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The 8 Oldest Animal Species on Earth

By Steven Romano Nov 21, 2013

5 of 9

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Jellyfish

Jellyfish lack a backbone, a brain, eyes (in the traditional sense), and a heart—they still donate to charity, though—but these ghostly globs of stinging tentacles have been on Earth for roughly 500 million years as evidenced by impressions left behind in the fossil record! And they show no signs of slowing down, either. Due to gradual changes in global temperature, warmer climes have led to increases in jellyfish populations, of which are known as “blooms.”

Tags: animals, science, jellyfish, slideshows, lizards, earth

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About the Author
Steven Romano

Like Captain America, Steven Romano is just a boy from Brooklyn. When he isn't contributing to The MindHut and other geeky websites, Steven's hard at work writing his first novel and comic book scripts. Follow him on Twitter @Steven_Romano, and swing by his blog: stevenromano.tumblr.com

Wanna contact a writer or editor? Email contribute@sparknotes.com.