Paleomerus

Paleomerus is a genus of strabopid, an extinct group of arthropods, known from two species, P. hamiltoni from Sweden and P. makowskii from Poland, both recovered from Lower Cambrian deposits of the Atdabanian epoch, about 520 to 516 million years ago. Ranging from about 7.3 to 9.3 centimeters long, it had a short head bearing compound eyes, a segmented body with eleven abdominal segments, and a thick spine like telson, with a flexible body plan that let it swim and roll. As one of the oldest known arthropods, it is regarded as a possible early model for the arachnomorph body plan.