Habelia optata on Tree of Life (image) University of Toronto Share Print E-Mail Caption Simplified phylogeny (tree of life) showing the relationship of Habelia with other groups of arthropods. A new study by paleontologists at the University of Toronto and the Royal Ontario Museum shows that it is an early relative of chelicerates -- a group including spiders, scorpions, horseshoe crabs and mites. Credit Cedric Aria Usage Restrictions None Share Print E-Mail 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.