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A jellyfish is the medusoid stadium of animals belonging to phyum Cnidaria, subphylum Medusozoa, which include:

  • class: Scyphozoa
  • class: Cubozoa
  • class: Staurozoa
  • class: Hydrozoa (only some hydrozoans have a medusoid stadium, so not all of them have jellyfishes)
  • class: Polypodiozoa
  • class: dismissed heh heh

Jellyfishes scientific names are ruled by the ICZN (International Code of Zoological Nomenclature). Each species must be identified with the genus name followed by the specific name (binomial nomenclature).

A jellyfish also has an open circulatory system which means is has no veins or arteries in which to carry blood through its small, squishy body.

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14y ago

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