portrait

Description:

Thecamoeba (theek-a-me-ba) a naked amoeba, in which the surface seems relatively thick and stiff and is often thrown into folds (not visible here). Hyaline regions are the clear areas upper left and right. Phase contrast. Material from Nymph Creek and Nymph Lake, thermal sites in Yellowstone National Park, photograph by Kathy Sheehan and David Patterson.