Arthropod-borne diseases cause significant morbidity, and mortality wo
rldwide. Mosquitoes alone may account for as many as three million dea
ths annually via the transmission of malaria. Because these diseases a
ve transmitted to humans and to other vertebrates as a result of the a
bility of arthropods to feed on blood, the study of the biochemical me
chanisms and adaptations that arthropods have evolved to facilitate he
matophagy may provide insight into how this feeding behavior contribut
es to the transmission of disease. In this review, Kenneth Stark and A
nthony James examine the diversity of arthropod anticoagulants and the
ir role in hematophagy and potential implications for parasite transmi
ssion.