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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100% Natural Fossil Sea Urchin (Cretaceous Period)

AU $35.00 (0 Bids)
End Date: Tuesday Aug-27-2019 16:27:21 EST
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Four Starfish Fossil Pygurus Marmonti SAND DOLLARS From Madagascar (#K9773)

AU $27.50
End Date: Saturday Sep-14-2019 15:49:22 EST
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5.2" 160g Starfish Fossil Star Fossilized Ordovician Period Specimen - Morocco

AU $39.84
End Date: Friday Sep-13-2019 23:20:25 EST
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200g 6.4" Starfish Fossil Geocoma Corinata Fossilized Mineral See Star - Morocco

AU $41.32
End Date: Friday Sep-13-2019 23:20:23 EST
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GEOLOGICAL ENTERPRISES Silurian very rare fossil starfish Australaster giganteus

AU $59.12
End Date: Monday Sep-9-2019 1:42:03 EST
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Fossil Sea Urchin Lot of 2 Specimens for Display or Jewelery Craft 14

AU $14.77
End Date: Thursday Sep-5-2019 15:38:44 EST
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Four Starfish Fossil Pygurus Marmonti SAND DOLLARS From Madagascar (#K9771)

AU $27.50
End Date: Thursday Sep-5-2019 12:27:54 EST
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