Oral arm

A Pacific sea nettle Chrysaora fuscescens has four long, frilly oral arms.

An Oral arm is an anatomical structure of "true" sea jellies (or Scyphozoans), which belong to the class Scyphozoa. Oral arms characterize Semaeostomeae, an order of large jellyfish.

The oral arms (of which there are usually four) are located around the mouth and hold the stinging cells, or cnidocysts, which are used to inject potential prey (or potential predators) with venom.

See also

• Jellyfish
• Scyphozoan
• Semaeostomeae

References

• Ben Waggoner, Brian Speer, and David Smith. "Life History and Ecology" and "More on Morphology." Scyphozoa.

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