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This jellyfish fossil is from the Cambrian period, more than 500 million years ago.
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Fossil Jellyfish

 How long have jellyfish lived in the ocean? This jellyfish fossil is from the...
dugong feeds on seagrass in the Red Sea
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Dugong Feeding

 Dugongs, along with manatees, make up a group of marine mammals called sirenians or...
Hedbergella sliteri - this specific specimen is the "holotype" for this species. That means it is the reference point for what all members of the species should look like.
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Hedbergella sliteri

 Hedbergella sliteri - this specific specimen is the "holotype" for this species....
Photograph of the model of a Giant Megatooth Shark, taken from the front..
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Giant Megatooth Model

 A life-sized model suspended over visitors at the San Diego Natural History Museum...