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Difference between Polyp and Medusa Polyp and medusa are two different life cycle stages of many species of the phylum Cnidaria. The phylum Cnidaria includes species existing only in the polyp stage (Anthozoa), species existing in the medusa stage, and species with both life cycle stages (Hydrozoa). Corals, sea anemones, jellyfish, and hydroids are cnidarians. Jan 24, · The key difference between Cnidaria and Ctenophora is that the cnidaria show alteration of generation between medusa and polyp, while Ctenophora does not show alteration of generation; only medusa form is present.. Phylum Coelenterata is a subdivision of Kingdom Animalia. It consists of two main phyla Cnidaria and Ctenophora and approximately species included.
Jellyfish reproduction involves several different stages. In the adult, or medusa, stage of a jellyfish, they can reproduce sexually by releasing sperm and eggs into difffrence water, forming a planula. In this larval stage of jellyfish life, the planula hooks on to the bottom of a smooth rock or other structure and grows into another stage of jellyfish life, the polyp--which resembles a miniature sea anemone.
During this stage, which can last for several months or years, asexual reproduction occurs. The polyps clone themselves and bud, or strobilate, into another stage of jellyfish life, called ephyra. 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. When what makes a salesman successful, these cells eject poison-tipped barbs that help the jellyfish catch food in the ocean.
The nematocysts can still release their sting even after the jellyfish is dead. In most jellyfish, anc stinging cells are so small that they can't penetrate human skin. Unfortunately, some are large enough to give a good sting if touched or stepped on by unsuspecting feet! The sting is usually no more harmful what is the difference between polyp and medusa an insect bite, but reaction to the toxin can vary greatly.
Stings from the box jellyfish or Portuguese man-of-war can result in severe pain and, in some rare cases, even death. If you are stung, splash the area with water; don't rub; you could actually make it worse by triggering more stinging cells. Pouring something acidic on the wound will help take the sting out; vinegar, some soft drinks like Pepsi or Cokered wine or even urine will work. Swelling and lingering pain may reflect an allergic reaction and warrant thhe visit to a physician.
Jellyfish come in a variety of shapes, sizes and colors. Although most of us believe that all jellyfish are clear blobs in the water or washed up on the beach, that is far from true. Reds, browns, yellows, mauve and even several shades of blue are common in many of the large jellyfish. Many other jellyfish are clear, making it easy to see their four stomachs at work.
The water in which they live can give jellyfish coloring, as can their own unique type of farming. Some jellyfish like the upside-down jellyfish, Cassiopeia xamachana are vegetarians that grow their own food and carry it with them.
These jellyfish raise algae inside their belly, giving them a food source that they take along as they float through the how to play ca lottery daily derby. The algae can range in color, giving the jellyfish a variety of shades.
Others still are influenced in color by their diet. For instance, moon jellies, when feeding on a differencce of larval crustaceans that are high in certain pigments, are usually pink to purple in color.
And here at the Aquarium of the Americas, we often use brine shrimp as jellyfish food. After the jellyfish eat, the orange-colored brine shrimp can be clearly seen inside the jellyfishes' four stomachs.
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What are Sponges?
Apr 19, · One interesting difference between sponges and cnidarians is that sponges lack tissue while cnidarians have tissues but not the organ systems. and Invertebrates Difference Between Sexual and Asexual Reproduction Difference Between Cnidaria and Ctenophora Difference Between Medusa and Polyp. Oct 03, · What are the Similarities Between Cnidaria and Ctenophora – Outline of Common Features 4. What is the Difference Between Cnidaria and Ctenophora – Comparison of Key Differences. Key Terms: Biradial Symmetry, Ceolentrates, Cnidaria, Ctenophora, Diploblastic, Medusa, Mesoglia, Polyp, Radial Symmetry, Statocyte, Tentacles. Jellyfish reproduction involves several different stages. In the adult, or medusa, stage of a jellyfish, they can reproduce sexually by releasing sperm and eggs into the water, forming a planula.
One interesting difference between sponges and cnidarians is that sponges lack tissue while cnidarians have tissues but not the organ systems. Sponges and Cnidarians are very primitive acoelomic invertebrates with very simple body structures. Both organisms are found in aquatic ecosystems. Sponges and Cnidarians have no organ systems. In this article, we will see the specific features of sponges and cnidarians and, from that, we will deduce the differences between sponges and cnidarians.
Sponges are aquatic animals with a simple hollow asymmetrical body and categorized under Phylum Porifera. Phylum Porifera includes about identified species. Some examples for sponges include barrel sponges, boring sponges, basket sponges, bath sponges, etc. Most species are marine and very few live in freshwater. Adults are sessile and have an asymmetrical bodies.
Sponge body is composed of two layers; outer flattened cell layer and inner flagellated collar cell line, which opens to its internal cavity. In between these two cell layers, there is a gel-like extracellular matrix. In most sponges, this matrix secretes fibrous protein that acts like an exoskeleton. Unlike other animals, sponges have intracellular digestion. Sponges feed on planktons by filtering water. Sponges are hermaphrodites. Their sperms are released into the water and eggs are stored in their body.
The larva is free-living and motile. Sponges are harvested from the sea by humans and used for bathing and cleaning. Cnidarians Phylum Cnidaria include jellyfish , sea anemones, corals , Hydra , and sea fans. There are about 10, species found in this phylum. The key characteristic features of cnidarians include radial symmetry , acoelomate body with tissues, lack of organs, and the simple digestive sac that opens through a mouth, which is surrounded by tentacles armed with nematocysts.
All cnidarians are carnivores and have very simple body structures adapted as predators. Most of them live in marine ecosystems, and very few species live in freshwater. Cnidarians have no reproductive, digestive, circulatory, or excretory systems. Moreover, they have a very primitive nerve net with nerve receptors, which are sensitive to touch, gravity and light. The only unique feature of cnidarians is the presence of nematocysts, a specialized cell for capturing their prey and for defense.
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