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en.wikipedia.org/wiki/Hydra_(genus)

Hydra /ˈhaɪdrə/ is a genus of small, fresh-water animals of the phylum Cnidaria and class ... When a hydra is well fed, a new bud can form every two days. ... of the Hydrozoa go through a body change from a polyp to an adult form called a medusa. ... Some species of Hydra exist in a mutual relationship with various types of ...

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. .... the polyp and medusa forms, or of zooids within colonial organisms like those in ..... for 67 deaths, although it is difficult to identify the animal as it is almost transparent.

shapeoflife.org/sites/default/files/global/PolypandtheMedusa.pdf

Cnidarians are also the first animals with an actual body of definite form and shape. .... Muscles and nerves exist in their most primitive forms in cnidarians. ... Imagine that you are a carnivore and spend most of your time either anchored to a ...

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.mesa.edu.au/cnidaria/default.asp

Sea anemones and corals have the polyp form, while jellyfish are typical ... small (or thin) organisms (ones which have a large surface area compared to their ... These individuals (called zooids) can either be directly connected by tissues ... reproduction often involves a complex life cycle with both polyp and medusa stages.

www.aquarium-design.com/invert/cnidarian.html

All Cnidarians (anemone like organisms) share a similar body plan. ... of Cnidarians exists as either a polyp or medusa that help taxonomists identify them . ... They may occur as microscopic attached forms, or be fifty feet long and live in the ...

www.oceaninn.com/en-us/wildlife/cnidarians.htm

In the Medusoid form, the organism is essentially upside-down, with the mouth ... They live either as solitary polyps, such as sea anemones, or in colonies of polyps ... sessile polyp phase and a free-swimming medusa stage, though the medusa stage ... They exist only in the polyp stage and obtain their food by filter feeding.

www.earthlife.net/inverts/cnidaria.html

4)Two different forms exist, medusa and polyp ... The Cnidaria (pronounced nidaria)as a group of animals are well known to many people under ... The Cnidocyst has either a modified flagellum called a Cnidocil, or a cone as a sensory trigger.

www2.hendrix.edu/biology/dearolf/Zoology%20Manual%20chap3&4%20-%20Secured.pdf

develop a mouth, hypostome and tentacles, then drop off and form ... Gonionemus is structurally like the Obelia medusa, except that the broken ... asexual polyps and sexual medusae--some may have either .... Intriguing possibilities would exist if we could acquire that .... Be able to identify the organism and know it is.

www.glencoe.com/sec/science/ose/bdol2005/ca/docs/chap26.pdf

You will identify and compare and contrast ... Sponges are asymmetrical aquatic animals that have a variety of colors, shapes, and ..... Polyp form has a tube- shaped body with a mouth surrounded .... either the polyp or medusa stage. Polyps ...