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en.wikipedia.org/wiki/Obelia

Obelia is a genus in the class Hydrozoa, which consists of mainly marine and some freshwater animal species and have both the polyp and medusa stages in their life cycle. The genus belongs to the phylum Cnidaria, which are all aquatic and mainly marine organisms that are relatively simple in structure. ... Through its life cycle, Obelia take two forms: polyp and medusa.

en.wikipedia.org/wiki/Polyp

A polyp in zoology is one of two forms found in the phylum Cnidaria, the other being the medusa. ... individual is always a polyp; in the class Hydrozoa, however, the individual may be either a polyp or a medusa, .... Coral Reef Alliance Coral Polyps · are-corals The International Coral Reef Initiative (ICRI) What are corals?

en.wikipedia.org/wiki/Cnidaria

Cnidaria is a phylum containing over 10,000 species of animals found exclusively in aquatic ... Some, however, omit either the polyp or the medusa stage. .... polyp and medusa forms, or of zooids within colonial organisms like those in Hydrozoa. ..... organism, and they are now firmly identified as heavily derived cnidarians, ...

www.answers.com/Q/Identify_the_organisms_that_exist_as_either_a_medusa_or_polyp_form

Identify the organisms that exist as either a medusa or polyp form? Identify the ... Which phylum of animals alternates between a polyp and medusa body form?

www.encyclopedia.com/plants-and-animals/animals/zoology-invertebrates/polyp-and-medusa

polyp and medusa, names for the two body forms, one nonmotile and one typically ... In such organisms the polyp, by budding, gives rise to medusae, which either ... the polyp exists, as in the hydra and the sea anemone, the organism has the ...

www.shmoop.com/animal-evolution-diversity/polyps-medusas.html

... two basic body styles that are defined by our symmetry, either radial or bilateral . ... Eumetazoa have simple muscles and nerves that enable animals to move. ... Many cnidarians alternate between polyp and medusa forms during their life. ... like a medusa, but is actually bunch of polyps, so integrated that they can't exist ...

teara.govt.nz/en/diagram/4721/polyp-and-medusa-body-shapes

Jun 12, 2006 ... Corals, sea anemones and jellyfish belong to a group of animals called ... There are two basic cnidarian body shapes: a polyp form, which is ...

bioweb.uwlax.edu/bio203/s2007/shull_step/lifecyclerepro.htm

The scyphistoma becomes a strobila which is the mature polyp form. ... resulting in production of either more polyps or formation of ephyra which are simply small medusa. ... may occur is budding in which a new organism grows out from the body of the parent organism. ... In some Aurelia aurita, the polyp stage does not exist.

www.thoughtco.com/life-cycle-of-a-jellyfish-4112280

Digital illustration of life cycle of Jellyfish showing Medusa mobile phase, ... other animals, jellyfish reproduce sexually, meaning that adult jellyfish are either ... At the base of the polyp is a disc that adheres to the substrate, and at its top ... A jellyfish in medusa form. ... Can You Identify These 30 Different Invertebrate Groups?