University of Alberta

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  1. The first three images show a normal engorged male Dermacentor andersoni on the left, a normal engorged female on the right and an engorged gynandromorph in the middle.
  2. The fourth image is of a newly moulted Amblyomma hebraeum female.
  3. The fifth image shows an engorged Amblyomma hebraeum female laying eggs. The three dorsal white “stripes” are Malpighian tubules packed with white crystals of the nitrogenous waste product, guanine.
  4. The last image is of an engorged Amblyomma hebraeum female showing the superficial appearance of a conjoined twin. The effect is likely due to an anomaly in cuticular expansion in the posterior of the tick rather than to an embryonic defect.
Last Modified:2007-03-14