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: Wednesday Dec-12-2018 21:23:32 EST
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ERA DINOSAURS Starfish Fossil Specimen Rare Cretaceous Triassic Collectible

AU $75.00
End Date: Thursday Jan-3-2019 17:53:41 EST
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ANCIENT STARFISH FOSSILS ON PLATE MATRIX -Great Details, appr 14x14cm, OZ Seller

AU $145.00
End Date: Wednesday Jan-2-2019 20:07:37 EST
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Fossil Sea Urchin Lot of 2 Specimens for Display or Jewelery Craft 14

AU $13.21
End Date: Monday Dec-31-2018 16:47:53 EST
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5.2" Starfish Fossil See Star Ordovician Period Decorative Mineral Stone Morocco

AU $38.15
End Date: Saturday Dec-15-2018 11:03:35 EST
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68mm Madagascar Sand Dollar Petrified Sea Urchin Polished Oursin Fossil Mineral

AU $18.38
End Date: Saturday Dec-15-2018 11:03:29 EST
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5" Starfish Fossil Natural Geocoma Corinata Fossilized Mineral See Star Morocco

AU $36.83
End Date: Saturday Dec-15-2018 11:03:28 EST
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