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 Mar-4-2020 10:59:28 EST
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Starfish Fossil Ordovician 450 Million Years Ago Morocco #15126 63o

AU $211.95
End Date: Thursday Mar-26-2020 10:39:05 EST
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Antique fossil Sea Urchin Jurassic rock 331gms #17

AU $48.99
End Date: Monday Mar-23-2020 5:33:57 EST
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Gitolampas Neuvillei Sea Urchin Fossil Bartonien of / the 33 II

AU $8.18
End Date: Monday Mar-23-2020 3:07:54 EST
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3 Hemiaster Sp Sea Urchin Fossil Campanian of / the 16 French

AU $6.55
End Date: Monday Mar-23-2020 2:33:58 EST
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Sismondia Occitana Sea Urchin Fossile Eocene Lutetien Médoc

AU $6.55
End Date: Monday Mar-23-2020 2:33:58 EST
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3 Hemiaster Sp Sea Urchin Fossil Campanian of / the 16 France

AU $6.55
End Date: Monday Mar-23-2020 2:33:57 EST
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