Bathymodiolid mussels and vestimentiferan tube worms, collected from a methane seep off the coast of Costa Rica, provide habitat for many associated species including the gastropods seen in this picture. Many large limpets live on the tubes and shells, where they graze on bacteria and other microbes.

These bathymodiolid mussels and vestimentiferan tube worms were collected from a methane seep off the coast of Costa Rica. They provide habitat for many associated species, including the gastropods seen in this picture. Many large limpets live on the tubes and shells, where they graze on bacteria and other microbes. Photo courtesy of Benjamin Grupe.

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