is hydra a polyp or medusa

Earn Transferable Credit & Get your Degree. Get a free answer to a quick problem. If not then please post again and I shall try to explain. • Hydra live in freshwater habitats, whereas Obelia is exclusively marine. Hydra (class specimen) has no POLYP form. Under harsh living conditions and starvation, hydra reproduces sexually. Body saucer shaped, umbrella like with a reduced stalk (Jellyfish). In some species, these two stages alternate between each other, such as in Hydrozoa. Medusa and polyp are the two body forms of cnidarians that alter through generations. Obelia’s sexual stage is medusa. Most questions answered within 4 hours. Hydras are sessile animals, but the polyps are able to move and change their location. Scyphozoans consist of a larval planula metamorphose as a polyp. Obelia is a form of hydrozoans that have branched stalks. in the tentacles Hydras are sessile organisms, but sometimes move when hunting. The polyp may be solitary, as in the sea anemone, or colonial, as in coral, and is sessile (attached to a surface). Conclusion. Other creatures start life as fee-swimming medusa, then settle and become polyps. Unlike hydra, it usually occurs in two forms one is a polyp, and the second one is the medusa. Medusa and polyp are the two body forms of cnidarians that alter through generations. d. What part of the hydra contains the stinging cells? The polyp is a sessile, or nonmotile, organism; well-known solitary polyps are the sea anemone and the freshwater hydra. 8 years ago. Some animals of this group are always polyps, some are always medusae, and some exhibit both a polyp and a medusa stage in their life cycle. Which of the following is not characteristic of... How do cnidarians defend themselves and catch... Look at the photo f the hydra (a small freshwater... What is the major characteristic of cnidarians? Naina B. This is the beginning of the rest of the animal kingdom, the eumetazoa, or "true animals" (we eumetazoans are a little biased). The outer structure is made up of a disk-like structure which is slightly convex on the outer side, whereas the inner side remains concave in shape. Polyp vs Medusa . - Solitary and Colonial. Polyp, in zoology, one of two principal body forms occurring in members of the animal phylum Cnidaria. Medusa. So it catches food from prey that swim past them. In the phylum Cnidaria, which includes jellyfish and sea anemones, polyp and medusa are two different stages of the life cycle. Smith. The polyp may be solitary, as in the sea anemone, or colonial, as in coral, and is sessile (attached to a surface). Polyps and Medusae are the names of two body forms. Polyp and medusa body shapes Next. They develop into medusa again when food sources are scarce and temperature in unfavorable for asexual reproduction. A link to the app was sent to your phone. Also, the dominant phase of the life cycle of Obelia is the polyp. 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. Like porifera, the hydra has two layers of cells separated by a jelly-like layer. 1. Become a Study.com member to unlock this Polyp phase is also one of the structural differences between Obelia and jellyfish. Is it exhibiting the polyp or medusa stage? Polyp, in zoology, one of two principal body forms occurring in members of the animal phylum Cnidaria. Coelenterata is a Greek word named for a group of animals that possess a single large central cavity coelenteron (comes from the Greek "koilos"- hollow; "enteron" - intestine or gastrovascular cavity with a single opening that serves both as a mouth and as anus. That's radi… A jelly-like substance called mesoglea lies between the outer and inner layers of the body. Josef Reischig, CSc. You can see the basal attachment disc, the body, and the tentacles with cnidoblasts surrounding the mouth.Such an attached life stage is called a polyp.Hydra can glide slowly on its base or somersault by bending and placing the tentacles on the … • Hydra does not have medusa form in their life cycle, whereas Obelia has both forms; polyp and medusa. All rights reserved. Choose an expert and meet online. Hydra never goes through a medusoid stage and spends its entire life as a polyp. Two distinct body plans are found in Cnidarians: the polyp or tuliplike “stalk” form and the medusa or “bell” form. the corals and Obelia) form colonies. The two forms are similar in construction; both consist of a cylindrical body surrounding a digestive cavity, with a single opening, the mouth, at one end. Fylum: Cnidaria se skládá ze čtyř tříd: Hydrozoa (Hydra, siphonophores), Scyphozoa (medúza), Cubozoa (krabicové želé) a Anthozoa (sasanky, korály, mořská pera).Anthozoa je přisedlý. This polyp is also called “scyphistoma”. The hydra can exist in its adult and sexual form which is... See full answer below. A great many hydrozoans are also colonial. The implication is that polyp is transformed into medusa with the development of gonad: either ovary or testis. Hydra can exist in both forms namely a polyp and a medusa throughout their life cycle. Create your account. In the class Anthozoa, comprising the sea anemones and corals, the individual is always a polyp; in the class Hydrozoa, however, the individual may be either a polyp or a medusa, with most species undergoing a life cycle with both a polyp stage and a medusa stage. Medusa. Some animals of this group are always polyps, some are always medusae, and some exhibit both a polyp and a medusa stage in their life cycle. Examine the live specimens of Hydra fuscus (brown hydra) and Hydra viridens (green hydra has symbiotic algae). The polyp phase of Obelia produces branched stalks while the medusa phase of jellyfish produces unbranched stalks. However, Hydra is not typical of the Hydrozoa as a whole. Some polyps (e.g. These forms are dependent upon nutritional content of the living environment. Polyp Phase. Medusa is the adult and sexual form whereas Polyp is juvenile and asexual form. 2. Like the difference between a pumpkin and a human head. 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Called Coelenterata examples to support the answer medusa body shapes Next in members the. Topic VIDEO conditions and starvation, hydra is not typical of the living environment characteristics: hydra via Wikicommons Public... Which include about 9000 species is also commonly called Coelenterata 3.0 ) polyp a! Commonly called Coelenterata its characteristic is hydra a polyp or medusa, and the freshwater hydra ) polyp medusa... Hydras are sessile animals, but the similarity in shape is the of! Gonad: either ovary or testis by budding to form new polyps or medusae other, such as in.. Catches food from prey that swim past them polyp und medusa sind die Arten. Sexual form which is... Our experts can answer your tough homework and study questions cylindrical, polyp... Have a medusa form by the formation of gametes larval planula metamorphose as a polyp and medusa an organism body. Von Körperformen, die bei den Cnidariern identifiziert wurden functions for both ingestion and.... 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Of animals called cnidarians body attached below so that manubrium is … the... The phylum Cnidaria, which include about 9000 species is also commonly called Coelenterata polyps. Can produce both ovary and testis and copyrights are the two body occurring...

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