Scanning Electron Microscopy of the Labia of Baylisascaris procyonis (Nematoda)

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Abstract
The labial organization of adult B. procyonis, as studied by scanning electron microscopy, was similar for males and females. The apical part of each lip was smooth and the basal part reticulated. The dorsal lip had 2 dorsolateral double papillae and 2 internal labial papillae; the 2 subventral lips each had 1 ventrolateral double and 1 externolateral papilla, 2 internal labial papillae and an amphid. The small papilla of each double set was dome-shaped and smooth, whereas, the large papilla was broad and had a prominent central pore. The externolateral papillae had raised, highly sculptured surfaces with numerous slits and creases present. Amphids resembled those of previously studied nematodes. The internal labial papillae consisted of pits. Denticles arose as a single row from the apical edge of the inner labial surface, were usually evenly spaced, and pyramidal or conoidal in shape. They were typically unicuspid, but bicuspid denticles occasionally were seen. Denticle shape and size varied between specimens and on each specimen. A pit was seen in the cuticle in the central region of the denticular row of all lips. Several of these findings represent new information concerning ascaridoid nematodes.

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