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What most freshwater hydrozoa exist only as what?
Most freshwater hydrozoa exist only as the polyp form. They never switch to the medusa form, or sexual form. This means they exist only in the asexual form.
How do hydras differ from other cnidarians the class Hydrozoa?
Most hydras alternate between an asexual polyp stage and a sexual medusa stage, though the best-known Hydrozoan, Hydra, never becomes a medusa, spending its whole life as a polyp.
Which animals belong to the class hydrozoa?
Animals in the class Hydrozoa include various species of hydroids, hydras, and Portuguese man o' war. They are mostly marine invertebrates that display a wide range of forms and lifestyles, often existing as colonial organisms with polyps and medusae.
What is the dispersive stage of sponges?
medusa, the polyp is the sessile stage
Who was Medusa married to?
Medusa wasn't married, but she was Poseidon's girlfriend at one stage.
Who Medusa married to?
Medusa wasn't married, but she was Poseidon's girlfriend at one stage.
What is name of class of jellyfish?
The four major classes of medusozoan Cnidaria are:Scyphozoa are often called true jellyfish. They have tetra-radial symmetry. They have tentacles around the outer margin of the bowl-shaped bell, and oral arms around the mouth.Cubozoa (box jellyfish) have a box-shaped bell, and their velarium assists them to swim more quickly. Box jellyfish may be related more closely to "true jellyfish" than either are to hydrozoa.[35]Hydrozoa may form medusa which resemble scyphozoans (but generally with a velum) and are distinguished by an absence of cells in the mesoglea. However, many hydrozoa species do not form medusa at all (such as hydra, which is hence not considered a jellyfish).Staurozoa (stalked jellyfish) do not have a polyp stage, however the medusa is generally sessile, oriented upside down and with a stalk from the "bell" planted to the substrate. Until recently, staurozoa was classified within scyphozoa.
Does the freshwater hydra have a medusa stage in its life cycle?
no
What Organisms which typically exhibit a polyp stage and a medusa stage belong to which class of Cnidarians?
Obelia
Is hydra a polyp or a Medusa?
polyp! The star coral is attached and is faceup
How will you distinguish between hydrozoan polyp and scyphozoan polyp?
The difference between most hydrozoans and most scyphozoans is that in hydrozoans, the polyp stage usually predominates, with the medusa small or sometimes absent.Often, the medusa never breaks away from the parent polyp, and remains in a state of arrested development, although its gametes function. Such a medusa is referred to as a sporosarc.In scyphozoans, the medusa stage is typically large and free-living, with the polyp stage small.However, there are exceptions - certain hydrozoans known as the Trachylina never form a polyp stage. Free-living medusoid hydrozoans can be hard to tell from scyphozoans, but hydrozoan medusae generally have a muscular shelf, or velum, projecting inward from the margin of the bell.This structure is not found in scyphozoans. Hydrozoans also lack cells in the mesoglea, the jelly layer found between the basic cell layers, whereas scyphozoans contain amoeboid cells in the mesoglea.Another feature that is quite common in Hydrozoa but not typical of Scyphozoa is colonial organization.
Are marine hydrozoa more complex than fresh water hydrozoa?
eight
