👉 A leptodactylus is a type of skeletal abnormality that results in two or more arms and legs. In humans, it can be caused by a genetic mutation or by a birth defect. The term "leptodactylus" comes from the Greek word for two legs, as if they were joined together at the waist. It's often used to describe a person who has two arms and one leg, which is not normal in humans.