Ancient, humble critter proves: Newer isn’t always better

Tiny sea creatures called rhabdopleurids reside on the ocean floor, building homes of collagen on the shells of dead clams. Rhabdopleurid colonies are small, and the critters are by no means the dominant animals in their ecosystem. But they have lived this way -- and survived -- for more than 500 million years. And in doing so, they have outlasted more elaborate species that also descended from a common ancestor, according to a new study.

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