Lone Star Tick (IMAGE) Washington University in St. Louis Caption A. americanum, known as the lone star tick because adult females sport a star on their backs, has recently been shown to be the vector for several new diseases. Credit US Centers for Disease Control Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.