The parasite was 4 mm long and 0.25 mm wide. It could be seen under an optical microscope that there were four small hooks on the head, and the number of small hooks in each circle gradually increased from front to back. From the back view of the header, it could be seen that the first row of small hooks was smaller, and the other three rows were almost the same size. There were horizontal stripes on the surface of the worm body after the head hook, and a ring of small spines was arranged along with the horizontal stripes. The small spines were arranged densely and largely in the front part of the body, and gradually became smaller and thinner from the back to the back part. In the internal structure of the worm, a rod-shaped oesophagus could be seen, which was connected to the thick intestine. The intestinal epithelial cells were cylindrical with multiple nuclei. There were four obvious tubular neck capsules in the front 1/4 of the body, which opened on the head ball. The tail end was conical. The morphological characteristics of the worms accorded with the characteristics of the third-stage larvae of G. spinigerum.