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Ophiacodon by ABelov2014.deviantart.com on @DeviantArt

Ophiacodon by ABelov2014.deviantart.com on @DeviantArt

Jimbacrinus Bostocki was a crinoid with five arms,which were lined with fine tentacle-like structures called pinnules. Like all crinoids, it used these unfurled arms to feed on small animals and particles in the water. They were abundant seafloor animals in what is now Western Australia during the Permian.

Jimbacrinus Bostocki was a crinoid with five arms,which were lined with fine tentacle-like structures called pinnules. Like all crinoids, it used these unfurled arms to feed on small animals and particles in the water. They were abundant seafloor animals in what is now Western Australia during the Permian.

Plate of 10 Eurypterids (19x12 in) Eurypterid remipes (Sea Scorpians) Silurian Age - 400 million yrs Fiddler Green Formation Herkimer County, New York - USA

Plate of 10 Eurypterids (19x12 in) Eurypterid remipes (Sea Scorpians) Silurian Age - 400 million yrs Fiddler Green Formation Herkimer County, New York - USA

Moroccan deposits from the Ordovician era look like a sort of Lost World. Species thought to have died out 20 million years earlier in the Cambrian era sit next to others that were not believed to have evolved by the time the deposits were laid down.

Moroccan deposits from the Ordovician era look like a sort of Lost World. Species thought to have died out 20 million years earlier in the Cambrian era sit next to others that were not believed to have evolved by the time the deposits were laid down.

The End of the Garden of Ediacara. Ediacaran fossil found in the Swartput Farm site. (Sarah Tweedt / Smithsonian Institution)

The End of the Garden of Ediacara. Ediacaran fossil found in the Swartput Farm site. (Sarah Tweedt / Smithsonian Institution)

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