Taxonomy: s.f. Ancylostomatoidea
Animal: Ancylostoma caninum 3 17.jpg
Ancylostoma caninum male adult (Dog hook worm). 10 x 0.4 mm Different from Ancylostoma duodenale in that it has 3 pairs of ventral teeth cf Ancylostoma duodenale which has 2 pairs of ventral teeth. The copulatory bursa is similar to that of Ancylostoma duodenale but the rays are thiner and longer and the spicules less than 1 mm are less than half as long. Normal host is the dog but this worm was found in a human in North Qld. Infective larvae found in moist warm soil can penetrate human skin but rarely penetrate further; they cause itching and irritation in the skin called creeping eruption. Occasionally, a larva has completed the cycle through the lungs and into the intestine of humans and developed into a mature adult causing eosinophilia and abdominal pain - a condition known as eosinophilic enteritis. (Croese, J. et al. 1994. Ann Intern. Med. 120: 369-374.) Fix nematodes in 10 percent formalin. To examine: small nematodes can be mounted in glycerine or glycerine jelly ringed with nail polish or chlorlactophenol or dehydrated, cleared and mounted as permanent preparations.
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