[2][3] It includes the classes Hydrozoa, Scyphozoa, Staurozoa and Cubozoa, and possibly the parasitic Polypodiozoa. 1. Polyp ist eine der beiden Körperformen der Cnidarians. have eyes, and surprisingly complex ones at that. Staurozoans can be regarded as large polyps that have partially differentiated into sexually mature medusae. In the class Hydrozoa, Hydra is considered as a polyp. Medusen sind Wassertiere, die als frei schwimmende weiche Körper gelten. [41], Prey of cnidarians ranges from plankton to animals several times larger than themselves. [41] Some sea anemones and jellyfish have a symbiotic relationship with some fish; for example clown fish live among the tentacles of sea anemones, and each partner protects the other against predators.

In Scyphozoa and Cubozoa, when exposed to species- or strain-specific transition-inducing stimuli, asexually reproducing benthic polyps transform into sexually reproducing planktonic medusae. "ITIS Report – Taxon: Subphylum Medusozoa", "Phylogeny of Medusozoa and the Evolution of Cnidarian Life Cycles", "The Taxonomicon – Taxon: Phylum Cnidaria", "Evolutionary crossroads in developmental biology: Cnidaria", "WoRMS - World Register of Marine Species", "The hidden biology of sponges and ctenophores", "Phylogenomic Analyses Support Traditional Relationships within Cnidaria", "Cnidarian milestones in metazoan evolution", "Do jellyfish have central nervous systems? and retinas, not so unlike those in your eyes. Predatory species use their cnidocytes to poison or entangle prey, and those with venomous nematocysts may start digestion by injecting digestive enzymes. Colonies may also be free-floating and contain medusoid and polypoid individuals in the colony as in Physalia (the Portuguese Man O’ War) or Velella (By-the-wind sailor). The medusa form reaches sexual maturity after 3 to 4 months and lives about one year. Hydrozoans are polymorphs, existing as solitary polyps, solitary medusae, or as colonies. Class Cubozoa includes jellies that have a box-shaped medusa: a bell that is square in cross-section; hence, they are colloquially known as “box jellyfish.” These species may achieve sizes of 15–25 cm. Instead, these species rely on their medusae to extend their ranges. The main waste product of cells' internal processes is ammonia, which is removed by the external and internal water currents. Cubozoans have a typical life cycle that alternates between the polyp (asexual) and medusa (sexual) stages. In addition to both of these methods, Anthozoa can split horizontally just above the base.
But, medusa reproduces sexually by producing sperms and eggs. (that's "pyriform" in scientist lingo), have pigment spots which

Cnidaria (/naɪˈdɛəriə/[5]) is a phylum under kingdom Animalia containing over 11,000 species[6] of aquatic animals found both in freshwater and marine environments, predominantly the latter. outward since each Medusae release sperms/eggs into the surrounding water during their sexual reproduction.

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