The external and internal morphology was studied under a stereomicroscope and using a full-frame digital camera (Nikon D-810). The buccal mass of each specimen was extracted and processed in 10% sodium hypochlorite solution to extract the radula and the jaws. The jaws of each species were analysed under a stereomicroscope and then photographed. The radulae were coated and examined and photographed using a scanning electron microscope (CamScan). The reproductive systems were also examined using the stereomicroscope.