Timema knulli, Redwood (IMAGE) Utah State University Caption Stick insects, Timema knulli, on a Redwood tree branch. Utah State University evolutionary geneticist Zach Gompert and colleagues studied a chromosomal inversion in the species and report findings in the June 12, 2023, online edition of PNAS. Credit Moritz Muschick Usage Restrictions Credit Author License Original 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.