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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Huge fossil starfish - Promopaleaster - and crinoids - Waynesville fm, Ohio

AU $700.72
End Date: Tuesday Mar-19-2019 4:45:25 EST
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100% Natural Fossil Sea Urchin (Cretaceous Period)

AU $35.00 (0 Bids)
End Date: Thursday Feb-21-2019 21:22:47 EST
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Four Starfish Fossil Pygurus Marmonti SAND DOLLARS From Madagascar (#K3518)

AU $27.50
End Date: Wednesday Mar-6-2019 17:44:22 EST
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ERA DINOSAURS Starfish Fossil Specimen Rare Cretaceous Triassic Collectible

AU $75.00
End Date: Wednesday Mar-6-2019 9:10:23 EST
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Fossil Sea Urchin Lot of 2 Specimens for Display or Jewelery Craft 14

AU $14.00
End Date: Monday Mar-4-2019 12:50:22 EST
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91mm Starfish Fossil Geocoma Carinata Ordovician Period Decorative Stone Morocco

AU $39.17
End Date: Saturday Feb-23-2019 2:24:49 EST
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GEOLOGICAL ENTERPRISES Silurian very rare fossil starfish Australaster giganteus

AU $47.64
End Date: Thursday Feb-21-2019 3:37:31 EST
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