Abstract: What paleontologists long believed were long spines on the aptly named Alienacanthus turn out to be an extended lower jaw.
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Some 375 million years ago, armored fishes ruled a watery world. Known as placoderms, these primitive jawed vertebrates came in all shapes and sizes, from small bottom-dwellers to giant filter-feeders. Some, like the wrecking-ball-shaped Dunkleosteus, were among the ocean’s earliest apex predators.
Source: The New York Times
Category: Science
Sub Category:
2024-01-31T00:01:08+0000
By Jack Tamisiea