Pulex irritans

​Distinguishing Features: Genal and pronotal combs absent;  Front margin of head rounded;  Thorax not contracted;  Mesopleurone not divided by vertical thickening;  Ocular bristle inserted below eye;  Shape of spermatheca (1)

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Pulex simulans

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Sources:
(1) Zajac, Anne M., and Gary A. Conboy. Veterinary Clinical Parasitology. 8th ed., Wiley Blackwell, 2013.