Jellyfish is a very mesmerizing animal! We can all agree they are beautiful, right? Despite their wonderful look, this animal has no brain, bones, nor blood! So, what does it have, you might ask? Well, jellyfish possess only rudimentary sense organs. And, of course, as its name says, she has gelatinous body.
How does a jellyfish look like?
This amazing animal has a translucent bell fringed with pale tentacle, and as it pulse along, it almost seems as if the water itself has come alive. Pretty cool, right? These marine animals are mainly free-swimming, although a few are not mobile. Some of them may be anchored to the seabed by stalks. The bell can pulsate to provide propulsion and highly efficient locomotion.
Like tarantulas and black widows, jellyfish are spread all over the world. The true species are exclusively marine, but some of them live in freshwater. Large, often colorful, jellyfish are common in coastal zones worldwide. Did you know they exist more than 700 million years? Very impressive for brainless animals, right?
Jellyfish have a complex life cycle which includes both sexual and asexual phases. Moreover, the medusa is in the sexual stage in most instances. Sperm fertilize eggs, which develop into larval planulae, become polyps, bud into ephyrae and then transform into adult medusae. In some species certain stages may be skipped. Most of them are male or female, but there are even some hermaphrodites.
These animals are generally carnivorous. They feed on planktonic organisms, small fish, fish eggs and larvae, and other jellyfish, ingesting food and voiding undigested waste through the mouth. They hunt passively using their tentacles as drift lines, or sink through the water with their tentacles spread widely. The tentacles, which contain nematocysts to stun or kill the prey, may then flex to help bring it to the mouth.
Jellyfish and human.
It’s not uncommon when you go on the vacation to the sea to notice this beautiful animal. But, if it happens that she on accident stings you, that can be a very painful experience! Sadly, there is one specie, the sea wasp who is one of the most lethal jellyfish to humans. On the other hand, the immortal jellyfish has an infinite lifespan!
Did you know they can even be bioluminescent, producing their own light?
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