Giant dragon flies, as they are commonly called, appears in evolutionary history during Carboniferous period, which lasted from about 359 to 299 million years ago. Very similar in appearance to modern day dragon flies, they are the biggest flying...
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Occassionally, brittle stars are seen in the body of jelly fishes. Interesting fact is the food sources of brittle stars seems to be mesozooplanktons and they were never observed with arms out in water. Then, where do they get their food from? They take food directly from the mouth or the oral arms of the jelly fish. It means, they are stealing food from the jellyfish which are pelagic predators. There are several reports of other brittle stars moving down into the feeding arms or near the mouth and stealing food directly from the host. So these are called as KLEPTOPARASITES.