Figure 2.

Life cycle and morphology of jellyfish. (A) The life cycle of the cnidarian polyp and jellyfish, representative of Hydrozoa. In the polyp type life cycle, a polyp reproduces both asexually and sexually. In the jellyfish life cycle, polyps asexually give rise to medusae, and medusae produce gametes for sexual reproduction. (B) Picture of Cladonema medusa as a representative hydrozoan jellyfish. The medusa is comprised of the umbrella, manubrium, radial canals, and tentacles including ocellus at the bulb region. Scale bar, 1.0 mm.