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Mauve Stinger Video Stock Footage

Pelagia noctiluca are fairly small jellyfish with adults having a bell diameter of 3–12 cm (1.2–4.7 in). Their colour is variable, ranging from mauve, purple, pink, light brown to yellow. The body is radially symmetrical. There is only one body cavity known as the gastrovascular cavity. This is a primitive gut or digestive cavity with only one opening that is used for ingestion and excretion there are four long oral arms with crenulated margins that are the primary feeding surface. Each P. noctiluca medusa has eight long tentacles that emerge from the umbrella margin. Being radially symmetrical it has no head and thus no centralized nervous system. The nervous system present is primitive, consisting of a simple net composed of naked and largely non-polar neurons. In addition P. noctiluca also lacks a gaseous exchange, excretory and circulatory system. However cnidaria have evolved cnidae, cells which serve for a variety of functions that include prey capture, defense, locomotion and attachment. When fully formed cnidae are called cnidocytes. When stimulated the cnidae secrete nematocyst toxins that are biological poisons. These organisms have a well-developed manubrium, a proboscis-like structure bearing the mouth and four long oral arms. Also the mesoglea, or jelly, is relatively thickened and well developed in this species. Sense organs, known as rhopalia in the scyphomedusae, are located around the umbrella margin in notches and alternate between ...

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Animalia: Cnidaria: Semaeostomeae: Scyphozoa: Pelagiidae: Pelagia noctiluca

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