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Image Gallery: A Worm Missing Link

Spartobranchus tenuis

Spartobranchus tenuis in a tube

(Image credit: JB Caron)

Spartobranchus tenuis in a circular tube.

Worm Cluster

Clusters of Spartobranchus tenuis fossils.

(Image credit: JB Caron, image courtesy of the Smithsonian Institution)

Clusters of Spartobranchus tenuis. Researchers analyzed more than 9,000 fossil specimens of the worms.