Oral arm

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.

[1] These four long oral arms, hang from the center of the underside, where the mouth of the jellyfish is located.

In most cases, 24 other, thinner extensile tentacles hang from the rim of the bell.

The eggs develop either inside the female, or in brood pouches located on the oral arms.