Near Johnston Atoll, researchers examined wood lying about 2,400 meters below the ocean surface and found a minute limpet attached to it. Study of the shell and anatomy showed that the animal represented a new species, named Pectinodonta nautilus.

Sunken wood is a temporary island of food and structure on the deep seafloor. Microbes begin breaking it down, and specialized animals arrive to graze, bore, shelter, and feed within the small ecosystem. Wood-associated limpets can reveal how organisms find and divide resources that are scattered across a vast, dark habitat. The new species adds another participant to that succession.

Its known address remains narrow. The description came from material collected on one expedition and at one site, so the full range of Pectinodonta nautilus is not yet established. That narrow known address is also a reminder that even a fallen branch can become unexplored terrain after sinking far enough. The log reached the deep sea; the limpet made it a world.