Spearers, 1-7 inches, occur from Maine to South America - particularly common on mud bottoms from Virginia to Texas, often caught in shrimp trawls, found from low intertidal to more than 40 m. They burrow, eat mostly crustaceans, annelids and thin shelled bivalves, are nocturnal, and do reasonably well in an aquarium - although I rarely can keep them longer than a few months. There are more than a dozen species of Squilla and several other squillids in the western Atlantic and identification is tricky, so it is probably risky to assume that any squillid caught is S. empusa.