Figure 1
From: Cryptic diversity in a gastrointestinal acanthocephalan of New World primates from Costa Rica
Macroscopic and microscopic findings of intestinal lesions induced by P. elegans in S. o. citrinellus. (a) Extraction of an adult specimen during intestinal surgery. (b) Macroscopic appearance of the large bowel showing enlarged lymph nodes (yellow arrowheads) and nodules induced by the worms (green arrowheads). (c) Histopathological staining of P. elegans worms penetrating the intestinal muscular wall and inducing a severe pyogranulomatous reaction (Bar: 1.5 mm). (d) Inflammatory foci in the outer muscle layer and serosa of the intestine consisting of degenerated parasites surrounded by macrophages, neutrophils, eosinophils, fibroblasts and lymphocytes (Bar: 1.7 mm).
