3-D scans of fossils suggest new fish family tree

Analysis of specimens from China implies ray-finned fishes are younger than previously thought

Polypterus

PRIMITIVE FISH  Polypterus (shown) is a living member of a large group of vertebrates called ray-finned fishes. New evidence suggests that ray-finned fishes arose about 360 million years ago, after a major extinction event, then their diversity exploded.

Matt Friedman/Univ. of Michigan

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