Last reviewwed on: 22nd November, 2020
Jellyfish originates from the phylum Cnidaria, which is a group of animals, all outward proportioned, comprises corals, sea anemones, hydras, and jellyfish. Jellyfish are accurately boneless, mindless, and merciless, and most are translucent. Although they do not have brains, jellyfish have a nervous system or nerve net, with receptors that can sense light, vibrations, and chemicals in the water.
Certain jellyfish have ocelli, which are eye like organs that are light perceptive and can sense up and down motions. Ocelli look as dark pigmented spots on the jellyfish, jellyfish can reproduce both sexually and asexually.
1. There are about 200 species of true jellyfishes
True jellyfish are species belonging to the Scyphozoa. Instances of true jellyfish comprise moon jellies, Mediterranean jellyfish, marine nettles, lion's shock jellyfish, blue jellies, and several other lesser well-known species. The Cubozoa include about 20 species not deliberated to be true jellyfish. The Cubozoa is also signified as to as box jellyfish.
The box jellyfish has more progressive vision, have 24 eyes that give it a 360 degree vision of its environment. It is also the world's most risky jellyfish, and the most poisonous marine creature. Some species of box jellyfish can slay a person in just a couple of minutes.
2. Jellyfishes comprises of more than 95% water
Their bodies are spineless and do not have a skeletal structure or outer shell. They are soft and easily damaged. Jellyfishes need water to support their body and if detached from their marine surroundings, they collapse and die.
3. Jellyfish are outward (radially) symmetrical
Jellyfish are proportioned about a central axis that goes through the length of their body, from the top of their bell to the ends of their limbs. They have a top and a bottom but they do not have left and right side and as a result vary from many other types of animals that show bilateral symmetry.
4. A jellyfish has an easy digestives system with only one opening
A jellyfish takes food in through its mouth which is positioned on the bottom if its bell. Food is digested in a bag-like structure named coelenteron or gastrovascular cavity. Leftover material is exhausted through the mouth.
A common correlation used to pronounce the fragile way jellyfish jump through the water compares their movements to a simple form of jet forward motion.
To travel forward, jellyfishes take water into their muscular bell and then shot it out behind them, making a jet of water that pushes the jelly forward.
Jellies also float on water flows to move. Although their poisonous defenses jellyfish have numerous predators. Swordfish, sharks, tuna, sea turtles, and salmon have been identified to prey upon the jellyfish.
5. Jellyfishes have no brain, blood, and nervous system
Their intelligences are primitive and comprise of a neural net, eye spots that can detect light from dark, and chemosensory pits that help them recognize potential prey.
6. A jellyfishes' body comprises of three layers
The outer coat is called the epidermis, the inner coat which lines the gastrovascular cavity is called the gastrodermis, and the middle coat comprises of a thick material called the mesoglea.
7. Thousands of nematocytes are positioned on the tentacles, feeding arms, and mouth of a jellyfish
Nematocytes comprise of a casing that holds a hollow pointed coil, a venom sac, and chemo-sensitive initiate hairs that detect when somewhat edible encounters against them. Once potential prey encounters against the trigger hairs, the nematocytes eject the coiled barb and insert venom into the victim through the hollow thread. The venom restrains the prey and the jellyfish uses its oral arms to transfer the prey into its mouth where it is handed through to the coelenteron for digestion.
More than any other marine organism, jellyfish lead the water. The scyphozoan class of jellyfish is discovered in every ocean in the world, and the hydrozoan class can thrive in freshwater lakes and ponds.
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Posted by: Lusubilo A. Mwaijengo
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