The Black Mystery Snail is one of about 120 species belonging to the Ampullariidae family. The Ampullariidae family name is also sometimes referred to as Pilidae. The most visible characteristic of snails belonging to the Pomacea genus is the siphon. When needed, this siphon will extend out to the water surface allowing the snail to breathe while submerged. The siphon in this genus is typically longer than the length of the snail's body.