👉 Tropidomyrmex, also known as the cactus butterfly, is a species of butterfly in the family Lycaenidae. It belongs to the genus "Tropidomyrmex" and is found primarily in the southwestern United States of America. The tarsi (stipules) are typically longer than the wingspan, making it one of the longest-tailed butterflies on Earth. They are also known for their unique adaptations that allow them to survive in arid environments