rhabditiform larva of Rhabdias ranae from Rana pipiens.  This ubiquitous nematode is readily available in leopard frogs.  This larva is found in the rectum, while the parasitic adult is found in the lungs.  The life cycle largely parallels that of Strongyloides stercoralis. The stain is the Bauer-Feulgen technique specific for glycogen.  40x.