Softshell Turtle Apalone spinifera (IMAGE) Iowa State University Caption The species of turtle involved in the study is Apalone spinifera, a species of freshwater turtles native to North America. But the researchers say their findings shed light on the evolutionary role of sex chromosome dosage compensation in many species. Credit Nicole Valenzuela 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.