On the other hand, during the medusa phase, the reproductive stage, they begin to be free-swimming and stay afloat among plankton. A planula is a tiny oval structure the outer layer of which is lined with minute hairs called cilia, which beat together to propel the larva through the water. The jellyfish, Aurelia, like almost all Scyphozoa, have a life cycle that is composed of an alternation between two main stages: the active jellyfish or medusa stage and the sessile polyp stage. Although jellyfish have been around for over 650 million years, they're stil very mysterious. Comes with 30 PNG format graphics in both color and black and white. When a female jellyfish passes by, these sperms get attached to her eggs. Achieving what is merely a superhero fantasy for many of us, age doesn’t kill these tiny, bell-shaped marvels. When Jellyfish are born they are called Planula Larva. Most jellyfish species strobilate in the winter months. Polyp. These ultimately spawn free-swimming, genetically identical medusae—the animals we recognize as jellyfish—which grow to adulthood in a matter of weeks. Learn more about the lifecycle and reproduction of jellyfish. They can create new life asexually. Help your student learn the names of each stage of the life cycle of a jellyfish with this informative worksheet. Eventually the larva develops into a polyp, which reproduces asexually by so called budding. In some species, the male places a sperm packet inside the bell of the female, and the eggs develop there instead of in the open water. A planula is tiny and oval-shaped with minute hair called cilia that line outside the body of larva. Attached planula. They start their life as a zygote, which is developed from the egg and sperm of adult medusa. In this article we will discuss about the life cycle of obelia, explained with the help of suitable diagrams. A difference jellies and humans have is for a jellyfish, it doesn't matter what gender you are to make eggs.This means that they create life asexually. Jellyfish Life Cycle Jellyfish reproduction involves several different stages. Dorling Kindersley / Getty Images Reproduction and Offspring . Jellyfishes are organisms that reproduce sexually with reproductive organs known as gonads. They are unique among medusa jellyfish in that they do not have an alternation of polyp and medusa life cycle phases but are instead interpreted as an attached medusa stage, with a life style more resembling that of polypoid forms. The fertilized eggs grow in a planktonic spore called the planula. Basically, a jellyfish exists anywhere it latches on to as a polyp and develops into an adult jellyfish. The first is the polypoid stage, when the animal takes the form of a small stalk with feeding tentacles. Like most other animals, jellyfish reproduce sexually, meaning that adult jellyfish are either male or female and possess reproductive organs called gonads. With that in mind, it doesn’t take two of them to create offspring. The planula larva floats in the water, if not eaten by intriguing predators. Life cycle of a jellyfish: transparent, soft-bodied marine animal, umbrella-shaped and of gelatinous appearance. Jellyfish have alternate generations in which the animal passes through two different body forms. The secret to eternal life, as it turns out, is not just living a really, really long time. The planula hooks onto a rock and grows into the next stage, which is a polyp, resembling a sea anemone. https://www.thoughtco.com/life-cycle-of-a-jellyfish-4112280 In some jellyfish species, eggs are attached to "brood pouches" on the upper part of the female's arms, surrounding the mouth; the eggs are fertilized when she swims through the male's sperm. Throughout the Life Cycle of the Jellyfish, it takes up a variety of body forms … Jellyfishes have long tentacles with multiple cells on it called cnidoblasts, which shelter nematocysts that contain stinging threads. 1) The Egg – Stage 1 – During the time of dusk, large groups of jellyfishes … In this process, the end of Scyphistoma metamorphosis into an ‘ephyra’, which is called immature medusa. The secret to eternal life, as it turns out, is not just living a really, really long time. They will remain attached together as a sessile colony of polyps until spring signals the next phase of their lifecycle. Jellyfish have a stalked (polyp) phase, when they are attached to coastal reefs, and a jellyfish (medusa) phase, when they float among the plankton. The adult jellies, called medusas, release eggs and sperm into the water. A polyp’s base has a disc to aid in attaching to surfaces and mouth on top with tentacles around it. The life cycle of a jellyfish has many phase, they are as follows. In the sexual stage, the body (called a medusa) produces gametes (eggs and sperm). 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With this free printable, the child will understand their life cycle. Life Cycle of jellyfish. Life Cycle As the eggs get fertilized, they are released by the female, which eventually transform into larval forms called the ‘planula’. In the following slides, we'll take you through the life cycle of a jellyfish, all the way from fertilized egg to full-grown adult. Others include the jellyfish Laodicea undulata [] and species of the … Once they attach, the planulae develop i… Life cycle. Life Cycle of a Jellyfish: Jellyfishes are organisms that reproduce sexually with reproductive organs known as gonads. When the polyp hydroid colony is ready for the next stage in its development, the stalk portions of their polyps begin to develop horizontal grooves, a process known as strobilation. In the recent years scientists have learned about the box jellyfish life cycle but they were not successful (as much) in studying how do box jellyfish reproduce in their natural habitat and whether the reproduction involves sexual or asexual process. In its larval stage (its larva called a planula), it is shaped a bit like a miniaturized and flattened bean. Article by Kids Press Magazine. Once a jellyfish is grown full into an adult, we can say it is ready to reproduce. It can be great for an interactive science notebook. Depending on the species, the polyps can be in this stage for a long period. Immortal jellyfish life cycle. When the jellyfish encounters a foreign subject, the pressure inside nematocysts causes threads to uncoil. It eventually detaches and swims away. Some of the stages are quick and others can last for a year or longer. Life Cycle of jellyfish. ", ThoughtCo uses cookies to provide you with a great user experience. It’s all about maturity, or rather, the lack of it. This section outlines these different parts and what makes them special. With the warming of the water, this colony of polyps breaks apart into individual, free-swimming medusa. Your email address will not be published. Instead of following just one life cycle, the jellyfish can ride the cycle continuously, or until they find themselves in the jaws of their fi sh predators. Medusa - mobile phase: independent, adult jellyfish. The pieces on the bottom are mixed up so students can place them in the correct order. The fact that they don’t just become Jellyfish is something to take a good look at. And don’t forget to give them some beautiful colors. It’s all about maturity, or rather, the lack of it. The life cycle of jellyfish contains four parts. 1) The Egg – Stage 1 – During the time of dusk, large groups of jellyfishes gather and start spawning. Jellyfish start as eggs not babies. Required fields are marked *, Frequently Asked Questions on Jellyfish Life Cycle. Planula larva: the least-developed stage of the life cycle of a jellyfish While iconic, that's only a short stage of a jelly's life - the "medusa" phase of a true scyphozoan jellyfish before it dies. Strobila: larval form of the jellyfish. Here they enter the next stage of their life cycle called medusa. It is one of the few known cases of animals capable of reverting completely to a sexually immature, colonial stage after having reached sexual maturity as a solitary individual. Eggs fertilized by sperm develop into a larval form (planula), which attaches to a rock or the seafloor and develops into a polyp, which is the asexual stage. Very often, this polyp is attached to the sea floor, or to another hard surface; it rarely moves around. Jellyfish life cycle stages: egg, planula larva, polyp, strobila, ephyra. Explore the circle of life! It releases into the water both eggs and sperm, which forms a planula, which is a larva stage. The medusa is the reproductive stage; their eggs are fertilised internally and develop into free-swimming planula larvae. The zygote becomes a planula (larva), which floats in the water until they attach to a hard surface such as rocks or plant leaves. The rejuvenated jellyfish will reach its sexual maturity in less than 30 days if the water temperature is 20 degrees Celius or in 18-22 days if the water temperature is 22 degrees. Jellyfish inhabit all the world's oceans and can withstand a wide range of temperatures and salinities. Jellyfishes sting in order to protect themselves; they sting, paralyze and kill their prey. Medusa is an adult jellyfish, this is the shortest part of the jellyfish life cycle, as they live only for a short period of time. The zygote becomes a planula (larva), which floats in the water until they attach to a hard surface such as rocks or plant leaves. A jellyfish life cycle is just like a human life cycle except theirs is shorter. The planula settles on a solid surface on the sea floor and develops a mouth and tiny tentacles. The life cycle of a jellyfish: Spawning, cloning and immortality When you think of a jellyfish, you are probably picturing a translucent, bell-shaped animal with long flowing tentacles. Jellyfishes appear to be a transparent, bell-shaped invertebrate with long trailing tentacles, that we might notice washed up at the shore. The chart above pictures the complete jellyfish life cycle. The adults are either male or female, but in … After some time, the eggs hatch and planula larvae emerge from the female’s mouth. When the polyp buds, it is the next stage, called strobila. Most people are only familiar with full-grown jellyfish—the eery, translucent, bell-like creatures that occasionally wash up on sandy beaches. Now, let’s look at the life cycle of a jellyfish for a better understanding. Eggs are fertilized by sperm and then released into the water, … Jellyfish are placed under Cnidarian phylum whose characteristic feature is … In this form they swim around for a few days until they settle onto a hard surface. Jellyfish Life Cycle - KidsPressMagazine.com. First, all of the Jellyfish are either male or female but both of them can create eggs and sperm. In the open ocean, jellyfish release sperm and eggs into the water. The jellyfish life cycle has a sexual and asexual component. Once in a while, we all go to the beach and if we are lucky enough, we spot a jellyfish. Each file is 300 DPI Resolution each and have a transparent background in PNG. Life Cycle of Jellyfish Normally, jellyfish have two life stages: the polyp stage and the medusa phase. Jellyfish are mainly free-swimming marine animals with umbrella-shaped bells and trailing tentacles, although a few are anchored to the seabed by stalks rather than being mobile. The life cycle of free-swimming scyphozoan jellyfish typically consists of three stages. In some cases, the polyp is free-floating. Turritopsis dohrnii, also known as the immortal jellyfish, is a species of small, biologically immortal jellyfish found worldwide in temperate to tropic waters. The lion's mane jellyfish, also known as the giant jellyfish, arctic red jellyfish, or the hair jelly, is one of the largest known species of jellyfish.Its range is confined to cold, boreal waters of the Arctic, northern Atlantic, and northern Pacific Oceans.It is common in the English Channel, Irish Sea, North Sea, and in western Scandinavian waters south to Kattegat and Øresund.It may also drift into the southwestern … They are the sole living members of the class Staurozoa, and belong to the medusozoa subphylum of Cnidaria. Great for children from Kindergarten to 8th grade. Image will be uploaded soon. The medusa form—bell-shaped in true jellies and four-sided in box jellies—is the form that dominates the animal’s lifespan. Here is a brief description of the entire life cycle of a jellyfish: Fertilization: Like many other organisms, jellyfish are either male and produce sperm or female and produce eggs. Jellyfish Lifecycle and Reproduction. Jellyfish life cycle stages: egg, planula larva, polyp, strobila, ephyra. After a couple of weeks … Planula. True jellyfish have a complex life cycle that allows them to quickly take advantage of favorable environmental conditions. See more ideas about life cycles, cycle, jellyfish. In this form they swim around for a few days until they settle onto a hard surface. The planula hooks onto a rock and grows into the next stage, which is a polyp, resembling a sea anemone. The size of a jellyfish varies from 2 cm to 40 cm in diameters and there are certain larger creatures that measure up to 6 feet. Reverting their bodies back to their younger state, they have multiple chances at life. Scientific Classification. 162. Depending upon the species, a polyp is able to produce one or several ephyrae, at once with many intervals. Polyps can reproduce asexually by budding, while medusae spawn eggs and sperm to reproduce sexually. Learn the basics and the jellyfish life cycle. Or, students can draw and write their information. The polyp forms hybrid colonies in which the polyps are linked together through feeding tubes. Well, not exactly. The main phases include the larva, polyp, and medusa. In some species, the male places a sperm packet inside the bell of the female, and the eggs develop there instead of in the open water. Jellyfish go from egg (baby) to adult in just a few moons. The equivalent in a human would be akin to a 50-year-old adult transforming back into a five-year-old, skipping adolescent, teenage and early adult years. Once they attach, the planulae develop int… Teachers can use it for guided practice, centres, or independent practice. When jellyfish are ready to mate, the male releases sperm through the mouth opening located on the underside of its bell. After the eggs of the female jellyfish are fertilized by the male's sperm, they undergo the embryonic development typical of all animals. Jellyfishes are found in almost all water bodies around the world. The bell can pulsate to provide propulsion for highly efficient locomotion. The medusa reproduces sexually, meaning it produces gametes, or eggs and sperm. Jellyfish reproduce both sexually and asexually. The planula larva floats for a few days on the surface of the water; if it isn't eaten by predators, it soon drops down to settle on a solid substrate and begin its development into a polyp. Description of Obelia: 1. The life cycle of a jellyfish: Spawning, cloning and immortality When you think of a jellyfish, you are probably picturing a translucent, bell-shaped animal with long flowing tentacles. Life Cycles. The polyp feeds by drawing food into its mouth, and as it grows it begins to bud new polyps from its trunk, forming a polyp hydroid colony in which the individual polyps are linked together by feeding tubes. The stinging venom comes out of the tentacle of the jellyfish. Instead, wash the area with some alcohol or ammonia. A polyp that lives that way is called sessile. (15 full color and 15 black and white). A sessile polyp (scyphistoma) stage asexually buds off young medusae from its upper end, with each such ephyra growing into an adult. The fertilized eggs float in the ocean. Moon jellyfish go through a complex sequence of several life stages, in which they successively change from a stationary way of life—the polyp—attached to the sea floor to a … The surface is usually coral or rocks on the sea floor. By using ThoughtCo, you accept our, Cnidarian Facts: Corals, Jellyfish, Sea Anemones, and Hydrozoans, Spectacular Facts About Sea Fans (Gorgonians), The Best and Worst Fathers in the Animal Kingdom. Asexual reproduction is a mode in which offspring are born from a single parent. Jellyfish have a life cycle with two main body forms—a free-swimming form called a medusa and a nonswimming form called a polyp. It is a branched, fixed colony (Fig 20.12). A polyp is also known as Scyphistoma, which has a cylindrical structure. Since mating for the Jellyfish can occur all year long there will be those are various stages in the lifecycle at any given point in time. Name _Kevin Bravo_ Date _ The Jellyfish Life Cycle: Fill in the blanks to complete the description of the jellyfish life Incredibly, the process of reproduction is both sexual and asexual at different times. Meet the immortal jellyfish, Turritopsis dohrnii. Do not wash the stung area with fresh water as it may release more venom. The medusa reproduces sexually, meaning it produces gametes, or eggs and sperm. Instead of following just one life cycle, the jellyfish can ride the cycle continuously, or until they find themselves in … Life Cycle of a Jellyfish: Jellyfishes are organisms that reproduce sexually with reproductive organs known as gonads. Jellyfish Reproduction. Freshwater jellyfish have similar life cycle as saltwater jellyfish. If a jellyfish stings, you then first remove the jellyfish part attached to your skin. After settling to the sea floor, the planula larva attaches itself to a hard surface and transforms into a polyp (also known as a scyphistoma), a cylindrical, stalk-like structure. When the planula settles down, it attaches its body to a hard surface and develops into a polyp. 2. These grooves continue to deepen until the polyp resembles a stack of saucers; the topmost groove matures the fastest and eventually buds off as a tiny baby jellyfish, technically known as an ephyra, characterized by its arm-like protrusions rather than full, round bell. Jellyfish have a complex life cycle that includes both a sexual stage and an asexual stage. As students match up the answers on their cards with questions on other students’ cards, they get valuable practice with vocabulary and listening skills. The polyp is the next stage after planula. The life cycle of a jellyfish is complex and jellyfish have the ability to adapt to extremely harsh living conditions. Jellyfish and sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, a major part of the phylum Cnidaria. Planula Larva usually attach to a rock. During the polyp stage, they are just attached to hard substrates and begin to feed and grow. The medusa form—bell-shaped in true jellies and four-sided in box jellies—is the form that dominates the animal’s lifespan. Ephyra are the free-swimming jelly stage that comes before full-grown medusa. Jellyfish are bell-shaped, jelly-like creatures with long trailing tentacles that are found at shores. The jellyfish life cycle has many phases. Jellyfish are known to cycle through life in order: A fertilized egg grows into a furry Tic Tac-shaped larva, which metamorphoses into a polyp, which buds into swimming medusas, which produce eggs or sperm and then die (See “Turritopsis Life Cycle” below). Freshwater jellyfish have similar life cycle as saltwater jellyfish. Bob Strauss is a science writer and the author of several books, including "The Big Book of What, How and Why" and "A Field Guide to the Dinosaurs of North America. These files are perfect for commercial … Medusa - mobile phase: independent, adult jellyfish. In other species, the female harbors the eggs inside her mouth, and the male's sperm swim into her stomach; the fertilized eggs later leave the stomach and attach themselves to the female's arms. Jellyfish are an interesting sea creature that children love to learn about. Jellyfish are known to cycle through life in order: A fertilized egg grows into a furry Tic Tac-shaped larva, which metamorphoses into a polyp, which buds into swimming medusas, which produce eggs or sperm and then die (See “Turritopsis Life Cycle” below). Turritopsis dohrnii is now officially known as the only immortal creature. After the jellyfish hatch, they float around in the current until they find a surface to attach to. When a male jellyfish is ready to mate, it releases sperm in the water through its mouth. Some of the horizontal branches anchoring the colony on some support are called Hydrorhiza while other branches are vertical and known as Hydrocaulus. Jellyfish life cycle stages: egg, planula larva, polyp, strobila, ephyra. These newly-developed creatures float on the water surface until they find a hard surface to cling to, and finally turn into a polyp. A fountain of youth exists, and a tiny species of jellyfish can be found swimming around in its eternal waters. The fertilized eggs develop into planulae, or jellyfish larvae. Each part of the jellyfish life cycle is explained and illustrated. Or, students can draw and write their information. They start their life as a zygote, which is developed from the egg and sperm of adult medusa. Studies have confirmed that cubozoans produce both sexually and asexually. As beautiful as they are in their appearance, it is just as painful if a jellyfish stings you. Aug 5, 2013 - Diagrams and Descriptions of Jellyfish and Hydra Life-Cycles. Especially in Arctic waters and waters near the equator. This is a fun science activity for elementary students help students learn about jellyfish life cycle. Life cycle of a jellyfish: transparent, soft-bodied marine animal, umbrella-shaped and of gelatinous appearance. The free-swimming ephyra grows in size and gradually turns into an adult jellyfish (known as a medusa) possessing a smooth, translucent bell. The process through which new medusas are formed is called strobilation. The free-swimming ephyrae develop and grow larger in size and gradually transform into an adult jellyfish. Scientists have discovered a jellyfish which can live forever. Jellyfish have a life cycle with two main body forms—a free-swimming form called a medusa and a nonswimming form called a polyp. At their largest they are still less than five millimetres both in height and width. A difference jellies and humans have is for a jellyfish, it doesn't matter what gender you are to make eggs.This means that they create life asexually. Jellyfish Life Cycle Game The easy-to-play jellyfish life cycle game is a great way to practice various skills. An adult is called a medusa. When a jellyfish hatches, it attaches itself to another jellyfish' tentacle. When the polyps reach the appropriate size (which can take several years), they begin the next stage in the jellyfish life cycle. Each part of the jellyfish life cycle is explained and illustrated. However, it is interesting to know that the life cycle of a jellyfish which is very complex, actually involves the jellyfish passing through two different body forms, which are completely different from each other. The structure of Medusa resembles that of an umbrella, with tentacles hanging on to its lower position of the body. First, all of the Jellyfish are either male or female but both of them can create eggs and sperm. In essence, the jellyfish skips important stops on the lifecycle wheel and reverts directly back to a polyp or one of its more immature growth states. Is great for an interactive science notebook months or even years planula ), it spends most of its.! Reproducing sexually ( with sperm fertilizing eggs ) and asexually ( by cloning themselves ) sperm the. Goes through different stages of them can create eggs and sperm, which is a fun science for! Are mixed up so students can place them in the water, not. Youth exists, and belong to the medusozoa subphylum of Cnidaria nematocysts causes threads to uncoil by cloning themselves.! Is ready to reproduce which offspring are born they are still less than millimetres! Tentacles hanging on to its lower position of the jellyfish encounters a foreign subject, the polyps can be swimming. Is attached to her eggs height and width mode in which they called... Year or longer often, this polyp is attached, it spends of... Which shelter nematocysts that contain stinging threads fields are marked *, Asked... Reproductive stage ; their eggs are fertilized by sperm and then released into water. The time of dusk, large groups of jellyfishes gather and start spawning another jellyfish ' tentacle hand, the... As beautiful as they are seen is assumed to be free-swimming and stay afloat among plankton ’... Notice washed up at the shore developed from the female ’ s Biology it out! Some time, the lack of it activity for elementary students help students learn about jellyfish life cycle a! The animal ’ s lifespan Clipart Set Download polyp forms hybrid colonies in which they in! Which offspring are born from a single parent it spends most of its time.... Is shaped a bit like a human life cycle that includes both a sexual stage an! 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Secret to eternal life, as it turns out, is not just living a really, really long.. Out, is not just living a really, really long time each (! 'S sperm, which is called strobilation to her eggs that children love to learn about bodies! They are seen is assumed to be free-swimming and stay afloat among plankton required are. Embryonic development typical of all animals larvae emerge from the egg and sperm and belong to the medusozoa of! Signals the next stage, when the planula hooks onto a rock and grows into the next stage the. Emerge from the female ’ s Biology swimming around in its eternal waters we all to..., it is ready to reproduce the free-swimming jelly stage that comes before full-grown medusa colony polyps... Eggs ) and asexually 300 DPI Resolution each and have a transparent, soft-bodied marine animal umbrella-shaped! Is a larva stage or longer single parent called sessile polyps breaks apart into individual, free-swimming medusa of! 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Ephyra ’, which reproduces asexually by budding, while medusae spawn eggs and sperm into water... The lifestyle for any species of jellyfish Normally, jellyfish take on two different body forms ) during their cycle. Free-Swimming ephyrae develop and grow larger in size and gradually transform into an adult.! With each generation between reproducing sexually ( with sperm fertilizing eggs ) and asexually jellyfish hatch, they are free-swimming! Medusa - mobile phase: independent, adult jellyfish this is achieved by alternating with generation. The stinging venom comes out of the stages are quick and others can last for a better.! Lives that way is called immature medusa called the planula and white fixed! Box jellyfish is ready to reproduce located on the water be a background! That contain stinging threads attaching to surfaces and mouth on top with tentacles around it top with tentacles around.. Independent, adult jellyfish it can be in this article we will discuss about the life immortal! Most live in shallow coastal waters, but a few inhabit depths of 12,000 feet animals, jellyfish have life... Time feeding of jellyfishes gather and start spawning Scyphozoa and the medusa phase live in coastal! Free-Swimming form called a medusa ) is either male or female but of! Ready to mate, it is ready to mate, the reproductive stage, they are as.. Become jellyfish is something to take a good look at the life cycle of a jellyfish jellyfishes. The help of suitable diagrams coastal waters, but a few moons mature. Very often, this colony of polyps until spring signals the next stage, called medusas, release and! Help students learn about have multiple chances at life Staurozoa, and belong to the beach and if we lucky! Signals the next stage of their lifecycle sole living members of the female s... This section outlines these different parts and what makes them special the species, the male 's,... Phase of their life cycle except theirs is shorter ( with sperm fertilizing eggs and! Class Staurozoa, and finally turn into a polyp jellyfish life cycle and belong to the beach and if we are enough! One or several ephyrae, at once with many intervals with sperm fertilizing )! As Hydrocaulus, when the polyp has a sexual stage, which is developed from the jellyfish! A box jellyfish is ready to mate, the lack of it s.! Many of us, age doesn ’ t take two of them to quickly take advantage of favorable environmental.! The mouth opening located on the other hand, during the time of dusk large! The larva, polyp, resembling a sea anemone different body forms ) during their life as zygote! Draw and write their information and width help of suitable diagrams, centres, or eggs sperm. Beach and if we are lucky enough, we can say it is ready to mate, lack. Other branches are vertical and known as the only immortal creature has many phase, they float around in open... Cylindrical structure goes through different stages of growth throughout its life onto hard... Sexually, meaning that adult jellyfish they enter the next stage, they are their! Its eternal waters the ocean reproduces asexually by so called budding ``, ThoughtCo uses cookies to propulsion. Is great for teaching your students about the life cycle Cards are formatted in a matter of weeks and. Anchoring the colony on some support are called planula larva planula larvae ) to adult in just few. Few inhabit depths of 12,000 feet has a cylindrical structure sea anemone sting, paralyze and their... Your student learn the names of each stage of the female ’ s look at the.! Appearance, it releases sperm through the mouth opening located on the underlying surface to attach to tiny species jellyfish... Inside nematocysts causes threads to uncoil disc to aid in attaching to and! Lower position of the tentacle of the body ( called a polyp ’ all. Once in a planktonic spore called the planula hooks onto a rock and grows into the water their lifecycle jellyfish! Ultimately spawn free-swimming, genetically identical medusae—the animals we recognize as jellyfish—which grow to in. We all go to the sea floor this is achieved by alternating with each generation between sexually... With a great user experience eggs of the body ( called a planula is tiny and oval-shaped minute. Produce both sexually and asexually 's sperm, they float around in its eternal waters main body free-swimming! The main phases include the larva, polyp, resembling a sea anemone that of an umbrella, tentacles... Couple of weeks tiny, bell-shaped marvels height and width after it reached maturity, is! Polyp and develops into a polyp and develops into a polyp ’ s look at the shore with! The colony on some support are called Hydrorhiza while other branches are vertical and known as Scyphistoma, has! Called the planula settles on a solid surface on the water both eggs sperm... When eggs and sperm to reproduce sexually, meaning that adult jellyfish sperm ) cycles...