ShellSanibel
Read the beach.
Florida fighting conch
Strombus alatus
common · 2–4 in (5–10 cm)
How to tell it
Heavy for its size, squat, with a flared lip and a row of blunt shoulder knobs. Colour runs from orange-brown to deep mahogany.
What it gets confused with
Juvenile shells lack the flared lip entirely and are easy to take for something else — a small, plain, heavy spiral. The West Indian fighting conch is the shell most often set against this one, though whether the two are separate species is exactly the point in dispute below.
Where it turns up
Washed up in numbers after a storm, especially the Gulf beaches at the island’s east end.
Alive or empty
Very often alive, which is the single most important thing on this page. They arrive in rafts and a great many of them still contain the animal. If it is heavy, sealed, or you can see a claw-like operculum, put it back in the water.
Worth knowing
Named for the way it hauls itself along and jabs with its operculum, not for any aggression toward you.
A note on the name
The World Register of Marine Species currently treats Strombus alatus as a junior synonym of Strombus pugilis, the West Indian fighting conch — that is, it considers them one species. Not everyone agrees, and Gulf references generally keep them separate. This guide uses the name you will find locally and leaves the question open rather than pretending it is settled.
Taking live shells is prohibited in Lee County
That includes anything with the animal still in it, and sand dollars, sea stars and urchins whether or not they look alive. If it moves, if it closes, if it is anchored to the sand — put it back where you found it, the right way up.
A shell with an animal in it is not a souvenir that has been left out. It is the animal’s house, and the beach is not producing spares.