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: Thursday Oct-17-2019 12:36:30 EST
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Fossil Sea Urchin Lot of 2 Specimens for Display or Jewelery Craft 14

AU $14.70
End Date: Wednesday Nov-6-2019 16:05:55 EST
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Echinoid Sea Urchin Fossil (Unidentified) In Fossiliferous Chalcedony Agate

AU $11.12
End Date: Sunday Nov-3-2019 9:16:27 EST
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Echinoid Sea Urchin Fossil (Unidentified) In Chalcedony Agate With Quartz Druzy

AU $18.54
End Date: Saturday Nov-2-2019 9:18:53 EST
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Echinoid Sea Urchin Fossil Echinocorys Scutata In Chalcedony Agate - 120x90x45mm

AU $92.80
End Date: Saturday Nov-2-2019 9:18:53 EST
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Fossil Starfish Australia Salteraster selwynii Clonbinane Victoria (EA6568)

AU $56.15
End Date: Tuesday Oct-29-2019 20:08:08 EST
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Starfish (Petraster sp) - Morocco - Ordovician Period

AU $77.94
End Date: Sunday Oct-27-2019 4:17:29 EST
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