or early fourth-stage larvae measure anywhere from 17 to 50 millimeters
in length, 1 to 2 millimeters in diameter. Characteristic features
include large anterior excretory gland cells, a ventriculus between
the esophagus and the intestine, three lips, a small anterior boring
tooth, prominent Y-shaped lateral chords, and a spinelike structure
(a mucron) at the anterior end.
of Anisakis species tend to be pink and tightly coiled in the
flesh of the fish; the larvae of Pseudoterranova tend to be
yellow-brown to brown and are loosely coiled.
Larvae isolated from a patient
Figure 1: Larvae is 25 mm long,
0.7 mm in diameter. This figure clearly shows the transverse
cuticular striations on the lateral side of the larvae.
Figure 2: The anterior part
of the larvae presents prominent lips.
Figure 3: Posterior view of
Transverse section through the body
of A. simplex shows a large, Y-shaped lateral chord (LC)
Link to Case