Anatrichosoma infection in two white-handed gibbons.

Multiple nodular lesions of the nematode Anatrichosoma were observed on the ears, lips, nares, and eyelids of 2 adult gibbons (Hylobates lar). The lesions were 4 to 7 mm in diameter, gray to pink, and firm on palpation. Microscopically, the nodules consisted of thickened epidermis having intraepidermal cysts containing the nematode and eggs. Live female nematodes were recovered from fresh biopsy specimens. Because male specimens were not obtained, the species could not be identified.