Astraspis was one of only a few fish species prior to Earth's first mass extinction 450 million years ago. This tiny fish had something never before seen on Earth: a primitive backbone.
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Animal Armageddon: Astraspis
Astraspis was one of only a few fish species prior to Earth's first mass extinction 450 million years ago. This tiny fish had something never before seen on Earth: a primitive backbone.
Added: Feb 13, 2009
Views: 22766 Views
Runtime: 01:40
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