Ram’s horn shell

Mollusca – Cephalopoda


The ram’s horn shell is actually the spiral internal skeleton of a small squid-like animal, Spirula spirula, that lives in the deep open ocean. The shell, divided into small gas-filled chambers, helps the Spirula to move up to the ocean surface at night.

Did you know?

When the animal dies, the shell floats to the surface and often becomes a raft on which other creatures, such as goose barnacles, attach themselves.