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Jellyfish are extremely rare in the fossil record
and specimens over 40 centimeters long are known
but other Carboniferous fossil finds around the world
alligators
Starfish (Class Asteroidea) Posters Jellyfish are extremely rare inStarfish (Class Asteroidea) Jurassic Age, Germany Starfish belong to a phylum of invertebrates known as Echinodermata. Echinoderms (Latin for "spiny skin") are named for their porous armor of calcite plates. Primitive Echinoderms first appeared in the fossil record 570 million years ago in the Lower Cambrian Period. Other Echinoderms include sea urchins, sand dollars, sea cucumbers, and sea lilies. The earliest known starfish appeared in the Lower
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