K. H. KJELDSEN / SCIENCE PHOTO LIBRARY K. H. KJELDSEN / SCIENCE PHOTO LIBRARY
Flea penis. Coloured scanning electron micrograph (SEM) of the posterior end of an unidentified male flea, showing its penis. The penis is the long hair-like structure at centre. Fleas (order: Siphonaptera) are small, wingless, blood-sucking insects that parasitize a variety of mammals including humans. They visit the host only to feed, spending most of their lives hidden on the ground in the host's home. Some fleas transmit infectious diseases, such as the rat flea which carries bubonic plague bacteria. Magnification unknown.
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