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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Agassizia Mossomi Sea Urchin Fossil Langhien Portugal With

AU $9.84
End Date: Saturday Sep-12-2020 2:08:21 EST
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Macraster Meghilensis Sea Urchin Fossil Cenomanien Tunisia R

AU $24.61
End Date: Saturday Sep-12-2020 2:03:09 EST
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Periaster Verneuilli Sea Urchin Fossil Turonien Morocco Z

AU $13.12
End Date: Saturday Sep-12-2020 2:03:07 EST
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Dendraster Ashleyi Sea Urchin Fossil Pliocene California USA E

AU $13.12
End Date: Saturday Sep-12-2020 2:03:07 EST
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Dendraster Ashleyi Sea Urchin Fossil Pliocene California USA Z

AU $16.41
End Date: Saturday Sep-12-2020 2:03:05 EST
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Ditremaster Covazi Sea Urchin Fossil Bartonien Spain R

AU $13.12
End Date: Saturday Sep-12-2020 2:03:03 EST
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Gitolampas Neuvillei Sea Urchin Fossil Bartonien of / The 33 Az

AU $8.22
End Date: Friday Sep-11-2020 17:00:04 EST
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