Oceaniidae is one of the over 50 cnidarian families of the order Anthomedusae. It contains nearly 50 species in ten genera.

Genera

  • Corydendrium (11 species)
  • Corystolona (monotypic)
  • Merona (5 species)
  • Oceania (6 species)
  • Pachycordyle (disputed)
  • Rhizogeton (7 species)
  • Similomerona (monotypic)
  • Tubiclava (5 species)
  • Turritopsis (11 species)
  • Turritopsoides (monotypic)
  • Corydendrium parasiticum, Stalk section of colony showing branching pattern, magnification × 8. br. = branch, coen. = coenosarc, n.t.1/2/3/4 = new tubes enveloping a branch from a coenosarcal strand and wedged in between older tubes, peri. = perisarc, ram.1/2/3 = short bearing hydranths, st. = stem.
  • Turritopsis life cycle. Two branches from the tree-like colony are shown, with a feeding hydra (A) the tip of each twig. Buds at the base of the hydra (at B) eventually detach and grow into adult jellyfish (K)