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a siphonophore that lives in the deep sea at 700 m to 1,000 m below sea level of Iceland, Greenland, and Chile
Length: 150-275 feet long
Phylum: Cnidaria
Scientific name: Praya dubia
Class: Hydrozoa
Longest animal in the sea
attracts prey with a light blue light
Praya dubia’s diet includes gelatinous sea life, small crustaceans, and possibly small fish and fish larvae.
Has no known predators

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Cyanea capillata(Lion's mane jelly fish)is one of the largest jellyfish in the world. Its umbrella-shaped body can reach two meters, and there are eight groups of tentacles, which can be more than 35 meters long. It grows mainly in colder waters, including the Arctic Sea, the North Atlantic Ocean, and the North Pacific Ocean, and rarely grows in areas below 42 degrees north latitude. There are similar species of jellyfish in Australia and New Zealand.

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Genius name - trachaphyllia
The cerebral-looking organisms known as brain corals do not have brains, but they can grow six feet tall and live for up to 900 years. Found in the Caribbean, Atlantic, and Pacific Oceans, brain corals display what is known as Me-android tissue integration. This means that the polyps, which are the basic living unit of corals, are highly associated to one another. Their tissues are more closely connected than those of other corals and are not separated by skeletal structures. Many researchers think that the more integrated a coral's polyp tissue is, the more advanced the coral species.

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Scientific name: Montipora foliosa
Kingdom: Animalia
Phylum: Cnidaria
Class: Anthozoa
Genus: Montipora

Cabbage Coral are typically found in the waters of Australia in the Great Barrier Reef, Coral Sea, and Houtman Abrolhos Islands. Cabbage Coral is found in a wide variety of colors and grows in colonies of thin plates with ridges. The habitat for Cabbage Coral is usually located on protected upper reef slopes and shallow waters ranging from 0 to 9 feet. They tend to live in calmer waters. In the wild, Cabbage Coral get their nutrients from interactions between a marine algae known as zooxanthellae. They can also capture planktonic organisms from the water and can dissolved organic matter.

Interesting facts:
- Fasting growing Montipora
-They reproduce sexually and asexually. In the wild, they release eggs and sperm at the same time; this creates a free swimming planula larva. Eventually, this larva attaches to a substrate. This will them form a tiny polyp  and becomes coral.

Source: http://animal-world.com/Aquarium-Coral-Reefs/Cabbage-Coral

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razil. Then from the Western Pacific from the Sea of Japan to the South China Sea.  - They have to be in warm waters with an average temperature of 23 degrees Celsius which is 

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Matt Pycela - Cannonball Jellyfish (Stomolophus)- Scientific name: Stomolophus meleagris- Habitat: The population of these jellyfish are distributed in the deepest ocean in the world which is the Pacific, mid regions of the Atlantic, and in waters of New England all the way to Brazil. Then from the Western Pacific from the Sea of Japan to the South China Sea.  - They have to be in warm waters with an average temperature of 23 degrees Celsius which is considered to be ideal for these swimmers.  - Structure: They have a symbiotic relationship with the portly spider crab. -Interesting Facts- Cannonball jellyfish are commercially harvested as food for humans.

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Matt Pycela - Cannonball Jellyfish (Stomolophus)- Scientific name: Stomolophus meleagris- Habitat: The population of these jellyfish are distributed in the deepest ocean in the world which is the Pacific, mid regions of the Atlantic, and in waters of New England all the way to Brazil. Then from the Western Pacific from the Sea of Japan to the South China Sea.  - They have to be in warm waters with an average temperature of 23 degrees Celsius which is considered to be ideal for these swimmers.  - Structure: They have a symbiotic relationship with the portly spider crab. -Interesting Facts- Cannonball jellyfish are commercially harvested as food for humans.

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-It has a bell that is of the shape of a dome, and this is what gives it its look. Unlike most species of jellies, this one lacks tentacles, but is equipped with oral arms underneath the body.
-Cannonballs are an important food source for leatherback turtles, so preserving the cannonball jellyfish is important.
- The cannonball jellyfish, also known as the cabbage head jellyfish, is a species of jellyfish in the family Stomolophidae. Its common name derives from its similarity to a cannonball in shape and size. Its dome-shaped bell can reach 25 cm in diameter and the rim is sometimes colored with brown pigment.
-Kingdom: Animalia
-Class:  Scyphozoa
-Phylum: Cnidaria
-Source: https://animalsake.com/facts-about-cannonball-jellyfish

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Immortal Jellyfish:
Turritopsis dohrnii

Size: A small, biological Immortal Jellyfish
Location: Found in Mediterranean Sea and in Water of Japan.
T. dohrnii begin their life as free-swimming tiny larvae known as planula. As a planula settles down, it gives rise to a colony of polyps that are attached to the sea-floor. All the polyps and jellyfish arising from a single planula are genetically identical clones. The polyps form into an extensively branched form, which is not commonly seen in most jellyfish. Jellyfish, also known as medusae, then bud off these polyps and continue their life in a free-swimming form, eventually becoming sexually mature. When sexually mature they have been known to prey on other jellyfish species at a rapid pace.

Most jellyfish species have a relatively fixed life-span,which varies by species from hours to many months .The medusa of Turritopsis dohrnii is the only form known to have developed the ability to return to a polyp state, by a specific transformation process that requires the presence of certain cell types

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The giant green anemone, is a species of intertidal sea anemone of the family Actiniidae. Other common names for this anemone include green surf anemone, giant green sea anemone, green anemone, giant tidepool anemone, anemone, and rough anemone. It prefers to inhabit sandy or rocky shorelines, where water remains for most of the day. A compound from the giant green anemone is now used as a vertebrate heart stimulant. Some fishes develop resistance to the giant green anemone's sting by covering themselves with mucus.

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Names: Cubozoa (Box Jellies)
Swim pretty fast,  maneuver around things, see fairly well despite not having a brain. Some of them can produce extremely potent venom.

In the center of the underside of the bell is a mobile appendage called the manubrium which somewhat resembles an elephant's trunk. At its tip is the mouth. The interior of the bell is known as the gastrovascular cavity. It is divided by four equidistant septa into a central stomach and four gastric pockets. The eight gonads are located in pairs on either side of the four septa.

Danger to humans:
Although the box jellyfish has been called "the world's most venomous creature", only a few species in the class have been confirmed to be involved in human deaths, and some species pose no serious threat at all

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sea anemone

It is a kind of carnivore that grows in the water. It belongs to the cnidaria, a species of the genus of the six genus Coral. It is a very simple animal with no central information processing mechanism, which means that it does not even have the lowest level of brain. have.
Although an anemone looks like a flower, it is actually a predator. Its dozens of tentacles have a special thorn cell that releases toxins.

Invertebrates, coelenterates, corals, and monolayers of lower embryos. It has no exoskeleton and all live in the ocean. The individual in the warm sea is large, the body is cylindrical, and the lower end (base) is slightly enlarged, which is called the base plate and can secrete mucus. Due to the action of mucus and muscle, it can be fixed on shallow rocks, stakes or shells, and crab claws. Some species will not move once they are fixed, and some species can slide slightly on them.

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Moon jellyfish

Aurelia aurita (also called the common jellyfish, moon jellyfish, moon jelly or saucer jelly).

The jellyfish is translucent, usually about 25–40 cm (10–16 in) in diameter, and can be recognized by its four horseshoe-shaped gonads, easily seen through the top of the bell. It feeds by collecting medusae, plankton, and mollusks with its tentacles, and bringing them into its body for digestion. It is capable of only limited motion, and drifts with the current, even when swimming.

Aurelia does not have respiratory parts such as gills, lungs or trachea, it respires by diffusing oxygen from water through the thin membrane covering its body.

be eaten by a wide variety of predators, including the ocean sunfish (Mola mola), the leatherback sea turtle (Dermochelys coriacea), the scyphomedusa Phacellophora camtschatica, and a very large hydromedusa (Aequorea victoria).

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Staurozoa: The most rare of these types of cnidarians, staurozoans are stalked jellyfish that dwell in cold, near-shore water attached to the substrate. They appear to be upside down jellyfish, with tentacles that project upwards from their trumpet-shaped bells and a singular stalk protruding from the center. Sexually mature adults spawn sperm and eggs that fertilize in the water column, which become larvae that crawl the ocean floor in search of a suitable home. When it is found, they attach themselves and begin the maturation process into adulthood.

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(Portuguese man o' war )

genus name: Physalia
phylum: Cnidaria
It isn’t actually even a single animal. It is actually a whole colony of organisms working together in peace and harmony. The name comes from the air filled bladder that acts as a float and sail – this was thought reminiscent of the 17th century naval ships called men-of-war.
location: found throughout the oceans of the world and has been sighted as far north as Scotland
The sting itself is characterized by a painful raised whip-like welt across the skin. These can last from an hour to several days.

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White Spotted Jellyfish is also called Australian Spotted Jellyfish these are the native to Southwestern of Pacific Ocean. Fairly large they generally consume snail species but they have become a concern in some areas because of the huge amount of water they filter, digesting plankton that some food fish and other fish need.
Phylum‎: ‎Cnidaria

Species‎: ‎punctata

Class‎: ‎Scyphozoa

Genus‎: ‎Phyllorhiza

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(or the Cyanea lamarckii are apart of the cyaneidae family and  live in the western pacific near japan they eat small  crustaceans and plankton they see while drifting across in the ocean because they live in the western part of the pacific ocean their natural habitat is warm/ cool

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Mauve Stinger (Pelagia Noctiluca)nqrr
Roughly the size of a golf ball, these are known to survive in warm and temperate waters of Mediterranean Sea, Red Sea and Atlantic Ocean. Their stings are slightly painful, but is limited to only a small period of time and does not cause much harm.

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Scientific name: Heliopora coerulea
Phylum: Cnidaria
This coral is known to produce a massive skeleton formed of aragonite, making it extremely hard. It is connected by thin layers of tissue over the outside of the skeleton. It can be found in marine and fresh water areas.

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Moon Jellyfish (Aurelia Aurita).
Genus name: Aurelia
The most common species in the world can be identified through the four horseshoe-shaped gonads.
These jellyfish are found near coastal waters throughout the world mostly the Pacific, Atlantic, and Indian oceans. Most Jelly's prefer a temperature of around 48 to 66 degrees Fahrenheit, but because of these creatures are hardy creatures they can survive in temperatures ranging from 21 to 88 degrees Fahrenheit. Not only can moon jellyfish survive in salt water, but also where salt and fresh water meet which is called brackish water, and sometimes even known to survive in fresh water.

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Matt Pycela - Cannonball Jellyfish (Stomolophus)

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Matt Pycela - Cannonball Jellyfish (Stomolophus)

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- Scientific name: Stomolophus meleagris
- Habitat: The population of these jellyfish are distributed in the deepest ocean in the world which is the Pacific, mid regions of the Atlantic, and in waters of New England all the way to Brazil. Then from the Western Pacific from the Sea of Japan to the South China Sea.
- They have to be in warm waters with an average temperature of 23 degrees Celsius which is considered to be ideal for these swimmers.
- Structure: They have a symbiotic relationship with the portly spider crab.

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Immortal Jellyfish:
Turritopsis dohrnii

Size: A small, biological Immortal Jellyfish
Location: Found in Mediterranean Sea and in Water of Japan.

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scyphozoa -
Upside-down jellyfish (Cassiopea andromeda)

Upside-down jellyfish lives in mud flats, shallow lagoons, and around mangroves in flordia and the caribian. they usually live upside-down on the bottom, which has earned them the common name. Where found, there may be numerous individuals with varying shades of white, blue, green and brown. They can measure up to 300 mm wide and can reproduce sexualy and asexualy. They have a mild sting since they are primarily photosynthetic, but sensitive individuals may have a stronger reaction. The photosynthesis occurs because, like most corals, they host zooxanthellae cv in their tissues

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Irukandji Jellyfish (Carukia barnesi)
Kingdom: Animalia
Phylum: Cnidaria

Class: Cubozoa

Location: Ranges from Australia to the British isles
What the Irukandji jellyfish lacks in size it makes up for in the power of its venom. The name is derived from the Irukandji people of North Australia, as this is where the jellyfish was first observed. However, it appears to be much more widespread than this with specimens allegedly found as far away as the British Isles.
Measuring only 5mm (0.2 ins) across and with tentacles less than 1 metre (3 ft) it is one of the smallest members of the box jellyfish family. The venom though is insanely powerful; it is reputedly the most venomous animal toxin on earth, over 100 times more powerful than that of the cobra. In addition to this the Irukandji Jellyfish is unique in having stingers on its bell as well as tentacles.
The only reason this jellyfish isn’t at the top of the list is its small size. Despite this the sting is without doubt potentially lethal. Often one sting will not kill as long as appropriate treatment is given. In non fatal stings Irukandji syndrome may develop with delightful symptoms such as excruciating muscle cramps, severe pain in the back and kidneys, burning sensation of the skin and face, vomiting, headache and increased heart rate. Victims have also described a ” feeling of impending doom”

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Sea Nettle eat by immobilize and obtain their prey using their stinging tentacles. After that, the prey is transported to the gastrovascular cavity where it is subsequently digested. Sea nettles are also able to consume minnows, bay anchovy eggs, worms, and mosquito larvae.
They are located coastal waters off Alaska to California, Japan, Kamchatka, the Aleutian Islands and the Bering Sea

The Sea Nettleis radially symmetrical, marine, and carnivorous. Its mouth is located at the center of one end of the body, which opens to a gastrovascular cavity that is used for digestion. It has tentacles that surround the mouth to capture food. it has no resportary organs.
Fun Facts
Sea nettles sometimes act as transportation for other animals.
rabs can attach themselves to the bodies of the nettle jellyfish until they arrive at the shore. Often times the crabs will snack on the nettles on the way there.
A real name for this jellyfish is Chrysaora fuscescens

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Sean Nusdeo
Phylum - Cnidaria
Kingdom - Animalia
Location - Warm coastal water around the world, specifically the Indo-Pacific region and Northern Australia.
Structure - There Medusa is box shaped. From each of the four corners hangs a short stalk that bears hollow tentacles. In the center of the underside of the bell is a mobile appendage called the manubrium which somewhat resembles an elephant's trunk. The interior of the bell is known as the gastrovascular cavity. It is divided by four equidistant septa into a central stomach and four gastric pockets.
Behavior -  The box jellyfish actively hunts its prey (small fish), rather than drifting as do true jellyfish. They are capable of achieving speeds of up to 1.5 to 2 meters per second.
Dangers to humans - known as the most venomous creature in the world. The Box Jellyfish is more developed and intelligent than most other jellyfish. It has 24 pairs of eyes and over 5,000 stingers on each tentacle.

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Sea anemones and Corals - Anthozoa
Hexacorallia - a subclass of sea anemones and corals, the tentacles are simple and unbranched, more than 8 tentacles. It is a subclass that includes all stony corals, sea anemones, and zoanthids. Completes a full life cycle which includes, a planktonic phase and then a sessile phase. Been considered to be monophyletic (all contained species are from a common ancestor). Reproduce asexually (budding).
Phylum - Cnidaria
Kingdom -  Animalia
Habitat - Marine habitats, the locations vary at different oceans throughout the world. The most varied and largest are found in tropical, coastal waters.

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Hydra (Hydrozoa)
Is a sea anemone
Kingdom- Animalia
Location- The Live in Fresh Water
Several Species are located in american water, however there is one species in Britain that used to live in brackish water but then migrated to Fresh water. Native to Tropic Water
Has Radial Symmetry
Body Structure At the free end of the body is a mouth opening surrounded by one to twelve thin, mobile tentacles. Each tentacle, or cnida (plural: cnidae), is clothed with highly specialized stinging cells called cnidocytes.
They are mainly sedentary or sessile but can move, especially when hunting, they typically attach themselves to a substrate.
Hydras reproduce Asexually by producing buds in the body wall, which grow to be miniature adults and break away when they are mature.

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Sea Anemone (Aiptasia)-
Aiptasia is a widely distributed genus of temperate and tropical sea anemones of benthic lifestyle typically found living on mangrove roots and hard substrates.

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Scyphozoa

Lion's mane Jellyfish

Kingdom-Anamalia
Genus-Cyanea
Family-Cyaneidae

Found commonly in the open ocean, the lion's mane jellyfish is the largest jellyfish in the world.

Lion's mane jellyfish are named for their showy, trailing tentacles reminiscent of a lion's mane. They can vary greatly in size: although capable of having a bell diameter of over 2 metres (6 ft 7 in), those found in lower latitudes are much smaller than their far northern counterparts, with a bell about 50 centimetres (20 in) in diameter.

Size seems to dictate coloration: larger specimens are a vivid crimson to dark purple while smaller specimens grade to a lighter orange or tan, occasionally colorless.

The bell of the lion's mane jellyfish is scalloped into eight lobes (lappets), each lobe containing from 70 to 150 tentacles, arranged in four fairly distinct rows. Along the bell margin is a balance organ at each of the eight indentations between the lobes, which helps the jellyfish orient itself. From the central mouth extend broad frilly oral arms with many stinging cells. Closer to its mouth, its total number of tentacles is around 1200.

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Location- Australia
Name- Box jellyfish
Structure
- only jellyfish with an active visual system
- Medusa is box shaped (which gives it its name)
- Medusa is up to 2 inches long
Tentacles are up to two feet long
cnidarian invertebrate
Venom
-Chironex fleckeri,Carukia barnesi and Malo kingi
-Stings can be fatal to humans
Defense and Feeding
Tentacles surrounding the mouth contain nematocysts. The nematocysts are the cnidarians' main form of offense or defense and function by a chemical or physical trigger that causes the specialized cell to eject a barbed and poisoned hook that can stick into, ensnare, or entangle prey or predators, killing or at least paralyzing its victim.

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Aurelia aurita

These two layers are separated by a layer of a jelly-like substance called mesoglea. The tentacles, the most famous body part of the jellyfish, are covered with the stinging organs.

They are simple animals, in that they contain only a few cell types and body parts, but are incredibly complex.

Jellyfish Habitat Facts and Information. The habitat for Jellyfish is very vast as they can live in any ocean water. With over 2,000 species out there they have been able to find plenty of locations where they can thrive.

Jellyfish glow in the dark

Some jellyfish are immortal

Jellyfish can clone themselves

Not all jellyfish have tentacles