The medusa (medusae, plural) is a bell-shaped form. It is typically able to move. The polyp is a tubular form. It is usually attached to a surface and unable to move.
The class Anthozoa includes all cnidarians that exhibit a sessile polyp body plan only; in other words, there is no medusa stage within their life cycle.
Sponges are unsymmetrical or radially symmetrical, with many cell types but no distinct tissues; their bodies contain numerous pores and sharp protective spicules. Coelenterates (phylum Cnidaria) are radially symmetrical, with two tissue layers (ectoderm and endoderm) surrounding an all-purpose gastrovascular cavity.
Polyps have a tubular shape and are fastened at their base, with the mouth facing the water at the other end of the tube. Medusa has a bell-shaped body with hanging tentacles. Polyp does not have a manubrium. The Hydrozoa class's Medusa has a manubrium, a tube that hangs from the bell.
Cnidarians come in two basic shapes. An anemone is the polyp shape. If the polyp shape is turned upside down, it becomes the medusa shape of the jellyfish.
Through budding, new polyps “bud” off from parent polyps to form new colonies. In fragmentation, an entire colony (rather than just a polyp) branches off to form a new colony.
Polyps reproduce asexually by propagating lateral clonal buds. Under certain environmental conditions, polyps release tiny jellyfish (ephyrae) into the water column through a process called strobilation.
Polyps are very common, especially in the Western world, and are a little more commonly found in men than women. They are unusual below the age of 40 and seem to occur most often in people over the age of 60. They affect one in four people over the age of 50 years.
The medusa is the reproductive stage; their eggs are fertilised internally and develop into free-swimming planula larvae. After a brief period floating about in surface waters, the larvae settle to the sea floor, attaching themselves at one end. There they develop into polyps and begin to feed and grow.
Throughout their lifecycle, jellyfish take on two different body forms: medusa and polyps. Polyps can reproduce asexually by budding, while medusae spawn eggs and sperm to reproduce sexually.
The approximately 5,000 living sponge species are classified in the phylum Porifera, which is composed of three distinct groups, the Hexactinellida (glass sponges), the Demospongia, and the Calcarea (calcareous sponges). Sponges are characterized by the possession of a feeding system unique among animals.
Living sponges have traditionally been divided into three or perhaps four classes: Homoscleromorpha, Calcispongiae, Hexactinellida, and Demospongiae. The former is considered a clade with an absent skeleton or a skeleton of siliceous spicules without an axial filament.
cnidarian, also called coelenterate, any member of the phylum Cnidaria (Coelenterata), a group made up of more than 9,000 living species. Mostly marine animals, the cnidarians include the corals, hydras, jellyfish, Portuguese men-of-war, sea anemones, sea pens, sea whips, and sea fans.
Scientists have determined that humans likely descended from sponges that lived in early oceans 750 million years ago. According to the researchers, these creatures are the eldest ancestors of all animals.
Most sponges are hermaphrodites (function as both sexes simultaneously), although sponges have no gonads (reproductive organs).
Sponges can live for hundreds or even thousands of years. "While not much is known about the lifespan of sponges, some massive species found in shallow waters are estimated to live for more than 2,300 years," the study authors write.
Since Medusa was the only one of the three Gorgons who was mortal, Perseus was able to slay her while looking at the reflection from the mirrored shield he received from Athena. During that time, Medusa was pregnant by Poseidon.
The snake-haired Medusa does not become widespread until the first century B.C. The Roman author Ovid describes the mortal Medusa as a beautiful maiden seduced by Poseidon in a temple of Athena. Such a sacrilege attracted the goddess' wrath, and she punished Medusa by turning her hair to snakes.
In the original story, the Medusa was a beautiful woman who held a very positive role. Tragedy fell upon her when she was confronted with endless hardships brought upon by male actions. Medusa was a beautiful woman who was raped, killed and beheaded by various gods.
In some cases, uterine polyps that grow towards the cervix or are near to that area, known as cervical polyps, can burst if knocked during sexual intercourse. As a consequence, they will begin to bleed. Read the full article on: What is an endometrial or uterine polyp?
Anyone can develop colon polyps. You're at higher risk if you're 50 or older, are overweight or a smoker, or have a personal or family history of colon polyps or colon cancer.
There are possibilities you can still become pregnant, even if you have polyps in your uterus. While there is a connection between uterine polyps and infertility, the proper care and treatment could help you achieve pregnancy.
It is believed that uterine polyps may contribute to infertility because: They make it more difficult for a fertilized egg to attach to the uterine walls. They block sperm from joining with an egg. They block sperm from entering the uterus.
Hydra is a sessile and cylindrical polyp form.