Strongyloides stercoralis

Strongyloides stercoralis. Parasitic adult female (unstained, low power). The parasitic female lives threaded into the mucosal epithelium of the human small intestine. There is no parasitic male; females reproduce by parthenogenesis. In contrast to the free-living adults, the female is very small (2.1-2.7 mm), slender, and filariform, with a short, pointed tail. Parasitic females are rarely seen in feces.