Fig. 1

Images of micro-CT scans of Oedothorax gibbosus, with central nervous system (yellow), venom glands (red), muscles (light blue), digestive system (green), unknown amorphous tissues (dark blue) and male specific epidermal glands (purple). Interactive 3D images are available in the Additional File 3. Click on the image to activate individual 3D model; to hide/show different structures, right-click and select “show model tree”. a, c, e show the structures on both sides, while b, d, f show only the right side. a, b female. c, d male, gibbosus morph. e, f male, tuberosus morph