1. Fleas.
Fleas. (A) Ctenocephalides felis. (B) C. canis. (C) Xenopsylla cheopis. (D) C. felis (closeup of head). (E) C. canis (closeup of head). (F) X. cheopis (closeup of head) (arrow, divided mesopleuron). (G) Pulex irritans. (H) P. irritans (closeup of head). (I) Tunga penetrans excised from a lesion (arrow, egg). (Panels A to H are courtesy of the Parasite and Disease Image Library [PaDIL], Melbourne, Australia, published under a Creative Commons license; panel I courtesy of the CDC-DPDx.)‏
Blaine A. Mathison, and Bobbi S. Pritt Clin. Microbiol. Rev. 2014; doi: /CMR