper extremity features a central mouth surrounded by concentric crowns of retractile and stinging tentacles used for prey capture and defense.