JellyFish Facts

Cnidarians Jellyfish

Cnidarians Jellyfish picture

Cnidarians Jellyfish

Cnidaria is represented by polyps which are animals such as sea Anemones, beautiful corals and Jellyfish which are medusae. A polypoid o a medusoid cnidarian is an animal which is symmetrical in some way. These creatures only have one opening on their body which is their mouth. The mouth is surrounded by various numbers of tentacles which are covered in tiny stinging cells which are called nematocysts which are for both offensive and defensive use.

Cnidarians have bodies which consist of dual cell layers, the first layer is the endoderm or the gastrodermis and the second layer is the ectoderm or the epidermis. The mesoglea is located between these two cell layers and may be simply like glue designed to hold the layers together such as seen in Hydra up to being the majority of the creature itself such as seen in the Scyphozoa class jellyfish.

Every single cnidarian is a carnivore using their cnidae and tentacles to capture their prey. Usually these creatures feed on prey that simply made a mistake and found themselves caught in the jellyfish tentacles, this is food by chance. There are some cnidarians which are able to absorb organic matter which has been dissolved in seawater although it is no clear on just how many cnidarians and which types are able to do this.

The most commonly seen and recognised types of Cnidarians are jellyfish. These marine creatures come in a huge variety of sizes and they can range in color from opaque or white or clear to pinks and reds and even purples and blues. Jellyfish can be found in waters all over the world and are not just confined to the oceans. These sea dwelling creatures can be found in many lakes, rivers and creeks as well as beaches.

These tentacled creatures can live anywhere from the shiny glass like surface of the water right down to the deep dark depths of the sea bed floor. Some of these creatures are capable of actually swimming but the majority of them are not and rely solely on the tide and the currents to travel throughout the waters. Jellyfish can range in size from as small as an adults little finger fingernail right up to as large as basketballs and even bigger.

All jellyfish are capable of stinging although some may not cause any discomfort in humans that have been stung. It is important to not purposely touch or agitate a jellyfish though as some jellyfish possess a highly toxic venom that is injected into the victims skin upon contact with the marine creature and it is this venom that can in fact be fatal to humans causing respiratory and cardiac distress. There are surely many jellyfish lurking in waters throughout the world which are yet to even be discovered and it is unknown just what we may be able to learn by studying these beautiful sea dwelling creatures.

A jellyfish lacks any skeleton and they are very fragile creatures to the point where if they wash up on a beach they will die. Learn more about jellyfish!

Learn more about Jellyfish, different Jellyfish Species, general Jellyfish Information, Jellyfish Pets and Jellyfish Safety

Written by and Sudarsana Sinha.

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