Ancient Species -
Starfish & Sea Urchins

Blastoids and crinoids are echinoderms which have stalks and keep their mouths pointed upward. Sea urchins and starfish are echinoderms with their mouths pointed down and no stalks.

The earliest ancestors of the starfish appeared in the Cambrian Period (590 to 303 million years ago). They were shaped like flattened balls and ate things lying in the mud. By the Ordovician Period (505 to 434 million years ago), they had evolved into a plump star shape with five or more points. Each point contained a branch of the stomach but there was only one mouth in the center.

Early sea urchins resembled melons covered in spines. In some, the spines were needle-like; in other, they were quite thick. All sea urchins have five double rows of plates. In modern sea urchins, these plate contain holes through which tubular feel , called ambulacra, extend.

 

Starfish & sea urchin fossils now available (at eBay):

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Amphiope Bioculata Sea Urchin Fossil Miocene Serravalien French France

AU $32.45
End Date: Tuesday Jul-7-2020 0:14:17 EST
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Collyrites Ovalis Sea Urchin Fossil Callovian Sarthe France

AU $4.87
End Date: Monday Jul-6-2020 23:42:15 EST
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Echinolampas Sp Sea Urchin Fossil Eocene Spain

AU $4.88
End Date: Sunday Jul-5-2020 17:05:27 EST
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Collyrites Ovalis Sea Urchin Fossil Callovian Sarthe France French

AU $4.88
End Date: Saturday Jul-4-2020 2:30:13 EST
Buy It Now for only: AU $4.88
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Gorgeous Sea Urchin Table Lamp.

AU $300.00
End Date: Thursday Jul-2-2020 15:19:49 EST
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Amphiope Bioculata Sea Urchin Fossil Miocene Serravalien France

AU $32.62
End Date: Thursday Jul-2-2020 2:58:05 EST
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3 Collyrites Ovalis Sea Urchin Fossil Callovian Sarthe France

AU $4.89
End Date: Thursday Jul-2-2020 2:58:00 EST
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