The polyp (hydra) body plan is different from medusa and colonial because it’s sessile, which means it remains in one place their entire life. Class Hydrozoa. Phylum Cnidaria, which include about 9000 species is also commonly called Coelenterata. Now these eggs develop and thrive as polyp and reproduce asexually as polyp in favorable climate. A polyp is fixed and cylindrical structure which represents the asexual stage and Medusae is a free moving, umbrella-like structure which represents the sexual stage. Many other members of the class Hydrozoa, however, change from a polyp … These forms are dependent upon nutritional content of the living environment. The polyp produces buds in a regular and orderly manner and the result is a moss-like colony of Obelia bearing the two kinds of hydroid zooids: hydranths and blastostyles. Medusa is the adult and sexual form whereas Polyp is juvenile and asexual form. Under harsh living conditions and starvation, hydra reproduces sexually. Obelia’s sexual stage is medusa. Medusa. Also, the dominant phase of the life cycle of Obelia is the polyp. 2. The latter reproduce sexually giving rise to new polyps. In the phylum Cnidaria, which includes jellyfish and sea anemones, polyp and medusa are two different stages of the life cycle. The polyp is a sessile, or nonmotile, organism; well-known solitary polyps are the sea anemone and the freshwater hydra. Hydra) are single; others (e.g. • Hydra live in freshwater habitats, whereas Obelia is exclusively marine. Hydrozoa: More on Morphology: Most hydrozoans show the same alternation between polyp and medusa phases that the Scyphozoa, or "true" jellyfish, have.A fertilized egg develops into a sessile polyp, which buds asexually and eventually buds off one or more medusae.The medusa produce eggs and sperm, reproduce sexually, and thus the cycle is repeated. Some have no polyp stages and some (e.g. • Hydra does not have medusa form in their life cycle, whereas Obelia has both forms; polyp and medusa. Dwonload will not open, but if its a cylinder shape then it is in its polyp stage, if unbrella like then medusa. Examine the live specimens of Hydra fuscus (brown hydra) and Hydra viridens (green hydra has symbiotic algae). The medusa, when free swimming, is popularly known as a jellyfish. Most questions answered within 4 hours. The hydra can exist in its adult and sexual form which is... Our experts can answer your tough homework and study questions. Services, Working Scholars® Bringing Tuition-Free College to the Community. They have a simple body consisting of a central gut cavity surrounded by tentacles. the corals and Obelia) form colonies. A jelly-like substance called mesoglea lies between the outer and inner layers of the body. Corals, sea anemones and jellyfish belong to a group of animals called cnidarians. Eumetazoans have tissues that develop from the germ layers of the embryo, and there are two basic body styles that are defined by our symmetry, either radial or bilateral. Corals, sea anemones and jellyfish belong to a group of animals called cnidarians. All other trademarks and copyrights are the property of their respective owners. They develop into medusa again when food sources are scarce and temperature in unfavorable for asexual reproduction. - examples of cnidarians exhibiting the polyp body form include freshwater hydra, as well as anemones, corals, and others - in many species, the polyps live in interconnected colonies (e.g., see discussion of stony coral structure below) the medusa body form - this … Polyp and medusa body shapes Next. • Unlike Obelia, Hydra has great regenerative powers. So it catches food from prey that swim past them. A link to the app was sent to your phone. Polyp and medusa body shapes Next. Jellyfish, on the other hand, exhibit only the medusa stage, while members of the genus Hydra exhibit the polyp form. No packages or subscriptions, pay only for the time you need. Polyp. Medusa and polyp are the two body forms of cnidarians that alter through generations. • Hydra does not have medusa form in their life cycle, whereas Obelia has both forms; polyp and medusa. Obelia is a form of hydrozoans that have branched stalks. Sciences, Culinary Arts and Personal Two distinct body plans are found in Cnidarians: the polyp or tuliplike “stalk” form and the medusa or “bell” form. Hauptunterschied - Polyp gegen Medusa. (CC BY-SA 3.0) Some species of hydra can produce both ovary and testis. Other creatures start life as fee-swimming medusa, then settle and become polyps. However, Hydra is not typical of the Hydrozoa as a whole. Hydra (genus) remains a polyp at all stages, but other hydrozoa do show both polyp and medusa stages in their life cycles. Class Hydrozoa. 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