Florida's State Shell, the Horse Conch (Triplofusus giganteus (Kiener, 1840)), is by far the most imposing of all the state shells, and may attain a length of 24 inches. The species, a voracious carnivore, is common on both coasts of Florida from the shoreline down to a depth of about 100 feet. Although the shell is found throughout the southeast United States, in Texas, and northeast Mexico, it is much more common in Florida waters. Does your state have a shell? Check here.