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The occurrence of the pentastomid Porocephalus crotali in an Indian rat snake (Ptyas mucosus) at Chennai, India is reported. The worms were found in the lungs and they were identified as females. The worms were cylindrical and annulated with a centrally located mouth surrounded by four hooks. The worms were rounded in cross section with tapering ends. Eggs were composed of two shell membranes. This...
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