Toxocara Canis Werner (1782) (Nematoda) From the Dog, Canis familiaris (Canidae): A Light and Scanning Electron Microscopic Stu

Document Type : Original Article

Authors

1 Zoology Department, Faculty of Science, Cairo University, Cairo, Egypt

2 Zoology Department, Faculty of Science, Minia University, Minya, Egypt

3 -Zoology Department, Faculty of Science, Cairo University, Cairo, Egypt -Biology Department, Faculty of Science, King Khalid University, Saudi Arabia

4 Zoology Department, Faculty of Science, South Valley University, Qena, Egypt

Abstract

Toxocara canis is one of the most prevalent and pathogenic gastrointestinal nematodes infecting dogs. The present study aimed for the description of this nematode isolated from the dog, Canis familiaris (Canidae) based on light and scanning electron microscopy. The recovered worms were long and yellow by naked eyes. Light and SEM observations showed that the anterior ends of both sexes constitute mouth and buccal capsule, which were surrounded by three well-defined interlocked lips, distinctly offset from the anterior end, one dorsal, and two laterals, the dorsal lip swollen with narrowed dentigerous ridges bordered the outer margin of the internal surface. Two fine cuticular pits were seen on the apex of the external surface of the apical part of the lips with narrow cervical alae that tapered gradually, merged into the cuticle, giving the anterior end a lancet-like appearance. The cuticle is transversely annulated.Male worms 19-31 (24.2± 1) mm long x 0.48-0.62 (0.51± 0.3) mm wide. The posterior end equipped by 32 pairs of papillae. Females long measured 33-42 (35.1± 1) mm long x 0.55-1.33 (0.9±0.02) mm wide. Semicircular anal opening at conical posterior end with no anal lips nor papillae were observed. 

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