Alimentary tracts of freshly sampled animals. (A) C. elegans late L3 larva, freshly isolated from a rotting apple (#7) in Santeuil, with bacteria and yeast in the intestinal lumen. (B) C. elegans adult in the same sample, with empty fungal cell walls in the intestinal lumen. (C). C. elegans adult freshly isolated from a rotting apple (O145) from Orsay. (D) C. briggsae adult in a rotting peach from Le Blanc. (E, F) C. briggsae adults in a rotting apple (O635) from Orsay, showing bacterial proliferation in the intestinal lumen, with total obstruction in (F). (G) C. elegans adult in a rotting Arum stem from Plougasnou, with defects in feeding, accumulating bacteria in the pharyngeal lumen. The posterior pharyngeal bulb is visible in (E-G). The ventral side of the animals is down in all pictures.