what is the structural differences between obelia and jelly fish?
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Obelia refers to a genus of sedentary colonial coelenterates with upright branching stems bearing minute cups in which the polyps sit while jellyfish refers to a free-swimming marine coelenterate with a gelatinous bell- or saucer-shaped body that is typically transparent and has stinging tentacles around the edge.
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Whilst the common goldfish has 'stiff' fins, the Comet has long flowing ones; it is also smaller than 'regular' goldfish. However the main way to differentiate between the two is the Comet's long heavily forked tail; they have a slim body and only have a tail fin and a single anal fin.
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['Unsegmented soft body with bilateral symmetry.', 'Presence of an internal or external shell.', 'A toothed tongue (made mostly of chitin) called the radula.', 'A mantle which is a fold in the body wall that lines the shell.', 'Muscular foot (and/or tentacles in some).']
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In the adult, or medusa, stage of a jellyfish, they can reproduce sexually by releasing sperm and eggs into the water, forming a planula. ... It is this form that grows into the adult medusa jellyfish. The jellyfish sting actually comes from tiny nematocysts, or stinging cells, on the jellyfish body.
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But despite their name, jellyfish aren't actually fish—they're invertebrates, or animals with no backbones.
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That's because “jelly ball” is a nickname for a type of jellyfish — the cannonball. It's about as wide as a small pizza, and shaped like a mushroom. ... Since jellyfish are mostly water, they're dehydrated with salt and other compounds before they're shipped abroad.
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One of the Jellyfishes Niches is to feed on plankton, algae, and sometimes fish. This keeps the prey population in check and stops a complete shift of predator:prey ratio.
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['They have a star-like appearance and are spherical or elongated.', 'They are exclusively marine animals.', 'The organisms are spiny-skinned.', 'They exhibit organ level of organization.', 'They are triploblastic and have a coelomic cavity.', 'The skeleton is made up of calcium carbonate.']
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Irukandji jellyfish are very small, with a bell about 5 millimetres (0.20 in) to 25 millimetres (0.98 in) wide (or wider) and four long tentacles, which range in length from just a few centimetres up to 1 metre (3.3 ft) in length.
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Those gelatinous, undulating creatures we call jellyfish all produce at least some toxin, but not every species is dangerous to humans. There are a couple thousand varieties worldwide, from small sea nettles to large moon jellies, and the severity of their stings varies. A handful are deadly.
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They're related to other jellyfish, of course, but they also have more distant cousins that are different kinds of animals, in the same way humans are related to apes. ... But often, people will guess that jellyfish are related to cephalopods—octopuses or squids—since they all have tentacles.
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Jellyfish eat many different types of things, such as small plants (phytoplankton), copepods (crustacean zooplankton), fish eggs and other small fish called larvae; they also eat the planktonic eggs and young stages (also called larvae) of many different kinds of marine animals. Some jellyfish even eat other jellyfish!
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Under a microscope they look like an oval with fuzzy, leg-like cilia surrounding it. Zoom in further and you can see their nematocysts or stinging cells. The thimble jellyfish is endowed with powerful nematocysts because a little, jelly-like animal that doesn't sting is just that–a little, jelly-like animal.
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These include, sea nettles, moon jellies and jellyfish. The jellyfish found in this class are dubbed "the true jellyfish". ... Yes, they have sac shaped bodies and long tentacles that sting painfully, but they are still structured differently than those organisms of Class Scyphozoa.
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Hydra is a solitary species and lives attached to substrates, whereas Obelia is a colonial species and lives as polyps in an interconnected branching network. Hydra live in freshwater habitats, whereas Obelia is exclusively marine.
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The beautiful Japanese swallowtail angelfish is one of the few truly reef tank safe angelfish as it does not bother corals or other invertebrates. The swallowtail angelfish is a mid-water column fish, meaning that in the wild it does not live on the reef nor near the surface.
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Obelia and jellyfish are two classes of the phylum Cnidaria. Their life cycle alters between polyp and medusa stages. Here, their medusa phase is free-swimming while the polyp phase is sessile. Furthermore, the medusa phase is the sexual phase while the polyp phase is the asexual phase.