Plate IV – Onchocerca gibsoni Published on September 20, 2016 at 1156 × 1600 in Art and science under the microscope « Previous Next » Plate IV – Onchocerca gibsoni – Figures 9-18 Developmental stages of larvae. Drawn using an Abbe drawing apparatus. 1/12 oil immersion Occular 14. By Gladys Roberts, Institute of Tropical Medicine, Townsville, 1911.